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

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

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

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

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 14% of their flights experiencing any sort of delay.

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.

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

68 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.

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.

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

Historically, on average around 15% 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 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.

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 8 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.

$40 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.

6:00 am - 6:51 am

ATL

STL

1h 51mnonstop

8:17 pm - 10:57 pm

STL

ATL

1h 40mnonstop

$58Frontier

Wed, Feb 18 - Sat, Feb 21

6:00 am - 6:51 am

ATL

STL

1h 51mnonstop

8:17 pm - 10:57 pm

STL

ATL

1h 40mnonstop

$68Frontier

Wed, Feb 4 - Wed, Feb 11

6:00 am - 6:51 am

ATL

STL

1h 51mnonstop

8:22 pm - 11:06 pm

STL

ATL

1h 44mnonstop

$73Frontier

Mon, Feb 2 - Wed, Feb 4

5:34 pm - 11:59 pm

IAD

STL

7h 25m

1 stop

8:30 am - 11:40 am

STL

IAD

2h 10mnonstop

$245United Airlines

Sat, Feb 14 - Sat, Feb 21

1:05 pm - 5:43 pm

IAD

STL

5h 38m

1 stop

3:11 pm - 9:17 pm

STL

IAD

5h 06m

1 stop

$255United Airlines

Wed, Feb 4 - Tue, Feb 10

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

6:05 am - 2:35 pm

LGA

STL

9h 30m

1 stop

6:00 am - 9:20 am

STL

LGA

2h 20mnonstop

$261Southwest

Tue, Mar 31 - Sat, Apr 11

9:40 am - 5:12 pm

JFK

STL

8h 32m

1 stop

6:00 am - 11:33 am

STL

JFK

4h 33m

1 stop

$261American Airlines

Wed, Apr 22 - Tue, Apr 28

9:05 am - 10:55 am

LGA

STL

2h 50mnonstop

6:00 am - 9:20 am

STL

LGA

2h 20mnonstop

$266Southwest

Wed, May 13 - Sat, May 16

5:19 pm - 11:36 pm

HOU

STL

6h 17m

1 stop

5:01 pm - 10:28 pm

STL

HOU

5h 27m

1 stop

$333Delta

Wed, Feb 18 - Sat, Feb 21

United Airlines flights from United States to St. Louis

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

United Airlines

Feb 14

IAD6:45 pmWashington, D.C. Dulles Intl

2h 38m

STL8:23 pmLambert-St Louis

Feb 17

STL9:55 amLambert-St Louis

5h 10m

1 stop

IAD4:05 pmWashington, D.C. Dulles Intl

$245

United Airlines

Feb 14

IAD6:45 pmWashington, D.C. Dulles Intl

2h 38m

STL8:23 pmLambert-St Louis

Feb 17

STL8:30 amLambert-St Louis

2h 10m

IAD11:40 amWashington, D.C. Dulles Intl

$254

United Airlines

Feb 14

IAD1:20 pmWashington, D.C. Dulles Intl

6h 54m

1 stop

STL7:14 pmLambert-St Louis

Feb 17

STL9:55 amLambert-St Louis

5h 10m

1 stop

IAD4:05 pmWashington, D.C. Dulles Intl

$255

Frontier flights from United States to St. Louis

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

Frontier

Feb 18

ATL6:00 amAtlanta Hartsfield-Jackson

1h 51m

STL6:51 amLambert-St Louis

Feb 21

STL8:17 pmLambert-St Louis

1h 40m

ATL10:57 pmAtlanta Hartsfield-Jackson

$58

Frontier

Feb 4

ATL6:00 amAtlanta Hartsfield-Jackson

1h 51m

STL6:51 amLambert-St Louis

Feb 11

STL8:17 pmLambert-St Louis

1h 40m

ATL10:57 pmAtlanta Hartsfield-Jackson

$68

Frontier

Feb 2

ATL6:00 amAtlanta Hartsfield-Jackson

1h 51m

STL6:51 amLambert-St Louis

Feb 4

STL8:22 pmLambert-St Louis

1h 44m

ATL11:06 pmAtlanta Hartsfield-Jackson

$73

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

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Wed 2/18

6:00 am-6:51 am

Nonstop1h 51m

Lambert-St Louis

Sat 2/21

8:17 pm-10:57 pm

Nonstop1h 40m

$58

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Wed 2/4

6:00 am-6:51 am

Nonstop1h 51m

Lambert-St Louis

Wed 2/11

8:17 pm-10:57 pm

Nonstop1h 40m

$68

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Mon 2/2

6:00 am-6:51 am

Nonstop1h 51m

Lambert-St Louis

Wed 2/4

8:22 pm-11:06 pm

Nonstop1h 44m

$73

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 2/14

5:34 pm-11:59 pm

1 stop7h 25m

Lambert-St Louis

Sat 2/21

8:30 am-11:40 am

Nonstop2h 10m

$245

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 2/4

1:05 pm-5:43 pm

1 stop5h 38m

Lambert-St Louis

Tue 2/10

3:11 pm-9:17 pm

1 stop5h 06m

$255

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

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Tue 3/31

6:05 am-2:35 pm

1 stop9h 30m

Lambert-St Louis

Sat 4/11

6:00 am-9:20 am

Nonstop2h 20m

$261

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

Wed 4/22

9:40 am-5:12 pm

1 stop8h 32m

Lambert-St Louis

Tue 4/28

6:00 am-11:33 am

1 stop4h 33m

$261

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Wed 5/13

9:05 am-10:55 am

Nonstop2h 50m

Lambert-St Louis

Sat 5/16

6:00 am-9:20 am

Nonstop2h 20m

$266

HoustonSt. Louis

HOU - STL

HOUSTL

Houston Hobby

Wed 2/18

5:19 pm-11:36 pm

1 stop6h 17m

Lambert-St Louis

Sat 2/21

5:01 pm-10:28 pm

1 stop5h 27m

$333

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 8 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 $57	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $71	Free Cancellation	Rating 6.3 8,304 reviews	Search Spirit Airlines flights
American Airlines	PriceFrom $133	Free Cancellation	Rating 7.2 11,114 reviews	Search American Airlines flights
United Airlines	PriceFrom $165	Free Cancellation	Rating 7.4 9,149 reviews	Search United Airlines flights
Delta	PriceFrom $176	Free Cancellation	Rating 7.9 8,038 reviews	Search Delta flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,256 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $257	Free Cancellation	Rating 7.9 11,697 reviews	Search Alaska Airlines flights
JetBlue	PriceFrom $385	Free Cancellation	Rating 7.2 2,883 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 $40

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 1/31. 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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United Airlines flights from United States to St. Louis

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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?

Frontier, Delta, and Southwest 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 15% 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 14% of their flights experiencing any sort of delay.

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

68 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?

478 flights are operational weekly from United States to St. Louis as of January 2026. The most popular departure day for this route is Mon, 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