What airlines fly to St. Louis?

Southwest, American Airlines and Frontier are the top three most popular airlines that fly to St. Louis from United States according to our data. Southwest is the first choice among our users, with 39% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 14 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from United States to Lambert-St Louis?

Southwest, Frontier, and United Airlines are the most popular carriers operating from United States to Lambert-St Louis

What is the most punctual flight time for the United States to St. Louis flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on the United States to St. Louis flights?

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 15% of their flights experiencing any sort of delay.

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 New York and flying into St. Louis (one of the most popular routes), then the duration is 2h 45m on average. Another popular route from United States to St. Louis is flying from Boston to St. Louis, which will take roughly 2h 50m. Keep in mind that layovers or delays could extend your travel time.

How many flights depart from United States to St. Louis on average per day?

77 flights are operational daily from United States to St. Louis as of January 2026. The most popular departure time for this route is 6:00PM, with 42% of flights per day taking off in the evening.

How often are flights from the United States to St. Louis delayed?

Historically, on average around 16% of flights between United States and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 127 minutes.

How many flights depart from United States to St. Louis on average per week?

540 flights are operational weekly from United States to St. Louis as of January 2026. The most popular departure day for this route is Thu, with 19% of flights per week taking off on this day.

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

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

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

As of January 2026, there are 9 operators available to choose from for flights from United States to Lambert-St Louis Airport.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States to Lambert-St Louis Airport.

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

The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$43 Cheap Flights from the United States to St. Louis in 2026

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Find the cheapest flights from the United States to St. Louis

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One-way

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Recent round-trip flight deals from the United States to St. Louis

Enter your travel dates to find the best prices.

6:35 am - 9:49 am

DEN

STL

2h 14mnonstop

8:12 pm - 9:49 pm

STL

DEN

2h 37mnonstop

$88Frontier

Fri, Mar 6 - Mon, Mar 9

10:01 am - 1:09 pm

DEN

STL

2h 08mnonstop

8:12 pm - 9:49 pm

STL

DEN

2h 37mnonstop

$89Frontier

Fri, Feb 27 - Fri, Mar 6

10:48 am - 1:56 pm

DEN

STL

2h 08mnonstop

8:17 pm - 7:39 am

STL

DEN

12h 22m

1 stop

$92Frontier

Sat, Feb 14 - Wed, Feb 18

7:50 am - 9:20 am

MSP

STL

1h 30mnonstop

8:25 am - 10:00 am

STL

MSP

1h 35mnonstop

$117Southwest

Tue, Apr 28 - Tue, May 5

7:45 am - 9:35 am

MSP

STL

1h 50mnonstop

4:30 pm - 10:20 pm

STL

MSP

5h 50m

1 stop

$127Southwest

Tue, Feb 10 - Tue, Feb 17

9:51 pm - 11:25 pm

MSP

STL

1h 34mnonstop

3:40 pm - 5:26 pm

STL

MSP

1h 46mnonstop

$144Delta

Wed, Feb 11 - Sat, Feb 14

10:54 am - 6:34 pm

MSP

STL

7h 40m

1 stop

6:52 am - 2:02 pm

STL

MSP

7h 10m

1 stop

$159American Airlines

Tue, Feb 3 - Tue, Feb 10

6:45 pm - 8:23 pm

IAD

STL

2h 38mnonstop

9:55 am - 4:05 pm

STL

IAD

5h 10m

1 stop

$245United Airlines

Sat, Feb 14 - Tue, Feb 17

6:45 pm - 8:23 pm

IAD

STL

2h 38mnonstop

8:30 am - 11:40 am

STL

IAD

2h 10mnonstop

$254United Airlines

Sat, Feb 14 - Tue, Feb 17

11:25 am - 1:21 pm

LGA

STL

2h 56mnonstop

7:05 am - 10:33 am

STL

LGA

2h 28mnonstop

$259American Airlines

Sat, Feb 14 - Wed, Feb 18

American Airlines flights from United States to St. Louis

Our best American Airlines deals on United States to St. Louis flight tickets

American Airlines

Feb 3

MSP10:54 amMinneapolis St Paul

7h 40m

1 stop

STL6:34 pmLambert-St Louis

Feb 10

STL6:52 amLambert-St Louis

7h 10m

1 stop

MSP2:02 pmMinneapolis St Paul

$159

American Airlines

Feb 21

MSP10:47 amMinneapolis St Paul

6h 26m

1 stop

STL5:13 pmLambert-St Louis

Feb 28

STL6:36 pmLambert-St Louis

5h 28m

1 stop

MSP12:04 amMinneapolis St Paul

$211

American Airlines

Feb 14

LGA11:25 amNew York LaGuardia

2h 56m

STL1:21 pmLambert-St Louis

Feb 18

STL7:05 amLambert-St Louis

2h 28m

LGA10:33 amNew York LaGuardia

$259

Frontier flights from United States to St. Louis

Our best Frontier deals on United States to St. Louis flight tickets

Frontier

Mar 6

DEN6:35 amDenver Intl

2h 14m

STL9:49 amLambert-St Louis

Mar 9

STL8:12 pmLambert-St Louis

2h 37m

DEN9:49 pmDenver Intl

$88

Frontier

Feb 27

DEN10:01 amDenver Intl

2h 08m

STL1:09 pmLambert-St Louis

Mar 6

STL8:12 pmLambert-St Louis

2h 37m

DEN9:49 pmDenver Intl

$89

Frontier

Feb 14

DEN10:48 amDenver Intl

2h 08m

STL1:56 pmLambert-St Louis

Feb 18

STL8:17 pmLambert-St Louis

12h 22m

1 stop

DEN7:39 amDenver Intl

$92

momondo Fare Finder

Use the filters below to find and compare flights from the United States to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 3/6

6:35 am-9:49 am

Nonstop2h 14m

Lambert-St Louis

Mon 3/9

8:12 pm-9:49 pm

Nonstop2h 37m

$88

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 2/27

10:01 am-1:09 pm

Nonstop2h 08m

Lambert-St Louis

Fri 3/6

8:12 pm-9:49 pm

Nonstop2h 37m

$89

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 2/14

10:48 am-1:56 pm

Nonstop2h 08m

Lambert-St Louis

Wed 2/18

8:17 pm-7:39 am

1 stop12h 22m

$92

MinneapolisSt. Louis

MSP - STL

MSPSTL

Minneapolis St Paul

Tue 4/28

7:50 am-9:20 am

Nonstop1h 30m

Lambert-St Louis

Tue 5/5

8:25 am-10:00 am

Nonstop1h 35m

$117

MinneapolisSt. Louis

MSP - STL

MSPSTL

Minneapolis St Paul

Tue 2/10

7:45 am-9:35 am

Nonstop1h 50m

Lambert-St Louis

Tue 2/17

4:30 pm-10:20 pm

1 stop5h 50m

$127

MinneapolisSt. Louis

MSP - STL

MSPSTL

Minneapolis St Paul

Wed 2/11

9:51 pm-11:25 pm

Nonstop1h 34m

Lambert-St Louis

Sat 2/14

3:40 pm-5:26 pm

Nonstop1h 46m

$144

MinneapolisSt. Louis

MSP - STL

MSPSTL

Minneapolis St Paul

Tue 2/3

10:54 am-6:34 pm

1 stop7h 40m

Lambert-St Louis

Tue 2/10

6:52 am-2:02 pm

1 stop7h 10m

$159

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 2/14

6:45 pm-8:23 pm

Nonstop2h 38m

Lambert-St Louis

Tue 2/17

9:55 am-4:05 pm

1 stop5h 10m

$245

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 2/14

6:45 pm-8:23 pm

Nonstop2h 38m

Lambert-St Louis

Tue 2/17

8:30 am-11:40 am

Nonstop2h 10m

$254

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Sat 2/14

11:25 am-1:21 pm

Nonstop2h 56m

Lambert-St Louis

Wed 2/18

7:05 am-10:33 am

Nonstop2h 28m

$259

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from United States to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

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 $298. The month of April is another great option to travel to St. Louis, with average flight prices from United States averaging around $308.

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 $313. 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 $441. 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 afternoon is the least expensive time of day to depart. momondo users have found prices as low as $341 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $368 per ticket.

What is the cheapest United States to Lambert-St Louis flight route?

Fly from Orlando to Lambert-St Louis for the best United States - Lambert-St Louis flight prices

What cabin class options are available on United States to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on United States to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on United States to St. Louis flights?

No. A direct flight is the cheapest option for a flight between United States to St. Louis.

Cheap United States to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United States to St. Louis

Best Price Found	$89
Fastest flight time	1h 05m
Direct flights	Every day
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from United States in the past 72 hours is $89. The best round-trip flight deal from United States to St. Louis found on momondo in the last 72 hours is $61.

The fastest flight from United States to St. Louis takes 1h 05m

Direct flights go from United States to St. Louis every day.

There is 1 airport in St. Louis. From United States there are direct flights to Lambert-St Louis (STL).

Search flight deals

When did momondo last update prices for flights from United States to Lambert-St Louis Airport?
Prices for flights from United States to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from United States to Lambert-St Louis Airport?
As of January 2026, there are 9 operators available to choose from for flights from United States to Lambert-St Louis Airport.
How old do you have to be to fly from United States to Lambert-St Louis Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from United States to St. Louis?
Based on momondo bookings for flights between United States and St. Louis, the leading plane model is Boeing 737 MAX 8, making up 18.94% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 13.85%, Boeing 737-700 Passenger/BBJ1 (winglets) with 10.72%, and Embraer 175 with 7.92%.

Best airlines flying from United States to St. Louis

Compare and see reviews for airlines that fly from United States to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $49	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $54	Free Cancellation	Rating 6.3 8,319 reviews	Search Spirit Airlines flights
Delta	PriceFrom $126	Free Cancellation	Rating 7.9 8,048 reviews	Search Delta flights
American Airlines	PriceFrom $133	Free Cancellation	Rating 7.2 11,129 reviews	Search American Airlines flights
United Airlines	PriceFrom $154	Free Cancellation	Rating 7.4 9,163 reviews	Search United Airlines flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,258 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $257	Free Cancellation	Rating 8.0 11,713 reviews	Search Alaska Airlines flights
JetBlue	PriceFrom $385	Free Cancellation	Rating 7.2 2,887 reviews	Search JetBlue flights

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Chesterfield

Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Fenton

Collinsville

St. Peters

Wentzville

Alton

Farmington

Clayton

Eureka

Edwardsville

Festus

Glencoe

Litchfield

Shrewsbury

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from United States to St. Louis for you.

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

Yes. momondo enables you to select and highlight flights to St. Louis from United States with this policy.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from United States to St. Louis.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from United States and alert you when they change.

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Cheap flights from the United States to St. Louis from $43

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to St. Louis departing on 3/9. 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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American Airlines flights from United States to St. Louis

Our best American Airlines deals on United States to St. Louis flight tickets

Frontier flights from United States to St. Louis

Our best Frontier deals on United States to St. Louis flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from the United States to St. Louis that are best for you.

See travel insights to St. Louis from

How to get the cheapest flight ticket from United States to St. Louis

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

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?

What is the cheapest United States to Lambert-St Louis flight route?

Fly from Orlando to Lambert-St Louis for the best United States - Lambert-St Louis flight prices

What cabin class options are available on United States to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on United States to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on United States to St. Louis flights?

No. A direct flight is the cheapest option for a flight between United States to St. Louis.

What is the cheapest airline that flies from United States to Lambert-St Louis?

Southwest, Frontier, and United Airlines are the most popular carriers operating from United States to Lambert-St Louis

What airlines fly to St. Louis?

How often are flights from the United States to St. Louis delayed?

Historically, on average around 16% of flights between United States and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 127 minutes.

What is the most punctual flight time for the United States to St. Louis flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on the United States to St. Louis flights?

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 15% of their flights experiencing any sort of delay.

How many flights depart from United States to St. Louis on average per day?

77 flights are operational daily from United States to St. Louis as of January 2026. The most popular departure time for this route is 6:00PM, with 42% of flights per day taking off in the evening.

How many flights depart from United States to St. Louis on average per week?

540 flights are operational weekly from United States to St. Louis as of January 2026. The most popular departure day for this route is Thu, with 19% of flights per week taking off on this day.

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

Cheap United States to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United States to St. Louis

Best Price Found

Fastest flight time

Direct flights

Airports in St. Louis

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

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

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

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

What is the most popular plane model from United States to St. Louis?

Best airlines flying from United States to St. Louis

Compare and see reviews for airlines that fly from United States to St. Louis with momondo

Traveling to a place near St. Louis?

Why use momondo?

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

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

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

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

An easier way to manage your 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 the United States

Airports servicing Missouri