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Cheap flights from Boston to Sydney from $771

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 28/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SYD
20 Apr — 27 Apr1
1 adult

Cheapflights Tip: The best prices from Boston Logan Intl to Sydney Kingsford Smith are usually found in April or March, booked 62 days in advance, depart on a Tuesday or Saturday and return on a Sunday

Cheap flight deals from Boston to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 15 April 2025.

Round-trip from

$1,762

One-way from

$771

Popular in

December

Cheapest in

April

Average price

$2,005
5/6-18/6
  • 5/6-18/6
  • 2 total stops
  • 68h 20m total
  • Boston to Sydney
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28/5
  • 28/5
  • 3 total stops
  • 41h 40m total
  • Boston to Sydney
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($547 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease ($111 potential savings vs. average return price).
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Average for round-trip flights in April 2025
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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 15 April 2025.

Thu 5/608:00BOS - SYD
1 stop40h 40mMultiple Airlines
Wed 18/616:20SYD - BOS
1 stop27h 40mMultiple Airlines
Deal found 14/4$1,762
Sun 21/910:20BOS - SYD
2 stops31h 00mAir Canada
Sat 4/1010:20SYD - BOS
2 stops37h 15mAir Canada
Deal found 14/4$1,959
Tue 21/1018:19BOS - SYD
2 stops27h 26mFiji Airways
Thu 30/1014:15SYD - BOS
2 stops23h 54mFiji Airways
Deal found 13/4$2,134
Fri 22/817:15BOS - SYD
2 stops25h 30mAir New Zealand
Mon 1/909:55SYD - BOS
2 stops44h 43mAir New Zealand
Deal found 14/4$2,149
Tue 26/820:23BOS - SYD
2 stops33h 22mAlaska Airlines
Thu 11/921:40SYD - BOS
1 stop31h 37mAlaska Airlines
Deal found 14/4$2,161
Mon 20/1022:00BOS - SYD
1 stop29h 10mQatar Airways
Mon 27/1021:40SYD - BOS
1 stop32h 15mQatar Airways
Deal found 14/4$2,163
Sun 4/501:40BOS - SYD
1 stop43h 10mCathay Pacific
Mon 19/507:40SYD - BOS
1 stop29h 20mCathay Pacific
Deal found 14/4$2,191
Sun 11/521:35BOS - SYD
2 stops31h 25mTurkish Airlines
Fri 23/520:55SYD - BOS
2 stops36h 45mTurkish Airlines
Deal found 13/4$2,201
Sun 8/618:12BOS - SYD
1 stop22h 53mQantas Airways
Tue 17/609:10SYD - BOS
1 stop22h 06mQantas Airways
Deal found 14/4$2,294
Sun 8/614:54BOS - SYD
2 stops25h 11mAmerican Airlines
Tue 17/617:45SYD - BOS
1 stop26h 59mAmerican Airlines
Deal found 14/4$2,415
Sun 8/609:35BOS - SYD
2 stops31h 25mUnited Airlines
Sun 15/610:20SYD - BOS
3 stops33h 41mUnited Airlines
Deal found 14/4$2,461

Cheapflights Fare Finder

Customise your flight search to find flights from Boston to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 15 April 2025.
Use the filters below to find and compare flights from Boston to Sydney that are best for you.

Fly from

Boston

Fly to

Sydney

Route

Depart

Return

Price

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 5/6

08:00-14:40

1 stop40h 40m

Sydney Kingsford Smith

Wed 18/6

16:20-06:00

1 stop27h 40m

$1,762

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 21/9

10:20-07:20

2 stops31h 00m

Sydney Kingsford Smith

Sat 4/10

10:20-09:35

2 stops37h 15m

$1,959

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 22/8

17:15-08:45

2 stops25h 30m

Sydney Kingsford Smith

Mon 1/9

09:55-16:38

2 stops44h 43m

$2,149

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 26/8

20:23-19:45

2 stops33h 22m

Sydney Kingsford Smith

Thu 11/9

21:40-15:17

1 stop31h 37m

$2,161

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 10/6

18:17-11:45

2 stops27h 28m

Sydney Kingsford Smith

Tue 24/6

06:15-23:49

2 stops31h 34m

$2,164

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 21/9

22:00-06:15

1 stop42h 15m

Sydney Kingsford Smith

Sun 28/9

20:45-15:05

1 stop32h 20m

$2,179

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 4/5

01:40-10:50

1 stop43h 10m

Sydney Kingsford Smith

Mon 19/5

07:40-23:00

1 stop29h 20m

$2,191

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 11/5

21:35-19:00

2 stops31h 25m

Sydney Kingsford Smith

Fri 23/5

20:55-19:40

2 stops36h 45m

$2,201

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 8/6

18:12-07:05

1 stop22h 53m

Sydney Kingsford Smith

Tue 17/6

09:10-17:16

1 stop22h 06m

$2,294

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 4/5

22:00-17:10

1 stop29h 10m

Sydney Kingsford Smith

Sun 11/5

20:45-15:05

1 stop32h 20m

$2,332

Flights are sorted by cheapest return flights first.

Deals found on 15/4

Showing 1-10 of 27 results
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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.

Cheapflights Insights

Everything you need to know about your flight from Boston to Sydney

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 11 April 2025.

The best time to book flights from Boston to Sydney is 62 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?

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 15 April 2025.

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

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

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

Get insights into the airlines that provide service to Sydney. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sydney. Reviews last updated 15 April 2025.
See what other customers who have flown with Korean Air, Japan Airlines and Fiji Airways 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.
Korean Air
8.4
Very Good
1,063 reviews
Check prices

Crew

8.7

Boarding

8.5

Entertainment

8.2

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very Good
1,063 reviews
Korean Air
8.4
Very Good
1,063 reviews
Check prices

Crew

8.7

Boarding

8.5

Entertainment

8.2

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Japan Airlines
8.3
Very Good
1,440 reviews
Korean Air
8.4
Very Good
1,063 reviews
Check prices

Crew

8.7

Boarding

8.5

Entertainment

8.2

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Fiji Airways
8.0
Very Good
183 reviews
Korean Air
8.4
Very Good
1,063 reviews
Check prices

Crew

8.7

Boarding

8.5

Entertainment

8.2

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Delta
8.0
Very Good
7,916 reviews
Korean Air
8.4
Very Good
1,063 reviews
Check prices

Crew

8.7

Boarding

8.5

Entertainment

8.2

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Air New Zealand
8.0
Very Good
464 reviews
Korean Air
8.4
Very Good
1,063 reviews
Check prices

Crew

8.7

Boarding

8.5

Entertainment

8.2

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

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?

    Flying on Air Canada is currently your cheapest option to Sydney, with prices starting at $1,959. Additional round-trip tickets that might be worth considering are offered by Air New Zealand and Alaska Airlines, with the lowest prices starting at $2,149 and $2,161, respectively. Air Canada is 16% 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 Fiji Airways. According to our data, you can fly for as low as $1,037. Users have also found prices from $1,170 and $1,202 on Etihad Airways and Qatar 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

Travelling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Parramatta
Wollongong
Katoomba
Manly
Penrith
Coogee
Randwick
Terrigal
Cronulla
Lithgow
Bondi Beach
Leura
Swansea

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Boston to Sydney

Discover the top 3 airlines that operate flights from Boston to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 15 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$1,207Average$1,966FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest$1,291Average$2,031FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Qantas AirwaysCheapest$2,169Average$2,522FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights

Fly with Cheapflights

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

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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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