Which airlines fly to St. Louis?

Southwest is the airline most momondo users in United States opt for when booking flights to St. Louis. American Airlines, Delta and United Airlines are also popular choices when flying to St. Louis from United States. Most major airlines flying from United States to St. Louis will offer flights on a regular basis, though your options may vary depending on what airport you fly from.

How long does it take to fly to St. Louis?

Flight times from United States to St. Louis vary, but if you’re flying out of Los Angeles and flying into Lambert-St Louis (one of the most popular routes), then the duration is 3h 25m on average. Another popular route from United States to St. Louis is flying from Miami to Lambert-St Louis, which will take roughly 2h 55m. Keep in mind that layovers or delays could extend your travel time.

$20 Cheap Flights to St. Louis in 2025/26

Q: Southwest Flights to St. Louis

Southwest is a popular choice for users traveling to St. Louis. It operates 20 flights every week to St. Louis, most often flying from Las Vegas Harry Reid Intl. Southwest ticket prices will depend on when and where you need to fly from - deals as low as $177 (from Atlanta Hartsfield-Jackson) have been found by momondo users. In 4,244 reviews, momondo users have rated Southwest at an average score of 8.0/10.

Q: Alaska Airlines Flights to St. Louis

Alaska Airlines flight deals to St. Louis start from $257 - this is the best price found recently on momondo, and was a round-trip journey departing from Los Angeles. Over any normal week, Alaska Airlines flight prices are typically higher, but vary depending on where you fly from - Dallas/Fort Worth is the most popular Alaska Airlines departure point to St. Louis so generally has the most availability. Alaska Airlines is scored a 8.0/10 in 11,310 reviews.

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10:15 am - 11:07 amATL-STL

1h 52mnonstop

10:42 am - 1:27 pmSTL-ATL

1h 45mnonstop

$92Frontier

Find Deal

Thu, Dec 4 - Sun, Dec 7

8:55 am - 9:47 amATL-STL

1h 52mnonstop

3:30 pm - 9:41 pmSTL-ATL

5h 11m1 stop

$93Frontier

Find Deal

Fri, Dec 5 - Mon, Dec 8

2:54 pm - 4:34 pmDFW-STL

1h 40mnonstop

5:30 pm - 7:40 pmSTL-DFW

2h 10mnonstop

$149American Airlines

Find Deal

Sat, Dec 13 - Wed, Dec 17

9:45 am - 4:16 pmDCA-STL

7h 31m1 stop

8:41 am - 11:54 amSTL-DCA

2h 13mnonstop

$245American Airlines

Find Deal

Tue, Dec 2 - Sat, Dec 6

9:00 am - 10:50 amEWR-STL

2h 50mnonstop

6:35 pm - 12:26 amSTL-EWR

4h 51m1 stop

$251United Airlines

Find Deal

Tue, Dec 16 - Tue, Dec 23

6:00 am - 9:50 amIAD-STL

4h 50m1 stop

11:40 am - 5:00 pmSTL-IAD

4h 20m1 stop

$255Delta

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Tue, Dec 2 - Tue, Dec 9

1:42 pm - 6:33 pmDCA-STL

5h 51m1 stop

6:05 pm - 11:08 pmSTL-DCA

4h 03m1 stop

$255Delta

Find Deal

Tue, Dec 2 - Tue, Dec 9

8:15 am - 9:35 amDCA-STL

2h 20mnonstop

1:10 pm - 4:10 pmSTL-DCA

2h 00mnonstop

$263Southwest

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Thu, Dec 25 - Thu, Dec 25

8:00 am - 9:35 amDCA-STL

2h 35mnonstop

3:50 pm - 6:50 pmSTL-DCA

2h 00mnonstop

$265Southwest

Find Deal

Thu, Jan 22 - Sat, Jan 24

8:40 am - 10:13 amIAD-STL

2h 33mnonstop

8:30 am - 11:40 amSTL-IAD

2h 10mnonstop

$265United Airlines

Find Deal

Thu, Jan 22 - Sat, Jan 24

Fly from

Route

Depart

Return

Price

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Thu 12/4

10:15 am-11:07 am

Nonstop1h 52m

Lambert-St Louis

Sun 12/7

10:42 am-1:27 pm

Nonstop1h 45m

$92

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Fri 12/5

8:55 am-9:47 am

Nonstop1h 52m

Lambert-St Louis

Mon 12/8

3:30 pm-9:41 pm

1 stop5h 11m

$93

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Sat 12/13

2:54 pm-4:34 pm

Nonstop1h 40m

Lambert-St Louis

Wed 12/17

5:30 pm-7:40 pm

Nonstop2h 10m

$149

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/2

9:45 am-4:16 pm

1 stop7h 31m

Lambert-St Louis

Sat 12/6

8:41 am-11:54 am

Nonstop2h 13m

$245

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Tue 12/16

9:00 am-10:50 am

Nonstop2h 50m

Lambert-St Louis

Tue 12/23

6:35 pm-12:26 am

1 stop4h 51m

$251

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 12/2

6:00 am-9:50 am

1 stop4h 50m

Lambert-St Louis

Tue 12/9

11:40 am-5:00 pm

1 stop4h 20m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/2

1:42 pm-6:33 pm

1 stop5h 51m

Lambert-St Louis

Tue 12/9

6:05 pm-11:08 pm

1 stop4h 03m

$255

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 12/25

8:15 am-9:35 am

Nonstop2h 20m

Lambert-St Louis

Thu 12/25

1:10 pm-4:10 pm

Nonstop2h 00m

$263

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 1/22

8:00 am-9:35 am

Nonstop2h 35m

Lambert-St Louis

Sat 1/24

3:50 pm-6:50 pm

Nonstop2h 00m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 1/22

8:40 am-10:13 am

Nonstop2h 33m

Lambert-St Louis

Sat 1/24

8:30 am-11:40 am

Nonstop2h 10m

$265

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St. Louis flights insights and trends

Explore insights for your St. Louis flight to craft the best travel plan

Prices

Other information

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

In general, March is the cheapest month to fly from United States to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $300. The month of January is another great option to travel to St. Louis, with average flight prices from United States averaging around $305.

What is the absolute cheapest flight to St. Louis?

Users booking trips to St. Louis from Dallas found flights 38% cheaper than the average price of flights to St. Louis. To find the cheapest price to St. Louis from your area, use momondo’s Airport-to-Airport Pricing Tool.

See prices from:

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $319. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $439. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from United States in the morning is the least expensive time of day to depart. momondo users have found prices as low as $344 when looking at flights departing in the morning. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $377 per ticket.

Cheapest flights to Lambert-St Louis

Find the cheapest flights to Lambert-St Louis from your nearest city or airport

Find flights from Los Angeles to St. Louis

CHEAPEST MONTH TO FLY TO ST. LOUIS FROM LOS ANGELES	October	16% cheaper	Flying from Los Angeles to St. Louis costs on average just $336 in October
MOST EXPENSIVE MONTH TO FLY TO ST. LOUIS FROM LOS ANGELES	December	14% more expensive	It costs about $456 for flights to St. Louis from Los Angeles in December
MOST POPULAR MONTH TO FLY TO ST. LOUIS FROM LOS ANGELES	July	314% more users visited	More momondo users searched in flights to St. Louis from Los Angeles in July than any other month

Cheap St. Louis flight deals and tips

Summary info about St. Louis flight prices, duration and airlines

Best One-Way Price	$20
Best Round-Trip Price	$92
Fastest flight time	1h 45m
Popular in	November

The best one-way flight price to St. Louis from United States in the last 72 hours is $20 (Atlanta Hartsfield-Jackson to Lambert-St Louis).

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The best round-trip flight price to St. Louis from United States in the last 72 hours is $92 (Atlanta Hartsfield-Jackson to Lambert-St Louis).

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The fastest flight to St. Louis from United States takes 1h 45m (Atlanta Hartsfield-Jackson to Lambert-St Louis).

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November has the highest demand for flights to St. Louis, with a 17% price increase on average.

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Frequently asked questions about flying to St. Louis

How far in advance should I book a flight to St. Louis?

The best time to book a flight to St. Louis from United States is 79 days out, which is when prices tend to be around $338. In the past 72 hours, momondo users found flights from United States to St. Louis for as low as $222.

Is there an alternative airport near St. Louis?

Finding an alternative and possibly cheaper destination airport near St. Louis is possible. If you are planning a flight to St. Louis, consider booking flights to Belleville Airport (22 mi from St. Louis city center), Marion Williamson County Airport (88 mi from St. Louis city center) or Springfield Capital Airport (88 mi from St. Louis city center).

Is there a cheaper alternative to flying into St. Louis?

The cheapest airport near St. Louis is typically Marion Williamson County Airport with an average price of $191/person. These prices vary based on where travelers are coming from. It is suggested that travelers looking to save money try momondo’s Airport-to-Airport Pricing Tool.

When did momondo last update prices for flights to Lambert-St Louis Airport?

Prices for flights to Lambert-St Louis Airport are refreshed on a daily basis.

How many operators does momondo search for flights to Lambert-St Louis Airport?

There are 22 operators available for flights to Lambert-St Louis Airport as of November 2025.

How old do you have to be to fly to Lambert-St Louis Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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Chesterfield

Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Wentzville

Fenton

Collinsville

St. Peters

Alton

Farmington

Festus

Glencoe

Edwardsville

Clayton

Eureka

Litchfield

Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal to St. Louis?

It is quick and easy to find flights to St. Louis on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights to St. Louis?

Once all potential St. Louis flight options are in front of you momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight to St. Louis right now. Can momondo alert me if prices change?

Price alerts on flights to St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Lambert-St Louis trip

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$20 Cheap flights to St. Louis

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight to St. Louis departing on 12/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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St. Louis flights insights and trends

Explore insights for your St. Louis flight to craft the best travel plan

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

What is the absolute cheapest flight to St. Louis?

Users booking trips to St. Louis from Dallas found flights 38% cheaper than the average price of flights to St. Louis. To find the cheapest price to St. Louis from your area, use momondo’s Airport-to-Airport Pricing Tool.

See prices from:

What is the cheapest day to depart on your flight to St. Louis?

What is the cheapest time of day to depart on your flight to St. Louis?

How long does it take to fly to St. Louis?

Cheapest flights to Lambert-St Louis

Find the cheapest flights to Lambert-St Louis from your nearest city or airport

Cheap St. Louis flight deals and tips

Summary info about St. Louis flight prices, duration and airlines

Best One-Way Price

Best Round-Trip Price

Fastest flight time

Popular in

Frequently asked questions about flying to St. Louis

How far in advance should I book a flight to St. Louis?

Is there an alternative airport near St. Louis?

Is there a cheaper alternative to flying into St. Louis?

When did momondo last update prices for flights to Lambert-St Louis Airport?

How many operators does momondo search for flights to Lambert-St Louis Airport?

How old do you have to be to fly to Lambert-St Louis Airport?

What documentation or ID do you need to fly to Lambert-St Louis Airport?

Traveling to a place near St. Louis?

Why use momondo?

Why should I use momondo to find a flight deal to St. Louis?

Can I find flights to St. Louis with flexible booking policies on momondo?

How can momondo help me find flights to St. Louis?

I’m not ready to book a flight to St. Louis right now. Can momondo alert me if prices change?

An easier way to manage your Lambert-St Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to St. Louis

Popular flights to St. Louis

Popular routes according to searches in the past day on momondo