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$296+ Cheap flights from St. Louis

This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — SYD
6 May — 13 May1
1 adult

What to know about flights from St. Louis

Discover essential information about flights departing from St. Louis, including flight schedules, destinations, airlines operating at the St. Louis airport, and any specific guidelines or requirements for travellers. Please note that the information is based on the most recent updates available. Data last updated 1 May 2025.

Cheapest airline

United Airlines

Good round-trip deal

$2,370 or less

Good one-way deal

$418 or less
On average, United Airlines currently has the cheapest one-way flight from Lambert-St Louis (avg. price of $2,572).
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Price to beat on a round-trip flight from Lambert-St Louis.
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Price to beat on a one-way flight from Lambert-St Louis.
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Find flights from St. Louis

Cheapest flights from St. Louis
Explore the most affordable flight options available from St. Louis. Find the lowest fares based on data from user searches, with prices last updated on 1 May 2025.

Sat 5/715:08STL - SYD
2 stops29h 37mMultiple Airlines
Sat 16/813:45SYD - STL
2 stops23h 45mMultiple Airlines
Deal found 1/5$1,925
Mon 20/1017:43STL - MEL
2 stops25h 07mAir New Zealand
Wed 29/1012:05MEL - STL
2 stops24h 16mAir New Zealand
Deal found 1/5$1,979
Wed 20/811:05STL - SYD
2 stops32h 30mAir New Zealand
Wed 3/911:50SYD - STL
2 stops25h 26mAir New Zealand
Deal found 1/5$1,982
Sun 1/606:52STL - SYD
1 stop33h 13mAmerican Airlines
Sun 15/617:45SYD - STL
1 stop20h 14mAmerican Airlines
Deal found 1/5$2,081
Wed 20/817:49STL - SYD
1 stop22h 06mUnited Airlines
Wed 3/910:20SYD - STL
1 stop21h 33mUnited Airlines
Deal found 1/5$2,125
Fri 3/1013:30STL - SYD
2 stops26h 05mDelta
Fri 17/1010:25SYD - STL
2 stops29h 14mDelta
Deal found 30/4$2,147
Thu 23/1008:27STL - BNE
2 stops32h 18mAir New Zealand
Fri 7/1111:10BNE - STL
2 stops29h 17mAir New Zealand
Deal found 30/4$2,242
Mon 20/1016:12STL - MEL
1 stop20h 48mQantas Airways
Wed 29/1012:00MEL - STL
1 stop26h 53mQantas Airways
Deal found 1/5$2,250
Mon 20/1013:39STL - MEL
2 stops26h 51mUnited Airlines
Wed 29/1012:00MEL - STL
1 stop21h 03mUnited Airlines
Deal found 1/5$2,278
Mon 20/1009:15STL - MEL
3 stops34h 55mMultiple Airlines
Wed 29/1007:00MEL - STL
3 stops48h 26mMultiple Airlines
Deal found 1/5$2,360
Thu 23/1007:00STL - BNE
1 stop31h 25mQantas Airways
Fri 7/1119:25BNE - STL
1 stop20h 32mQantas Airways
Deal found 30/4$2,422
Thu 23/1009:00STL - BNE
2 stops30h 30mUnited Airlines
Fri 7/1111:40BNE - STL
1 stop21h 23mUnited Airlines
Deal found 30/4$2,439

Find flights from St. Louis within your budget

Find flights departing from St. Louis that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 1 May 2025. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 5/7

15:08-11:45

2 stops29h 37m

Sydney Kingsford Smith

Sat 16/8

13:45-22:30

2 stops23h 45m

$1,925

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 20/10

17:43-10:50

2 stops25h 07m

Melbourne

Wed 29/10

12:05-20:21

2 stops24h 16m

$1,979

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/8

11:05-10:35

2 stops32h 30m

Sydney Kingsford Smith

Wed 3/9

11:50-22:16

2 stops25h 26m

$1,982

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/6

06:52-07:05

1 stop33h 13m

Sydney Kingsford Smith

Sun 15/6

17:45-22:59

1 stop20h 14m

$2,081

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/8

17:49-06:55

1 stop22h 06m

Sydney Kingsford Smith

Wed 3/9

10:20-16:53

1 stop21h 33m

$2,125

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 3/10

13:30-06:35

2 stops26h 05m

Sydney Kingsford Smith

Fri 17/10

10:25-23:39

2 stops29h 14m

$2,147

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Thu 23/10

08:27-07:45

2 stops32h 18m

Brisbane

Fri 7/11

11:10-00:27

2 stops29h 17m

$2,242

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 20/10

16:12-05:00

1 stop20h 48m

Melbourne

Wed 29/10

12:00-22:53

1 stop26h 53m

$2,250

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 20/10

13:39-08:30

2 stops26h 51m

Melbourne

Wed 29/10

12:00-17:03

1 stop21h 03m

$2,278

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 20/10

09:15-12:10

3 stops34h 55m

Melbourne

Wed 29/10

07:00-15:26

3 stops48h 26m

$2,360

Flights are sorted by cheapest return flights first.

Deals found on 30/4

Showing 1-10 of 33 results
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Best time to book a flight from St. Louis

Have a flexible travel schedule? Discover the best time to fly from St. Louis 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 St. Louis

Get recent, data-driven insights about flights from St. Louis including ideal travel times, pricing trends, and more.

When is the best time to book a flight from St. Louis?

Use this chart to determine the optimal time to book a return flight from St. Louis to Sydney. Price data was last updated on 25 April 2025.

The best time to book flights from St. Louis is 83 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 St. Louis?

Currently, August is the cheapest month in which you can book a flight from St. Louis (average of $1,449). Flying from St. Louis in December will prove the most costly (average of $2,095). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

What are popular destinations to fly to from St. Louis?

St. Louis offers frequent flights to Chicago (626 flights per day), Detroit (198 flights per day) and Atlanta (178 flights per day).

Dallas/Fort Worth

Dallas/Fort Worth

From $677

Denver Intl

Denver Intl

From $267

San Francisco

San Francisco

From $1,581

What is the cheapest place to fly to from St. Louis?

The cheapest city to fly to from St. Louis is Denver Intl, with prices starting at $418. Explore other affordable destinations below.

Denver Intl

Denver Intl

From $267

Dallas/Fort Worth

Dallas/Fort Worth

From $677

San Francisco

San Francisco

From $1,581

Airline reviews for flights from St. Louis

Get insights into the airlines that provide service from St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing airline for your flight from St. Louis. In the last 7 days, Cheapflights users made a total of 647,157 searches.
ANA
8.3
Very Good
852 reviews
Check prices

Entertainment

7.9

Overall

8.3

Boarding

8.5

Food

7.6

Crew

8.7

Comfort

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
ANA
8.3
Very Good
852 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Entertainment

7.9

Overall

8.3

Boarding

8.5

Food

7.6

Crew

8.7

Comfort

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Alaska Airlines
8.0
Very Good
9,972 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Entertainment

7.9

Overall

8.3

Boarding

8.5

Food

7.6

Crew

8.7

Comfort

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Delta
8.0
Very Good
7,934 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Entertainment

7.9

Overall

8.3

Boarding

8.5

Food

7.6

Crew

8.7

Comfort

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Air New Zealand
8.0
Very Good
472 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Entertainment

7.9

Overall

8.3

Boarding

8.5

Food

7.6

Crew

8.7

Comfort

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Qantas Airways
7.5
Good
829 reviews
ANA
8.3
Very Good
852 reviews
Check prices

Entertainment

7.9

Overall

8.3

Boarding

8.5

Food

7.6

Crew

8.7

Comfort

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.

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Direct flights from Missouri

Book a direct flight from one of these other cities located in Missouri.
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Related info for your journey

Access useful and relevant information related to your journey from St. Louis. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 1 May 2025.

  • What are the most popular destinations to fly to from St. Louis?

    For the current month, the most popular flights from St. Louis are Cancún, Atlanta, Boston. Cancún, Boston, Atlanta are the most popular locations from St. Louis year round.

  • What is the cheapest flight from St. Louis to anywhere?

    Users have flown out of St. Louis for as low as $418 to Denver (prices may vary depending on the airline and departure time). On average, users have booked flights for $1,580 to fly from St. Louis.

  • What is the cheapest premium economy flight from St. Louis?

    Options for some of the cheapest premium economy flights from St. Louis we have found on Cheapflights are as follows:
    Fly from Lambert-St Louis to Denver starting at $1,450
    Fly from Lambert-St Louis to Houston George Bush Intcntl Airport starting at $6,529

  • What is the cheapest month to fly from St. Louis?

    Currently, the cheapest month for flights from St. Louis is August. The most expensive month for flights is December. The cheapest prices are shown above but prices will vary according to departure times, airlines, class and how early you book.

  • How does Cheapflights help users find flights from St. Louis?

    When you search for this flight from St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the best flight for you.

  • Why should you use Cheapflights to find cheap flight tickets from St. Louis?

    Cheapflights helps you find that perfect flight from St. Louis 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 St. Louis with no change fees?

    Yes, we can. To see specific flights from St. Louis with no change fees, users can toggle flexible booking options after using the search form above to find flights.

  • Can Cheapflights notify me if prices for flights from St. Louis become cheaper?

    Yes, Cheapflights offers price alerts on flights from St. Louis so you can book your travels when it’s right. The Price Alerts feature is available by clicking the bell icon next to the flight deals above and providing your email address.

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How does Cheapflights help users find flights from St. Louis?

When you search for this flight from St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the best flight for you.

Why should you use Cheapflights to find cheap flight tickets from St. Louis?

Cheapflights helps you find that perfect flight from St. Louis 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 St. Louis with no change fees?

Yes, we can. To see specific flights from St. Louis with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from St. Louis become cheaper?

Yes, Cheapflights offers price alerts on flights from St. Louis so you can book your travels when it’s right. The Price Alerts feature is available by clicking the bell icon next to the flight deals above and providing your email address.

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