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

Frontier is the most popular carrier operating from Lambert-St Louis to United States

What airlines fly to United States?

Frontier, Southwest and American Airlines are the top three most popular airlines that fly to United States from St. Louis according to our data. Frontier is the first choice among our users, with 36% of people opting to fly with this airline when traveling to United States. Keep in mind that there are 10 different airlines that fly to United States on a routine basis, so you have a few additional options to choose from.

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

70 flights are operational daily from St. Louis to United States as of September 2025. The most popular departure time for this route is 6:00AM, with 46% of flights per day taking off at noon.

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

As of September 2025, 495 flights take off from St. Louis and land in United States each week. The most common flight departure day for this route is Mon, with 24% of weekly flights taking off on this day.

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

Prices for flights from Lambert-St Louis Airport to United States refresh daily.

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

As of September 2025, there are 9 operators available to choose from for flights from Lambert-St Louis Airport to United States.

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

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 Lambert-St Louis Airport to United States.

What documentation or ID do you need to fly to United States?

The required travel and health documents for your United States trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at United States. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$51 Cheap Flights from St. Louis to the United States in 2025

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

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

8:40 pm - 10:10 pmSTL-DEN

2h 30mnonstop

5:00 am - 8:07 amDEN-STL

2h 07mnonstop

$91Frontier

Find Deal

Sat, Nov 1 - Sun, Nov 2

7:55 pm - 9:20 pmSTL-DEN

2h 25mnonstop

6:00 am - 9:06 amDEN-STL

2h 06mnonstop

$96Frontier

Find Deal

Thu, Sep 11 - Mon, Sep 15

5:20 am - 7:18 amSTL-DFW

1h 58mnonstop

9:29 pm - 11:18 pmDFW-STL

1h 49mnonstop

$159American Airlines

Find Deal

Tue, Oct 7 - Sat, Oct 11

5:18 am - 7:14 amSTL-DFW

1h 56mnonstop

4:33 pm - 6:20 pmDFW-STL

1h 47mnonstop

$169American Airlines

Find Deal

Sat, Sep 27 - Sat, Oct 4

11:48 am - 3:10 pmSTL-EWR

2h 22mnonstop

8:49 am - 10:41 amEWR-STL

2h 52mnonstop

$197United Airlines

Find Deal

Fri, Nov 14 - Sun, Nov 16

6:43 pm - 12:13 amSTL-EWR

4h 30m1 stop

8:49 am - 10:41 amEWR-STL

2h 52mnonstop

$207United Airlines

Find Deal

Fri, Nov 14 - Sun, Nov 16

2:15 pm - 9:27 pmSTL-MIA

6h 12m1 stop

6:00 am - 12:35 pmMIA-STL

7h 35m1 stop

$217Delta

Find Deal

Tue, Oct 14 - Tue, Oct 21

6:00 am - 9:28 amSTL-LGA

2h 28mnonstop

6:30 am - 8:24 amLGA-STL

2h 54mnonstop

$217Delta

Find Deal

Fri, Nov 7 - Sun, Nov 9

9:45 am - 4:10 pmSTL-MIA

5h 25m1 stop

4:55 pm - 6:55 pmMIA-STL

3h 00mnonstop

$230Southwest

Find Deal

Tue, Dec 9 - Tue, Dec 16

6:30 am - 11:55 amSTL-MIA

4h 25m1 stop

4:55 pm - 6:55 pmMIA-STL

3h 00mnonstop

$234Southwest

Find Deal

Mon, Oct 27 - Tue, Nov 4

Delta flights from St. Louis to United States

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

Delta

Oct 14

STL2:15 pmLambert-St Louis

6h 12m

1 stop

MIA9:27 pmMiami

Oct 21

MIA6:00 amMiami

7h 35m

1 stop

STL12:35 pmLambert-St Louis

$217

Find similar

Delta

Feb 10

STL6:00 amLambert-St Louis

7h 39m

1 stop

MIA2:39 pmMiami

Feb 18

MIA5:55 pmMiami

6h 45m

1 stop

STL11:40 pmLambert-St Louis

$219

Find similar

Delta

Oct 29

STL5:40 pmLambert-St Louis

2h 23m

LGA9:03 pmNew York LaGuardia

Nov 2

LGA5:30 amNew York LaGuardia

2h 43m

STL7:13 amLambert-St Louis

$227

Find similar

Southwest flights from St. Louis to United States

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

Southwest

Dec 9

STL9:45 amLambert-St Louis

5h 25m

1 stop

MIA4:10 pmMiami

Dec 16

MIA4:55 pmMiami

3h 00m

STL6:55 pmLambert-St Louis

$230

Find similar

Southwest

Oct 27

STL6:30 amLambert-St Louis

4h 25m

1 stop

MIA11:55 amMiami

Nov 4

MIA4:55 pmMiami

3h 00m

STL6:55 pmLambert-St Louis

$234

Find similar

Southwest

Oct 31

STL7:20 pmLambert-St Louis

2h 20m

LGA10:40 pmNew York LaGuardia

Nov 2

LGA5:30 amNew York LaGuardia

2h 45m

STL7:15 amLambert-St Louis

$239

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 11/1

8:40 pm-10:10 pm

Nonstop2h 30m

Denver Intl

Sun 11/2

5:00 am-8:07 am

Nonstop2h 07m

$91

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Thu 9/11

7:55 pm-9:20 pm

Nonstop2h 25m

Denver Intl

Mon 9/15

6:00 am-9:06 am

Nonstop2h 06m

$96

St. LouisDallas

STL - DFW

STLDFW

Lambert-St Louis

Tue 10/7

5:20 am-7:18 am

Nonstop1h 58m

Dallas/Fort Worth

Sat 10/11

9:29 pm-11:18 pm

Nonstop1h 49m

$159

St. LouisDallas

STL - DFW

STLDFW

Lambert-St Louis

Sat 9/27

5:18 am-7:14 am

Nonstop1h 56m

Dallas/Fort Worth

Sat 10/4

4:33 pm-6:20 pm

Nonstop1h 47m

$169

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Fri 11/14

11:48 am-3:10 pm

Nonstop2h 22m

Newark

Sun 11/16

8:49 am-10:41 am

Nonstop2h 52m

$197

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Fri 11/14

6:43 pm-12:13 am

1 stop4h 30m

Newark

Sun 11/16

8:49 am-10:41 am

Nonstop2h 52m

$207

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Tue 10/14

2:15 pm-9:27 pm

1 stop6h 12m

Miami

Tue 10/21

6:00 am-12:35 pm

1 stop7h 35m

$217

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Fri 11/7

6:00 am-9:28 am

Nonstop2h 28m

New York LaGuardia

Sun 11/9

6:30 am-8:24 am

Nonstop2h 54m

$217

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Tue 12/9

9:45 am-4:10 pm

1 stop5h 25m

Miami

Tue 12/16

4:55 pm-6:55 pm

Nonstop3h 00m

$230

St. LouisMiami

STL - MIA

STLMIA

Lambert-St Louis

Mon 10/27

6:30 am-11:55 am

1 stop4h 25m

Miami

Tue 11/4

4:55 pm-6:55 pm

Nonstop3h 00m

$234

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 St. Louis to United States

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

Other information

What is the cheapest month to fly to United States?

In general, April is the cheapest month to fly from St. Louis to United States. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $264. If you aren’t able to travel during the month of April, then book flights to United States from St. Louis during September instead. Flights to United States in September, while not as cheap as those in April, still average around $277.

What is the cheapest day to depart on your flight to United States?

According to our data, Tuesday is the cheapest day to fly to United States from St. Louis. The lowest ticket price found for a Tuesday departure recently was $349. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $401. These prices are subject to change though, so be sure to set up a Price Alert for flights to United States.

What is the cheapest time of day to depart on your flight to United States?

The cheapest time of day to fly to United States is at noon when flights can be purchased for as low as $304. Try not to purchase tickets in the afternoon because they tend to be around $402. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

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

How far in advance should I book a flight to United States?

You are more likely to see cheaper flights to United States from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to United States for around $331 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United States from St. Louis for as low as $226 on momondo.

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

There are 4 cabin classes available to choose from on Lambert-St Louis to United States 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 St. Louis to United States flights?

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

Cheap St. Louis to United States flight deals and tips

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

Best Price Found	$59
Fastest flight time	1h 50m
Direct flights	Every day
Airports in United States	1 airport

The best one-way flight to United States from St. Louis in the past 72 hours is $59. The best round-trip flight deal from St. Louis to United States found on momondo in the last 72 hours is $78.

The fastest flight from St. Louis to United States takes 1h 50m

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

There is 1 airport near United States: Dallas/Fort Worth (DFW)

Search flight deals

When did momondo last update prices for flights from Lambert-St Louis Airport to United States?
Prices for flights from Lambert-St Louis Airport to United States refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to United States?
As of September 2025, there are 9 operators available to choose from for flights from Lambert-St Louis Airport to United States.
How old do you have to be to fly from Lambert-St Louis Airport to United States?
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 Lambert-St Louis Airport to United States.
What documentation or ID do you need to fly to United States?
The required travel and health documents for your United States trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at United States. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from St. Louis to United States?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to United States is Boeing 737-800 Passenger/BBJ2 (winglets), representing 20.05% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 16.85%, Boeing 737-700 Passenger/BBJ1 (winglets) at 13.23%, and Embraer 175 at 7.76%.

Best airlines flying from St. Louis to United States

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $54	Free Cancellation	Rating 5.8 3,200 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $68	Free Cancellation	Rating 6.3 8,009 reviews	Search Spirit Airlines flights
Allegiant Air	PriceFrom $104	Free Cancellation	Rating 7.2 701 reviews	Search Allegiant Air flights
Delta	PriceFrom $128	Free Cancellation	Rating 7.9 7,974 reviews	Search Delta flights
United Airlines	PriceFrom $153	Free Cancellation	Rating 7.4 8,936 reviews	Search United Airlines flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,239 reviews	Search Southwest flights
Southern / Mokulele	PriceFrom $189	Free Cancellation	Rating 6.5 27 reviews	Search Southern / Mokulele flights
American Airlines	PriceFrom $194	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $296	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights

Why use momondo?

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

Finding the right flight to United States from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to United States quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for St. Louis to United States flights to just show those with flexible booking policies.

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

Once you have performed a search for St. Louis to United States flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to United States from 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 United States 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.

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Find better results for your trip to the United States

Popular cities in the United States

Flights to New Yorkfrom $28

Flights to Los Angelesfrom $47

Flights to Miamifrom $40

Flights to Chicagofrom $58

Flights to Orlandofrom $45

Flights to Las Vegasfrom $39

Flights to San Franciscofrom $44

Flights to Washington, D.C.from $38

Flights to Bostonfrom $51

Flights to Atlantafrom $38

Flights to Dallasfrom $56

Flights to Seattlefrom $84

Cheap flights from St. Louis to the United States from $51

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to the United States departing on 9/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

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

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Delta flights from St. Louis to United States

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

Southwest flights from St. Louis to United States

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

momondo Fare Finder

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

See travel insights to the United States from

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

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

What is the cheapest month to fly to United States?

What is the cheapest day to depart on your flight to United States?

What is the cheapest time of day to depart on your flight to United States?

The cheapest time of day to fly to United States is at noon when flights can be purchased for as low as $304. Try not to purchase tickets in the afternoon because they tend to be around $402. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

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

How far in advance should I book a flight to United States?

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

There are 4 cabin classes available to choose from on Lambert-St Louis to United States 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 St. Louis to United States flights?

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

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

Frontier is the most popular carrier operating from Lambert-St Louis to United States

What airlines fly to United States?

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

70 flights are operational daily from St. Louis to United States as of September 2025. The most popular departure time for this route is 6:00AM, with 46% of flights per day taking off at noon.

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

As of September 2025, 495 flights take off from St. Louis and land in United States each week. The most common flight departure day for this route is Mon, with 24% of weekly flights taking off on this day.

Cheap St. Louis to United States flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in United States

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

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

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

What documentation or ID do you need to fly to United States?

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

Best airlines flying from St. Louis to United States

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

Why use momondo?

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

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

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

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

An easier way to manage your United States 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

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo