What are the cheapest airlines flying from Boston to Sydney round-trip?

Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,292. Additional round-trip tickets that might be worth considering are offered by Air Canada and American Airlines, with the lowest prices starting at $1,301 and $1,312, respectively. United Airlines is 45% cheaper than the average price of flights available within the next 90 days to this destination. Find deals

What are the cheapest airlines to fly from Boston to Sydney one-way?

For one-way options, check prices for Air Canada. According to our data, you can fly for as low as $820. Users have also found prices from $1,088 and $1,126 on Qatar Airways and Etihad Airways, respectively. Find deals

What is the cheapest day to fly from Boston to Sydney?

Travellers seeking maximum savings on their Boston to Sydney flight should consider departing on Wednesday at midday when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly return from Boston to Sydney?

Thursday flights are found to be more expensive to fly from Boston to Sydney. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Sydney.

How far in advance should I book a flight from Boston to Sydney?

To save on the cost of your flight from Boston to Sydney, book at least 27 days before your planned departure. Booking around this time can save you about 17% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $1,966 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $2,059.

What is the cheapest month to fly from Boston to Sydney?

March is one of the best times of the year to fly to Sydney from Boston. Prices for March average $2,377 per person but you can even find prices for as low as $1,480. The most expensive prices can be found in the month of December. Opting for a March flight can save you 29% on your journey compared to booking in December

Can I find deals for flights from Boston to Sydney that include hotel bookings?

Yes. In addition to deals on Boston to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Boston to Sydney?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Sydney.

Can I find deals for business class flights from Boston to Sydney?

Yes. Cheapflights offers flight deals from Boston to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$820+ Flights from Boston to Sydney

The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in March or August, booked 26 days in advance, depart on a Tuesday or Saturday and return on a Sunday

Cheap flight deals from Boston to Sydney

Round-trip from	$1,292
One-way from	$820
Popular in	December
Cheapest in	March
Average price	$2,171

United Airlines
19/4-1/5
3 total stops
57h 30m total
Boston to Sydney

Search Deals

Air Canada
19/3
2 total stops
25h 55m total
Boston to Sydney

Search Deals

Highest demand for flights based on searches. 11% potential increase in price ($472 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($100 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2025

Search Deals

Find flight deals from Boston to Sydney

Cheapest flights from Boston to Sydney
Explore the most affordable flight options available from Boston to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Fri 22/810:20BOS - SYD

2 stops31h 00mAir Canada

Mon 1/909:20SYD - BOS

2 stops38h 15mAir Canada

Deal found 21/2$1,290

Sat 19/409:30BOS - SYD

2 stops31h 30mUnited Airlines

Mon 28/409:30SYD - BOS

1 stop21h 43mUnited Airlines

Deal found 20/2$1,292

Mon 3/316:04BOS - SYD

2 stops26h 16mAmerican Airlines

Tue 11/311:15SYD - BOS

2 stops24h 09mAmerican Airlines

Deal found 20/2$1,312

Wed 30/414:45BOS - SYD

1 stop25h 50mDelta

Wed 4/609:25SYD - BOS

1 stop28h 39mDelta

Deal found 19/2$1,358

Sat 22/301:30BOS - SYD

2 stops42h 15mMultiple Airlines

Fri 28/317:25SYD - BOS

1 stop27h 35mMultiple Airlines

Deal found 20/2$1,919

Best flights from Boston to Sydney
Discover carefully curated flight deals from Boston to Sydney that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 February 2025.

Sat 19/409:30BOS - SYD

2 stops31h 30mUnited Airlines

Thu 1/510:20SYD - BOS

1 stop26h 00mUnited Airlines

Deal found 20/2$1,292

Fri 11/410:50BOS - SYD

2 stops30h 30mAir Canada

Sat 19/409:20SYD - BOS

2 stops38h 21mAir Canada

Deal found 21/2$1,301

Mon 3/316:04BOS - SYD

2 stops26h 16mAmerican Airlines

Tue 11/311:15SYD - BOS

2 stops24h 09mAmerican Airlines

Deal found 20/2$1,312

Wed 30/415:00BOS - SYD

2 stops25h 35mDelta

Fri 30/509:25SYD - BOS

2 stops25h 05mDelta

Deal found 19/2$1,358

Sat 22/301:30BOS - SYD

2 stops42h 15mMultiple Airlines

Fri 28/317:25SYD - BOS

1 stop27h 35mMultiple Airlines

Deal found 20/2$1,919

Last-minute flights from Boston to Sydney
Discover last-minute flight deals from Boston to Sydney. Data last updated 21 February 2025 and is based on user searches.

Thu 20/207:00BOS - SYD

1 stop31h 50mDelta

Thu 27/211:05SYD - BOS

1 stop26h 16mDelta

Deal found 19/2$1,370

Thu 20/221:15BOS - SYD

1 stop29h 35mQatar Airways

Thu 6/321:40SYD - BOS

1 stop32h 15mQatar Airways

Deal found 20/2$2,508

Sun 23/219:59BOS - SYD

3 stops31h 46mAlaska Airlines

Fri 28/221:40SYD - BOS

2 stops35h 44mAlaska Airlines

Deal found 19/2$2,496

Mon 24/219:25BOS - SYD

2 stops46h 10mAir Canada

Mon 3/311:20SYD - BOS

3 stops45h 33mAir Canada

Deal found 20/2$1,395

Mon 24/218:00BOS - SYD

1 stop23h 00mQantas Airways

Wed 26/219:15SYD - BOS

2 stops35h 49mQantas Airways

Deal found 20/2$2,259

Thu 27/221:15BOS - SYD

1 stop29h 35mJetBlue

Mon 31/321:45SYD - BOS

1 stop32h 20mJetBlue

Deal found 20/2$2,560

Fri 28/218:00BOS - SYD

2 stops46h 20mAsiana Airlines

Wed 12/310:20SYD - BOS

2 stops35h 55mAsiana Airlines

Deal found 20/2$4,194

Sat 1/317:54BOS - SYD

1 stop23h 21mUnited Airlines

Tue 25/312:10SYD - BOS

2 stops26h 40mUnited Airlines

Deal found 21/2$1,292

Sun 2/309:45BOS - SYD

2 stops29h 05mDelta

Thu 13/313:15SYD - BOS

2 stops24h 14mDelta

Deal found 20/2$1,378

Sun 2/320:00BOS - SYD

2 stops31h 05mTurkish Airlines

Sun 9/321:00SYD - BOS

2 stops37h 05mTurkish Airlines

Deal found 20/2$2,361

Sun 2/319:59BOS - SYD

3 stops31h 46mAlaska Airlines

Sat 7/621:40SYD - BOS

2 stops35h 19mAlaska Airlines

Deal found 20/2$2,579

Mon 3/316:04BOS - SYD

2 stops26h 16mAmerican Airlines

Tue 11/311:15SYD - BOS

2 stops24h 09mAmerican Airlines

Deal found 20/2$1,312

One-way flights from Boston to Sydney
Search for one-way flight options from Boston to Sydney. Find affordable one-way fares based on user searches. Data last updated 21 February 2025.

Wed 19/315:40BOS - SYD

2 stops25h 55mAir Canada

Deal found 20/2$820

Mon 3/316:20BOS - SYD

3 stops49h 50mMultiple Airlines

Deal found 20/2$977

Mon 3/321:15BOS - SYD

1 stop29h 35mQatar Airways

Deal found 20/2$1,088

Tue 15/416:30BOS - SYD

1 stop35h 40mEtihad Airways

Deal found 20/2$1,126

Sun 6/421:45BOS - SYD

1 stop29h 25mJetBlue

Deal found 20/2$1,293

Sun 6/407:00BOS - SYD

2 stops46h 45mAlaska Airlines

Deal found 20/2$1,364

Sun 6/409:30BOS - SYD

3 stops31h 25mUnited Airlines

Deal found 20/2$1,508

Fri 25/716:49BOS - SYD

1 stop24h 06mAmerican Airlines

Deal found 19/2$1,588

Mon 17/301:30BOS - SYD

1 stop43h 30mCathay Pacific

Deal found 20/2$2,098

Sun 23/321:00BOS - SYD

2 stops31h 05mTurkish Airlines

Deal found 21/2$6,298

Sun 23/318:00BOS - SYD

1 stop24h 00mQantas Airways

Deal found 21/2$6,969

Find flights from Boston to Sydney within your budget

Fly from

Fly to

Route

Depart

Return

Price

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 19/4

09:30-07:00

2 stops31h 30m

Sydney Kingsford Smith

Mon 28/4

09:30-17:13

1 stop21h 43m

$1,292

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 11/4

10:50-07:20

2 stops30h 30m

Sydney Kingsford Smith

Sat 19/4

09:20-09:41

2 stops38h 21m

$1,301

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 3/3

16:04-10:20

2 stops26h 16m

Sydney Kingsford Smith

Tue 11/3

11:15-20:24

2 stops24h 09m

$1,312

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 30/4

14:45-06:35

1 stop25h 50m

Sydney Kingsford Smith

Wed 4/6

09:25-00:04

1 stop28h 39m

$1,358

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 22/3

01:30-10:45

2 stops42h 15m

Sydney Kingsford Smith

Fri 28/3

17:25-06:00

1 stop27h 35m

$1,919

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 19/3

15:40-08:35

2 stops25h 55m

$820

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 3/3

16:20-10:10

3 stops49h 50m

$977

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 3/3

21:15-18:50

1 stop29h 35m

$1,088

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 15/4

16:30-18:10

1 stop35h 40m

$1,126

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 6/4

21:45-17:10

1 stop29h 25m

$1,293

Flights are sorted by cheapest return flights first.

Deals found on 20/2

Showing 1-10 of 16 results

Best time to book a flight from Boston to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Boston with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Boston to Sydney

Get recent, data-driven insights about flights from Boston to Sydney including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Boston to Sydney?

The best time to book flights from Boston to Sydney is 26 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Boston to Sydney?

Currently, May is the cheapest month in which you can book a flight from Boston to Sydney (average of $129). Flying from Boston to Sydney in October is currently the most expensive (average of $171). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOS to SYD?

One of the essential ways to save on airfare from Boston to Sydney is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 32% on airfare.

Rainfall in Sydney by month

In terms of precipitation, rainfall in Sydney ranges from 50.0 - 130.0 inches per month. March is typically the wettest month, when rainfall can reach 130.0 mm. September is typically the driest time to visit Sydney when rainfall is around 50.0 mm.

Temperature in Sydney by month

If weather is an important factor for your trip to Sydney, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 11.0 C).

Reviews of airlines servicing Sydney

See what other customers who have flown with Alaska Airlines, Delta and Cathay Pacific from Boston to Sydney have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very Good

9,697 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines

8.0

Very Good

9,697 reviews

Alaska Airlines

8.0

Very Good

9,697 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta

8.0

Very Good

8,212 reviews

Alaska Airlines

8.0

Very Good

9,697 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Cathay Pacific

7.5

Good

820 reviews

Alaska Airlines

8.0

Very Good

9,697 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Qatar Airways

7.4

Good

3,609 reviews

Alaska Airlines

8.0

Very Good

9,697 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

JetBlue

7.4

Good

3,069 reviews

Alaska Airlines

8.0

Very Good

9,697 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

What are the cheapest airlines flying from Boston to Sydney round-trip?
Flying on United Airlines is currently your cheapest option to Sydney, with prices starting at $1,292. Additional round-trip tickets that might be worth considering are offered by Air Canada and American Airlines, with the lowest prices starting at $1,301 and $1,312, respectively. United Airlines is 45% cheaper than the average price of flights available within the next 90 days to this destination.
What are the cheapest airlines to fly from Boston to Sydney one-way?
For one-way options, check prices for Air Canada. According to our data, you can fly for as low as $820. Users have also found prices from $1,088 and $1,126 on Qatar Airways and Etihad Airways, respectively.
Can I find deals for flights from Boston to Sydney that include hotel bookings?
Yes. In addition to deals on Boston to Sydney flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Boston to Sydney?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Sydney.
Can I find deals for business class flights from Boston to Sydney?
Yes. Cheapflights offers flight deals from Boston to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Boston to Sydney?
Currently, May is the cheapest month in which you can book a flight from Boston to Sydney (average of $129). Flying from Boston to Sydney in October is currently the most expensive (average of $171). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Manly

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Lismore car hire

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Other flights to Sydney

Top 2 airlines flying from Boston to Sydney

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$1,735	Average$2,262	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Qantas Airways	Cheapest$2,148	Average$2,582	FlexibilityNo cancel fee	On-time74%	Search Qantas Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from Boston to Sydney?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Boston to Sydney. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Boston to Sydney?

Cheapflights helps you find that perfect flight to Sydney from Boston by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Boston to Sydney with no change fees?

Certainly. Search results for flights to Sydney from Boston shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Boston to Sydney become cheaper?

Of course! You can now track prices for flights from Boston to Sydney and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Boston to Sydney from $820

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/3. Fares are subject to change and may not be available on all flights or dates of travel.

The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in March or August, booked 26 days in advance, depart on a Tuesday or Saturday and return on a Sunday

Cheap flight deals from Boston to Sydney

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Boston to Sydney

Cheapest flights from Boston to SydneyExplore the most affordable flight options available from Boston to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Explore the most affordable flight options available from Boston to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Find flights from Boston to Sydney within your budget

Best time to book a flight from Boston to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Boston with our price prediction graph.

Travel insights for flights from Boston to Sydney

Get recent, data-driven insights about flights from Boston to Sydney including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Boston to Sydney?

Use this chart to determine the optimal time to book a return flight from Boston to Sydney. Price data was last updated on 14 February 2025.

What is the cheapest month to book a flight from Boston to Sydney?

What is the cheapest time of day to fly from BOS to SYD?

Find hourly flight availability from Boston to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 February 2025.

Rainfall in Sydney by month

Plan your trip to Sydney by taking into account the average rainfall totals by month.

Temperature in Sydney by month

Plan your trip to Sydney by taking into account the average temperature totals by month.

Reviews of airlines servicing Sydney

See what other customers who have flown with Alaska Airlines, Delta and Cathay Pacific from Boston to Sydney have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Boston to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Boston to Sydney round-trip?

What are the cheapest airlines to fly from Boston to Sydney one-way?

Can I find deals for flights from Boston to Sydney that include hotel bookings?

How can I find direct flights from Boston to Sydney?

Can I find deals for business class flights from Boston to Sydney?

What is the cheapest month to book a flight from Boston to Sydney?

Travelling to a place near Boston?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Sydney by adding a car hire and/or hotel booking to your travel itinerary.

Top 2 airlines flying from Boston to Sydney

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Boston to Sydney?

Why should you use Cheapflights to find cheap flight tickets from Boston to Sydney?

Can Cheapflights find flights from Boston to Sydney with no change fees?

Can Cheapflights notify me if prices for flights from Boston to Sydney become cheaper?

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Cheapest flights from Boston to Sydney
Explore the most affordable flight options available from Boston to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.