How often are flights from St. Louis to London delayed?

Historically, on average around 31% of flights between St. Louis and London have experienced a delay on any given week. The average delay length over the past 12 months has been 139 minutes.

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

Friday 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 London Heathrow Airport on average per week?

The number of flights available between St. Louis and London Heathrow Airport is 15 per week as of July 2026. The most frequent departure day is Tue, with 33% of weekly flights leaving on this day.

Which airport is the most popular layover for flights between St. Louis and London Heathrow Airport?

Chicago (ORD) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

How many flights depart from St. Louis to London Heathrow Airport on average per day?

2 flights are operational daily from St. Louis to London Heathrow Airport as of July 2026. The most popular departure time for this route is 9:00PM, with 100% of flights per day taking off in the evening.

What airlines fly to London Heathrow Airport?

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from St. Louis according to our data. British Airways is the first choice among our users, with 53% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 8 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Lambert-St Louis to London Heathrow?

United Airlines and Delta are the most popular carriers operating from Lambert-St Louis to London Heathrow

Which layover airport has the shortest travel time from St. Louis to London Heathrow Airport?

Flights connecting via Toronto (YYZ) have the shortest average one-way travel time: 10h 20m.

Which layover airport offers the lowest fares from St. Louis to London Heathrow Airport?

Flights via Chicago (ORD) offer the lowest average round-trip price of $921.

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

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

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

According to our data, British Airways have had the least number of delays on this route over the last 12 months; with about 31% of their flights experiencing any sort of delay.

Which layover airport has the shortest connection time from St. Louis to London Heathrow Airport?

Atlanta (ATL) has the shortest average layover time for this route: 1h 22m.

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

Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.

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

As of July 2026, there are 8 operators available to choose from for flights from Lambert-St Louis Airport to London Heathrow Airport.

How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to London Heathrow Airport.

What documentation or ID do you need to fly to London Heathrow Airport?

The necessary travel and health documents for your London Heathrow 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.

$320 Cheap Flights from St. Louis to London Heathrow Airport in 2026

Q: What is the typical price of a round-trip flight between St. Louis and London Heathrow Airport?

Prices are currently typical for flights on this route. Typical prices usually range from $908 to $1,423. The lowest price recently found on this route was $978.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:10 pm - 10:00 am

STL

LHR

15h 50m

1 stop

6:00 am - 6:42 pm

LHR

STL

18h 42m

2 stops

$978Multiple Airlines

Wed, Aug 26 - Sun, Sep 6

9:00 am - 12:25 pm

STL

LHR

21h 25m

1 stop

5:15 pm - 6:41 pm

LHR

STL

31h 26m

2 stops

$979Multiple Airlines

Thu, Sep 3 - Wed, Sep 16

3:30 pm - 5:40 pm

STL

LHR

20h 10m

1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$980Lufthansa

Wed, Aug 26 - Sun, Sep 6

3:30 pm - 12:40 pm

STL

LHR

15h 10m

1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$981Lufthansa

Fri, Oct 2 - Tue, Oct 6

12:10 pm - 6:30 am

STL

LHR

12h 20m

1 stop

9:30 am - 6:41 pm

LHR

STL

15h 11m

1 stop

$982Multiple Airlines

Fri, Sep 11 - Fri, Sep 18

12:10 pm - 6:30 am

STL

LHR

12h 20m

1 stop

6:00 am - 8:24 pm

LHR

STL

20h 24m

2 stops

$983Air Canada

Fri, Aug 14 - Fri, Aug 21

12:10 pm - 6:30 am

STL

LHR

12h 20m

1 stop

6:50 am - 3:43 pm

LHR

STL

14h 53m

2 stops

$984United Airlines

Wed, Sep 30 - Sun, Oct 4

12:10 pm - 10:00 am

STL

LHR

15h 50m

1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$985Multiple Airlines

Thu, Aug 27 - Tue, Sep 1

3:50 pm - 1:05 pm

STL

LHR

15h 15m

1 stop

6:30 am - 5:53 pm

LHR

STL

17h 23m

2 stops

$986Delta

Fri, Aug 14 - Fri, Aug 21

12:10 pm - 6:30 am

STL

LHR

12h 20m

1 stop

12:05 pm - 8:20 pm

LHR

STL

14h 15m

1 stop

$987Multiple Airlines

Sun, Sep 6 - Sun, Sep 13

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Air Canada flights from St. Louis to London Heathrow Airport

Our best Air Canada deals on St. Louis to London Heathrow Airport flight tickets

Air Canada

Aug 14

STL12:10 pmLambert-St Louis

12h 20m

1 stop

LHR6:30 amLondon Heathrow

Aug 21

LHR6:00 amLondon Heathrow

20h 24m

2 stops

STL8:24 pmLambert-St Louis

$983

Air Canada

Nov 22

STL4:05 pmLambert-St Louis

32h 25m

2 stops

LHR6:30 amLondon Heathrow

Nov 29

LHR6:00 pmLondon Heathrow

27h 26m

1 stop

STL3:26 pmLambert-St Louis

$1,006

Air Canada

Oct 1

STL12:10 pmLambert-St Louis

15h 50m

1 stop

LHR10:00 amLondon Heathrow

Oct 13

LHR9:30 amLondon Heathrow

15h 11m

1 stop

STL6:41 pmLambert-St Louis

$1,007

Delta flights from St. Louis to London Heathrow Airport

Our best Delta deals on St. Louis to London Heathrow Airport flight tickets

Delta

Aug 14

STL3:50 pmLambert-St Louis

15h 15m

1 stop

LHR1:05 pmLondon Heathrow

Aug 21

LHR6:30 amLondon Heathrow

17h 23m

2 stops

STL5:53 pmLambert-St Louis

$986

Delta

Aug 26

STL2:10 pmLambert-St Louis

16h 55m

2 stops

LHR1:05 pmLondon Heathrow

Sep 6

LHR8:40 amLondon Heathrow

19h 23m

2 stops

STL10:03 pmLambert-St Louis

$990

Delta

Aug 19

STL9:15 amLambert-St Louis

15h 55m

2 stops

LHR7:10 amLondon Heathrow

Aug 24

LHR6:30 amLondon Heathrow

15h 47m

2 stops

STL4:17 pmLambert-St Louis

$991

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/26

12:10 pm-10:00 am

1 stop15h 50m

London Heathrow

Sun 9/6

6:00 am-6:42 pm

2 stops18h 42m

$978

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 9/3

9:00 am-12:25 pm

1 stop21h 25m

London Heathrow

Wed 9/16

5:15 pm-6:41 pm

2 stops31h 26m

$979

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/26

3:30 pm-5:40 pm

1 stop20h 10m

London Heathrow

Sun 9/6

6:30 am-1:25 pm

1 stop12h 55m

$980

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 10/2

3:30 pm-12:40 pm

1 stop15h 10m

London Heathrow

Tue 10/6

6:30 am-1:25 pm

1 stop12h 55m

$981

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 9/11

12:10 pm-6:30 am

1 stop12h 20m

London Heathrow

Fri 9/18

9:30 am-6:41 pm

1 stop15h 11m

$982

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 8/14

12:10 pm-6:30 am

1 stop12h 20m

London Heathrow

Fri 8/21

6:00 am-8:24 pm

2 stops20h 24m

$983

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/30

12:10 pm-6:30 am

1 stop12h 20m

London Heathrow

Sun 10/4

6:50 am-3:43 pm

2 stops14h 53m

$984

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 8/27

12:10 pm-10:00 am

1 stop15h 50m

London Heathrow

Tue 9/1

6:30 am-1:25 pm

1 stop12h 55m

$985

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 8/14

3:50 pm-1:05 pm

1 stop15h 15m

London Heathrow

Fri 8/21

6:30 am-5:53 pm

2 stops17h 23m

$986

Quickest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 9/6

12:10 pm-6:30 am

1 stop12h 20m

London Heathrow

Sun 9/13

12:05 pm-8:20 pm

1 stop14h 15m

$987

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 London Heathrow Airport

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

Layovers

Other information

What is the typical price of a round-trip flight between St. Louis and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from St. Louis, with most prices found around $653. If you’re not able to fly to London Heathrow Airport in October, then April is your next best option. Flight prices from St. Louis to London Heathrow Airport during April average around $733.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Thursday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $756. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $1,198.

What is the cheapest Lambert-St Louis to London Heathrow flight route?

Fly from Lambert-St Louis to London Heathrow for the best Lambert-St Louis - London Heathrow flight prices

How far in advance should I book a flight from St. Louis to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $910 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from St. Louis for as low as $835 on momondo.

What cabin class options are available on St. Louis to London Heathrow Airport flights?

There are 3 cabin classes available to choose from on St. Louis to London Heathrow Airport 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 London Heathrow Airport flights?

No. A direct flight is the cheapest option for a flight between St. Louis to London Heathrow Airport.

How have St. Louis to London Heathrow Airport flight prices changed over time?

As of July 2026, prices for St. Louis to London Heathrow Airport flights are approximately 17% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to London Heathrow Airport

Best Price Found	$587
Fastest flight time	8h 00m
Direct flights	Mon, Wed, Thu and Sat

The best one-way flight to London Heathrow Airport from St. Louis in the past 72 hours is $587. The best round-trip flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is $1,100.

The fastest flight from St. Louis to London Heathrow Airport takes 8h 00m

Direct flights go from St. Louis to London Heathrow Airport on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.

Search flight deals

Frequently asked questions about flying from St. Louis to London Heathrow Airport

How far is Lambert-St Louis to London Heathrow by plane?
Lambert-St Louis and London Heathrow are 4185.8 mi apart from one another. By plane, this route typically takes 8h 00m.
When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?
Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?
As of July 2026, there are 8 operators available to choose from for flights from Lambert-St Louis Airport to London Heathrow Airport.
How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The necessary travel and health documents for your London Heathrow 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 St. Louis to London Heathrow Airport?
Based on momondo bookings for flights between St. Louis and London Heathrow Airport, the leading plane model is Boeing 787-8 Dreamliner, making up 98.18% of the total bookings. Other popular models include Boeing 787-9 Dreamliner with 0.73%, Airbus A330-300 with 0.73%, and Embraer 175 with 0.18%.
What is the most popular airline from St. Louis to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from St. Louis to London Heathrow Airport is British Airways, representing 46% of all bookings. The subsequent popular airlines are American Airlines at 21%, United Airlines at 14%, and Air Canada at 6%.

Best airlines flying from St. Louis to London Heathrow Airport

Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $483	Free Cancellation	Rating 7.8 8,476 reviews	Search Delta flights
Iberia	PriceFrom $529	Free Cancellation	Rating 7.0 3,257 reviews	Search Iberia flights
KLM	PriceFrom $529	Free Cancellation	Rating 7.8 1,541 reviews	Search KLM flights
American Airlines	PriceFrom $532	Free Cancellation	Rating 7.1 11,827 reviews	Search American Airlines flights
Air Canada	PriceFrom $572	Free Cancellation	Rating 7.1 11,352 reviews	Search Air Canada flights
United Airlines	PriceFrom $572	Free Cancellation	Rating 7.4 10,006 reviews	Search United Airlines flights
British Airways	PriceFrom $576	Free Cancellation	Rating 6.7 8,122 reviews	Search British Airways flights
Lufthansa	PriceFrom $635	Free Cancellation	Rating 6.8 8,143 reviews	Search Lufthansa flights

American Airlines Flights From St. Louis to London Heathrow Airport
American Airlines is one of the most popular airlines flying from St. Louis to London Heathrow Airport, operating 3 flights/week on average for this route. A good American Airlines flight deal for St. Louis to London Heathrow Airport starts from $532 round-trip, up to an average price of $898. Our users have rated American Airlines at 7.1/10.
Iberia Flights From St. Louis to London Heathrow Airport
Iberia is also a popular choice for this route. Iberia flight deals for St. Louis to London Heathrow Airport start from as low as $529 round-trip, depending on your selected dates, with average Iberia deals seen on momondo around $800. Iberia operates 3 flights to London Heathrow Airport from St. Louis in an average week. Users have rated it 7.0/10 across 3,257 reviews.

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Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from St. Louis.

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

Flights from St. Louis to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential St. Louis to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to London from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Cheap flights from St. Louis to London from $320

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 London departing on 10/13. 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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Air Canada flights from St. Louis to London Heathrow Airport

Our best Air Canada deals on St. Louis to London Heathrow Airport flight tickets

Delta flights from St. Louis to London Heathrow Airport

Our best Delta deals on St. Louis to London Heathrow Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

See travel insights to London from

How to get the cheapest flight ticket from St. Louis to London Heathrow Airport

What is the typical price of a round-trip flight between St. Louis and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

What is the cheapest day to depart on your flight to London Heathrow Airport?

What is the cheapest Lambert-St Louis to London Heathrow flight route?

How far in advance should I book a flight from St. Louis to London Heathrow Airport?

What cabin class options are available on St. Louis to London Heathrow Airport flights?

Can stopping save me money on St. Louis to London Heathrow Airport flights?

How have St. Louis to London Heathrow Airport flight prices changed over time?

What is the cheapest airline that flies from Lambert-St Louis to London Heathrow?

What airlines fly to London Heathrow Airport?

How often are flights from St. Louis to London delayed?

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

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

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

Which airport is the most popular layover for flights between St. Louis and London Heathrow Airport?

Which layover airport offers the lowest fares from St. Louis to London Heathrow Airport?

Which layover airport has the shortest travel time from St. Louis to London Heathrow Airport?

Which layover airport has the shortest connection time from St. Louis to London Heathrow Airport?

How many flights depart from St. Louis to London Heathrow Airport on average per day?

How many flights depart from St. Louis to London Heathrow Airport on average per week?

When to book flights from St. Louis to London Heathrow Airport

Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from St. Louis to London Heathrow Airport

Best airlines flying from St. Louis to London Heathrow Airport

Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo

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