$168+ 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 13/12. 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
2 Dec — 9 Dec1
1 adult
1 adult, Economy, 0 bags

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 2 November 2025.

Cheapest airline

United Airlines

Good round-trip deal

$107 or less
On average, United Airlines currently has the cheapest one-way flight from Lambert-St Louis (avg. price of $2,504).
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Price to beat on a round-trip flight from Lambert-St Louis.
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Find flights from St. Louis

Enter your travel dates to find the best prices.

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 2 November 2025.

Wed 11/214:45STL - BNE
2 stops26h 00mMultiple Airlines
Wed 18/210:45BNE - STL
2 stops44h 44mMultiple Airlines
Deal found 1/11$1,488
Sat 24/116:05STL - BNE
2 stops48h 40mAir Canada
Sat 31/110:45BNE - STL
2 stops44h 44mAir Canada
Deal found 31/10$1,491
Mon 16/214:45STL - BNE
2 stops26h 00mMultiple Airlines
Tue 10/305:05BNE - STL
3 stops49h 24mMultiple Airlines
Deal found 1/11$1,523
Thu 12/206:30STL - SYD
1 stop33h 30mQantas Airways
Tue 17/207:05SYD - STL
2 stops33h 43mQantas Airways
Deal found 1/11$1,621
Fri 14/1107:00STL - BNE
1 stop30h 00mAmerican Airlines
Mon 24/1119:40BNE - STL
1 stop20h 02mAmerican Airlines
Deal found 31/10$1,627
Sat 22/1116:43STL - BNE
2 stops48h 02mAir Canada
Fri 26/1210:45BNE - STL
2 stops27h 37mAir Canada
Deal found 31/10$1,636
Thu 19/317:59STL - SYD
2 stops34h 51mQantas Airways
Thu 2/418:45SYD - STL
1 stop20h 24mQantas Airways
Deal found 31/10$1,651
Thu 29/107:04STL - SYD
1 stop32h 56mQantas Airways
Wed 18/217:50SYD - STL
2 stops38h 14mQantas Airways
Deal found 31/10$1,656
Sat 22/1116:43STL - BNE
2 stops24h 02mMultiple Airlines
Fri 26/1210:45BNE - STL
2 stops44h 44mMultiple Airlines
Deal found 1/11$1,671
Mon 16/214:45STL - BNE
2 stops26h 00mAir Canada
Fri 20/210:45BNE - STL
2 stops44h 44mAir Canada
Deal found 1/11$1,686
Tue 25/1107:00STL - MEL
1 stop33h 30mQantas Airways
Tue 2/1218:30MEL - STL
2 stops39h 04mQantas Airways
Deal found 1/11$1,688
Tue 10/317:59STL - SYD
2 stops45h 36mQantas Airways
Wed 25/311:20SYD - STL
1 stop27h 49mQantas Airways
Deal found 1/11$1,691

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 2 November 2025. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 11/2

14:45-08:45

2 stops26h 00m

Brisbane

Wed 18/2

10:45-15:29

2 stops44h 44m

$1,488

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 16/2

14:45-08:45

2 stops26h 00m

Brisbane

Tue 10/3

05:05-15:29

3 stops49h 24m

$1,523

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 16/2

18:50-17:10

2 stops30h 20m

Brisbane

Tue 10/3

19:40-23:09

1 stop18h 29m

$1,634

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 22/11

16:43-08:45

2 stops24h 02m

Brisbane

Fri 26/12

10:45-15:29

2 stops44h 44m

$1,671

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 16/2

14:45-08:45

2 stops26h 00m

Brisbane

Fri 20/2

10:45-15:29

2 stops44h 44m

$1,686

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 22/11

17:29-07:30

1 stop22h 01m

Brisbane

Fri 26/12

11:40-22:30

1 stop26h 50m

$1,737

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 29/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 6/12

19:15-12:34

2 stops34h 19m

$1,822

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/3

16:05-08:35

2 stops48h 30m

Sydney Kingsford Smith

Wed 25/3

10:20-16:52

2 stops46h 32m

$1,868

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

07:00-20:50

2 stops44h 50m

Sydney Kingsford Smith

Sun 14/12

14:05-17:05

1 stop20h 00m

$1,897

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/3

16:35-07:00

1 stop22h 25m

Sydney Kingsford Smith

Sun 22/3

11:50-15:54

1 stop20h 04m

$1,931

Flights are sorted by cheapest return flights first.

Deals found on 31/10

Showing 1-10 of 40 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 31 October 2025.

The best time to book flights from St. Louis is 57 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 $1,058). Flying from St. Louis in February will prove the most costly (average of $1,940). 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 (382 flights per day), Atlanta (103 flights per day) and Detroit (88 flights per day).

Denver Intl
Denver Intl
From $106

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 $106. Explore other affordable destinations below.

Denver Intl
Denver Intl
From $106

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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 2 November 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 Denver, Cancún, Atlanta. Denver, Cancún, 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 $106 to Denver (prices may vary depending on the airline and departure time). On average, users have booked flights for $107 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 Houston George Bush Intcntl Airport starting at $5,654

  • 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 February. 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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