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 November 2025, 626 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 19% of weekly flights taking off on this day.

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

89 flights are operational daily from St. Louis to United States as of November 2025. The most popular departure time for this route is 7:00AM, with 45% of flights per day taking off in the afternoon.

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 38% of people opting to fly with this airline when traveling to United States. Keep in mind that there are 9 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 often are flights from St. Louis to the United States delayed?

Historically, on average around 14% 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 128 minutes.

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

According to our data, JetBlue have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

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.

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 November 2025, there are 7 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.

$32 Cheap Flights from St. Louis to the United States in 2025/26

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

6:50 am - 10:02 amDEN-STL

2h 12mnonstop

$90Frontier

Find Deal

Fri, Jan 9 - Mon, Jan 12

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

6:50 am - 10:02 amDEN-STL

2h 12mnonstop

$91Frontier

Find Deal

Fri, Jan 9 - Sat, Jan 10

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

$96Frontier

Find Deal

Wed, Dec 10 - Sat, Dec 13

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

$97Frontier

Find Deal

Wed, Dec 10 - Wed, Dec 17

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

$99Frontier

Find Deal

Wed, Dec 10 - Sat, Dec 13

3:25 pm - 6:45 pmSTL-MCO

2h 20mnonstop

7:40 pm - 9:25 pmMCO-STL

2h 45mnonstop

$117Southwest

Find Deal

Sat, Feb 21 - Tue, Feb 24

3:54 pm - 6:05 pmSTL-DFW

2h 11mnonstop

9:19 am - 11:03 amDFW-STL

1h 44mnonstop

$139American Airlines

Find Deal

Sat, Jan 17 - Sun, Jan 18

3:54 pm - 6:05 pmSTL-DFW

2h 11mnonstop

9:19 am - 11:03 amDFW-STL

1h 44mnonstop

$140American Airlines

Find Deal

Sat, Jan 17 - Sun, Jan 18

10:42 am - 7:48 amSTL-EWR

20h 06m1 stop

5:15 am - 11:07 amEWR-STL

6h 52m1 stop

$159Multiple Airlines

Find Deal

Sun, Dec 7 - Thu, Dec 11

3:43 pm - 1:10 amSTL-EWR

8h 27m1 stop

5:00 am - 10:34 pmEWR-STL

18h 34m1 stop

$160Multiple Airlines

Find Deal

Thu, Jan 8 - Wed, Jan 14

Frontier flights from St. Louis to United States

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

Frontier

Jan 9

STL7:43 pmLambert-St Louis

2h 32m

DEN9:15 pmDenver Intl

Jan 12

DEN6:50 amDenver Intl

2h 12m

STL10:02 amLambert-St Louis

$90

Find similar

Frontier

Jan 9

STL7:43 pmLambert-St Louis

2h 32m

DEN9:15 pmDenver Intl

Jan 10

DEN6:50 amDenver Intl

2h 12m

STL10:02 amLambert-St Louis

$91

Find similar

Frontier

Dec 10

STL7:43 pmLambert-St Louis

2h 32m

DEN9:15 pmDenver Intl

Dec 13

DEN7:05 amDenver Intl

2h 09m

STL10:14 amLambert-St Louis

$96

Find similar

Southwest flights from St. Louis to United States

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

Southwest

Feb 21

STL3:25 pmLambert-St Louis

2h 20m

MCO6:45 pmOrlando

Feb 24

MCO7:40 pmOrlando

2h 45m

STL9:25 pmLambert-St Louis

$117

Find similar

Southwest

Jan 17

STL6:55 amLambert-St Louis

7h 15m

1 stop

LGA3:10 pmNew York LaGuardia

Jan 18

LGA4:45 pmNew York LaGuardia

3h 05m

STL6:50 pmLambert-St Louis

$271

Find similar

Southwest

Jan 3

STL7:10 pmLambert-St Louis

2h 15m

LGA10:25 pmNew York LaGuardia

Jan 7

LGA7:20 amNew York LaGuardia

10h 30m

2 stops

STL4:50 pmLambert-St Louis

$276

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

Fri 1/9

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

Mon 1/12

6:50 am-10:02 am

Nonstop2h 12m

$90

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 1/9

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

Sat 1/10

6:50 am-10:02 am

Nonstop2h 12m

$91

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 12/10

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

Sat 12/13

7:05 am-10:14 am

Nonstop2h 09m

$96

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 12/10

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

Wed 12/17

7:05 am-10:14 am

Nonstop2h 09m

$97

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 12/10

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

Sat 12/13

7:05 am-10:14 am

Nonstop2h 09m

$99

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Sat 2/21

3:25 pm-6:45 pm

Nonstop2h 20m

Orlando

Tue 2/24

7:40 pm-9:25 pm

Nonstop2h 45m

$117

St. LouisDallas

STL - DFW

STLDFW

Lambert-St Louis

Sat 1/17

3:54 pm-6:05 pm

Nonstop2h 11m

Dallas/Fort Worth

Sun 1/18

9:19 am-11:03 am

Nonstop1h 44m

$139

St. LouisDallas

STL - DFW

STLDFW

Lambert-St Louis

Sat 1/17

3:54 pm-6:05 pm

Nonstop2h 11m

Dallas/Fort Worth

Sun 1/18

9:19 am-11:03 am

Nonstop1h 44m

$140

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Sun 12/7

10:42 am-7:48 am

1 stop20h 06m

Newark

Thu 12/11

5:15 am-11:07 am

1 stop6h 52m

$159

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Thu 1/8

3:43 pm-1:10 am

1 stop8h 27m

Newark

Wed 1/14

5:00 am-10:34 pm

1 stop18h 34m

$160

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 $261. 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 $334. 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 $430. 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 $309. Try not to purchase tickets in the afternoon because they tend to be around $397. 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 Denver Intl 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 $321 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 $217 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	$64
Fastest flight time	1h 49m
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 $64. The best round-trip flight deal from St. Louis to United States found on momondo in the last 72 hours is $158.

The fastest flight from St. Louis to United States takes 1h 49m

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 November 2025, there are 7 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 21.05% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 19.11%, Boeing 737-700 Passenger/BBJ1 (winglets) at 10.79%, and Embraer 175 at 7.85%.

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 $50	Free Cancellation	Rating 5.8 3,097 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $73	Free Cancellation	Rating 6.3 8,159 reviews	Search Spirit Airlines flights
Delta	PriceFrom $108	Free Cancellation	Rating 7.9 7,993 reviews	Search Delta flights
United Airlines	PriceFrom $150	Free Cancellation	Rating 7.4 9,039 reviews	Search United Airlines flights
American Airlines	PriceFrom $160	Free Cancellation	Rating 7.2 11,043 reviews	Search American Airlines flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,252 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $257	Free Cancellation	Rating 8.0 11,340 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.

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Find better results for your trip to the United States

Popular cities in the United States

Flights to New Yorkfrom $33

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Flights to Chicagofrom $58

Flights to Orlandofrom $48

Flights to Las Vegasfrom $49

Flights to San Franciscofrom $57

Flights to Washington, D.C.from $38

Flights to Bostonfrom $59

Flights to Atlantafrom $48

Flights to Dallasfrom $54

Flights to Seattlefrom $58

Cheap flights from St. Louis to the United States from $32

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 12/13. 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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Big names and deals

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

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Frontier flights from St. Louis to United States

Our best Frontier 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 $309. Try not to purchase tickets in the afternoon because they tend to be around $397. 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 Denver Intl 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 14% 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 128 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, JetBlue have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

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

89 flights are operational daily from St. Louis to United States as of November 2025. The most popular departure time for this route is 7:00AM, with 45% of flights per day taking off in the afternoon.

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

As of November 2025, 626 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 19% 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