What is the most punctual flight time for St. Louis to the United States 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 is the cheapest airline that flies from Lambert-St Louis to United States?

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

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

As of January 2026, 351 flights take off from St. Louis and land in United States each week. The most common flight departure day for this route is Tue, with 21% of weekly flights taking off on this day.

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

Historically, on average around 15% of flights between St. Louis and United States have experienced a delay on any given week. The average delay length over the past 12 months has been 132 minutes.

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

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 40% 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.

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.

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

50 flights are operational daily from St. Louis to United States as of January 2026. The most popular departure time for this route is 7:00AM, with 52% of flights per day taking off at noon.

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 January 2026, 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.

$28 Cheap Flights from St. Louis to the United States in 2026

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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

Enter your travel dates to find the best prices.

5:42 pm - 8:58 pm

STL

MCO

2h 16mnonstop

6:10 am - 8:04 am

MCO

STL

2h 54mnonstop

$58Frontier

Fri, Feb 6 - Sun, Feb 8

3:49 pm - 7:18 pm

STL

MCO

2h 29mnonstop

5:10 am - 7:02 am

MCO

STL

2h 52mnonstop

$64Frontier

Fri, Feb 27 - Fri, Mar 6

1:45 pm - 9:49 pm

STL

SEA

10h 04m

1 stop

4:36 pm - 12:25 am

SEA

STL

5h 49m

1 stop

$177Delta

Tue, Apr 21 - Fri, Apr 24

6:38 pm - 12:24 am

STL

SEA

7h 46m

1 stop

12:07 am - 8:41 am

SEA

STL

6h 34m

1 stop

$193American Airlines

Sun, Mar 1 - Thu, Mar 5

4:46 pm - 7:15 pm

STL

SEA

4h 29mnonstop

9:48 am - 3:50 pm

SEA

STL

4h 02mnonstop

$197Alaska Airlines

Tue, Apr 28 - Sat, May 16

6:12 pm - 12:03 am

STL

SEA

7h 51m

1 stop

1:32 pm - 12:21 am

SEA

STL

8h 49m

1 stop

$198Delta

Fri, Mar 20 - Thu, Mar 26

7:00 am - 9:32 am

STL

SEA

4h 32mnonstop

5:55 pm - 11:57 pm

SEA

STL

4h 02mnonstop

$207Alaska Airlines

Wed, Apr 29 - Mon, May 18

7:05 am - 3:09 pm

STL

LGA

7h 04m

1 stop

9:10 am - 11:10 am

LGA

STL

3h 00mnonstop

$269American Airlines

Wed, Apr 15 - Sat, Apr 18

7:55 pm - 10:10 pm

STL

HOU

2h 15mnonstop

2:35 pm - 4:30 pm

HOU

STL

1h 55mnonstop

$277Southwest

Tue, Feb 24 - Tue, Mar 3

7:55 pm - 10:10 pm

STL

HOU

2h 15mnonstop

12:55 pm - 5:10 pm

HOU

STL

4h 15m

1 stop

$283Southwest

Tue, Feb 24 - Tue, Mar 3

American Airlines flights from St. Louis to United States

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

American Airlines

Mar 1

STL6:38 pmLambert-St Louis

7h 46m

1 stop

SEA12:24 amSeattle/Tacoma Intl

Mar 5

SEA12:07 amSeattle/Tacoma Intl

6h 34m

1 stop

STL8:41 amLambert-St Louis

$193

American Airlines

Feb 13

STL6:50 pmLambert-St Louis

8h 05m

1 stop

SEA12:55 amSeattle/Tacoma Intl

Feb 16

SEA10:08 pmSeattle/Tacoma Intl

9h 32m

1 stop

STL9:40 amLambert-St Louis

$207

American Airlines

Feb 13

STL6:50 pmLambert-St Louis

8h 05m

1 stop

SEA12:55 amSeattle/Tacoma Intl

Feb 16

SEA10:08 pmSeattle/Tacoma Intl

9h 32m

1 stop

STL9:40 amLambert-St Louis

$215

Southwest flights from St. Louis to United States

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

Southwest

Mar 31

STL5:00 pmLambert-St Louis

9h 40m

2 stops

SEA12:40 amSeattle/Tacoma Intl

Apr 1

SEA1:25 pmSeattle/Tacoma Intl

5h 50m

1 stop

STL9:15 pmLambert-St Louis

$233

Southwest

Feb 24

STL2:50 pmLambert-St Louis

9h 45m

1 stop

SEA10:35 pmSeattle/Tacoma Intl

Mar 3

SEA11:20 amSeattle/Tacoma Intl

8h 45m

2 stops

STL10:05 pmLambert-St Louis

$238

Southwest

Feb 28

STL9:45 amLambert-St Louis

4h 20m

LAX12:05 pmLos Angeles

Mar 7

LAX7:45 amLos Angeles

3h 30m

STL1:15 pmLambert-St Louis

$257

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. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Fri 2/6

5:42 pm-8:58 pm

Nonstop2h 16m

Orlando

Sun 2/8

6:10 am-8:04 am

Nonstop2h 54m

$58

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Fri 2/27

3:49 pm-7:18 pm

Nonstop2h 29m

Orlando

Fri 3/6

5:10 am-7:02 am

Nonstop2h 52m

$64

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 4/21

1:45 pm-9:49 pm

1 stop10h 04m

Seattle/Tacoma Intl

Fri 4/24

4:36 pm-12:25 am

1 stop5h 49m

$177

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sun 3/1

6:38 pm-12:24 am

1 stop7h 46m

Seattle/Tacoma Intl

Thu 3/5

12:07 am-8:41 am

1 stop6h 34m

$193

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 4/28

4:46 pm-7:15 pm

Nonstop4h 29m

Seattle/Tacoma Intl

Sat 5/16

9:48 am-3:50 pm

Nonstop4h 02m

$197

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 3/20

6:12 pm-12:03 am

1 stop7h 51m

Seattle/Tacoma Intl

Thu 3/26

1:32 pm-12:21 am

1 stop8h 49m

$198

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Wed 4/29

7:00 am-9:32 am

Nonstop4h 32m

Seattle/Tacoma Intl

Mon 5/18

5:55 pm-11:57 pm

Nonstop4h 02m

$207

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Wed 4/15

7:05 am-3:09 pm

1 stop7h 04m

New York LaGuardia

Sat 4/18

9:10 am-11:10 am

Nonstop3h 00m

$269

St. LouisHouston

STL - HOU

STLHOU

Lambert-St Louis

Tue 2/24

7:55 pm-10:10 pm

Nonstop2h 15m

Houston Hobby

Tue 3/3

2:35 pm-4:30 pm

Nonstop1h 55m

$277

St. LouisHouston

STL - HOU

STLHOU

Lambert-St Louis

Tue 2/24

7:55 pm-10:10 pm

Nonstop2h 15m

Houston Hobby

Tue 3/3

12:55 pm-5:10 pm

1 stop4h 15m

$283

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

Delays

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 $263. 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 $281.

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

According to our data, Wednesday is the cheapest day to fly to United States from St. Louis. The lowest ticket price found for a Wednesday departure recently was $332. 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 $429. 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 $311. Try not to purchase tickets in the afternoon because they tend to be around $399. 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 $325 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 $236 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	$69
Fastest flight time	1h 05m
Direct flights	Every day
Airports in United States	4,296 airports

The best one-way flight to United States from St. Louis in the past 72 hours is $69. The best round-trip flight deal from St. Louis to United States found on momondo in the last 72 hours is $142.

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

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

There are 4,296 airports in United States. From St. Louis there are direct flights to New York LaGuardia (LGA), Orlando (MCO), Houston Hobby (HOU).

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 January 2026, 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 MAX 8, representing 24.02% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 19.71%, Embraer 175 at 7.10%, and Boeing 737-700 Passenger/BBJ1 (winglets) at 6.07%.

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 $49	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $73	Free Cancellation	Rating 6.3 8,384 reviews	Search Spirit Airlines flights
Delta	PriceFrom $108	Free Cancellation	Rating 7.9 8,119 reviews	Search Delta flights
United Airlines	PriceFrom $150	Free Cancellation	Rating 7.4 9,205 reviews	Search United Airlines flights
Southwest	PriceFrom $176	Free Cancellation	Rating 8.0 4,268 reviews	Search Southwest flights
American Airlines	PriceFrom $180	Free Cancellation	Rating 7.2 11,197 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $296	Free Cancellation	Rating 8.0 11,795 reviews	Search Alaska Airlines flights
JetBlue	PriceFrom $304	Free Cancellation	Rating 7.2 2,890 reviews	Search JetBlue 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.

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Popular cities in the United States

Flights to New Yorkfrom $38

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Flights to Chicagofrom $56

Flights to Orlandofrom $44

Flights to San Franciscofrom $73

Flights to Las Vegasfrom $53

Flights to Washington, D.C.from $49

Flights to Bostonfrom $52

Flights to Atlantafrom $44

Flights to Dallasfrom $54

Flights to Seattlefrom $56

Cheap flights from St. Louis to the United States from $28

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 2/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Filter for what you want

Filter for what you want

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

Cheap round-trip flights

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American Airlines flights from St. Louis to United States

Our best American Airlines 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

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 $311. Try not to purchase tickets in the afternoon because they tend to be around $399. 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, American Airlines, and Delta are the most popular carriers operating from Lambert-St Louis to United States

What airlines fly to United States?

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

Historically, on average around 15% of flights between St. Louis and United States have experienced a delay on any given week. The average delay length over the past 12 months has been 132 minutes.

What is the most punctual flight time for St. Louis to the United States 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 St. Louis to the United States 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 St. Louis to United States on average per day?

50 flights are operational daily from St. Louis to United States as of January 2026. The most popular departure time for this route is 7:00AM, with 52% of flights per day taking off at noon.

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

As of January 2026, 351 flights take off from St. Louis and land in United States each week. The most common flight departure day for this route is Tue, with 21% 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