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. Wednesday has historically seen more delays on average compared to the rest of the week.

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

Historically, on average around 21% 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 131 minutes.

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 55% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 9 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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.

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.

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 21% of their flights experiencing any sort of delay.

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

Flights via Detroit (DTW) offer the lowest average round-trip price of $947.

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

Chicago (ORD) was the most common stop: 43% of momondo users choosing 1-stop flights on this route connected there.

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 August 2026, there are 9 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.

$322 Cheap Flights from St. Louis to London Heathrow Airport in 2026

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.

1:29 pm - 12:40 pm

STL

LHR

17h 11m

2 stops

7:30 pm - 9:21 pm

LHR

STL

31h 51m

2 stops

$964Lufthansa

Wed, Oct 7 - Mon, Oct 12

12:10 pm - 6:30 am

STL

LHR

12h 20m

1 stop

9:10 am - 9:52 pm

LHR

STL

18h 42m

1 stop

$964United Airlines

Wed, Oct 21 - Tue, Nov 3

9:35 pm - 11:35 am

STL

LHR

8h 00mnonstop

4:25 pm - 7:30 pm

LHR

STL

9h 05mnonstop

$964British Airways

Wed, Oct 7 - Wed, Oct 21

12:10 pm - 6:30 am

STL

LHR

12h 20m

1 stop

12:50 pm - 9:52 pm

LHR

STL

15h 02m

1 stop

$964United Airlines

Wed, Oct 21 - Wed, Nov 4

4:05 pm - 1:00 pm

STL

LHR

14h 55m

2 stops

11:10 am - 11:09 pm

LHR

STL

17h 59m

2 stops

$965Air Canada

Mon, Nov 30 - Sun, Dec 6

7:00 am - 7:15 am

STL

LHR

18h 15m

1 stop

6:30 am - 8:51 pm

LHR

STL

20h 21m

2 stops

$965Delta

Wed, Dec 16 - Thu, Jan 7

10:14 am - 6:25 am

STL

LHR

15h 11m

1 stop

11:20 am - 8:51 pm

LHR

STL

15h 31m

1 stop

$965Delta

Tue, Oct 27 - Tue, Nov 3

6:50 pm - 3:50 pm

STL

LHR

16h 00m

2 stops

8:15 pm - 9:40 pm

LHR

STL

31h 25m

2 stops

$965Lufthansa

Sun, Oct 25 - Mon, Nov 9

9:35 pm - 11:35 am

STL

LHR

8h 00mnonstop

4:25 pm - 7:30 pm

LHR

STL

9h 05mnonstop

$966British Airways

Wed, Oct 7 - Wed, Oct 21

7:30 am - 7:10 am

STL

LHR

18h 40m

2 stops

6:00 pm - 3:26 pm

LHR

STL

27h 26m

1 stop

$966Air Canada

Mon, Oct 26 - Thu, Nov 5

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Delta flights from St. Louis to London Heathrow Airport

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

Delta

Oct 26

STL3:35 pmLambert-St Louis

10h 30m

1 stop

LHR7:05 amLondon Heathrow

Nov 12

LHR9:50 amLondon Heathrow

12h 44m

1 stop

STL4:34 pmLambert-St Louis

$965

Delta

Sep 17

STL7:05 amLambert-St Louis

18h 10m

1 stop

LHR7:15 amLondon Heathrow

Oct 2

LHR8:40 amLondon Heathrow

17h 55m

2 stops

STL8:35 pmLambert-St Louis

$986

Delta

Sep 17

STL10:29 amLambert-St Louis

14h 16m

2 stops

LHR6:45 amLondon Heathrow

Oct 2

LHR8:40 amLondon Heathrow

17h 18m

2 stops

STL7:58 pmLambert-St Louis

$989

United Airlines flights from St. Louis to London Heathrow Airport

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

United Airlines

Aug 31

STL4:50 pmLambert-St Louis

31h 05m

1 stop

LHR5:55 amLondon Heathrow

Sep 7

LHR9:30 amLondon Heathrow

33h 55m

1 stop

STL1:25 pmLambert-St Louis

$968

United Airlines

Oct 24

STL4:50 pmLambert-St Louis

22h 45m

1 stop

LHR9:35 pmLondon Heathrow

Nov 3

LHR12:50 pmLondon Heathrow

15h 02m

1 stop

STL9:52 pmLambert-St Louis

$971

United Airlines

Sep 6

STL12:30 pmLambert-St Louis

15h 30m

2 stops

LHR10:00 amLondon Heathrow

Sep 13

LHR6:50 amLondon Heathrow

14h 48m

2 stops

STL3:38 pmLambert-St Louis

$988

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 10/7

1:29 pm-12:40 pm

2 stops17h 11m

London Heathrow

Mon 10/12

7:30 pm-9:21 pm

2 stops31h 51m

$964

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/21

12:10 pm-6:30 am

1 stop12h 20m

London Heathrow

Tue 11/3

9:10 am-9:52 pm

1 stop18h 42m

$964

Quickest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/7

9:35 pm-11:35 am

Nonstop8h 00m

London Heathrow

Wed 10/21

4:25 pm-7:30 pm

Nonstop9h 05m

$964

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/21

12:10 pm-6:30 am

1 stop12h 20m

London Heathrow

Wed 11/4

12:50 pm-9:52 pm

1 stop15h 02m

$964

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 11/30

4:05 pm-1:00 pm

2 stops14h 55m

London Heathrow

Sun 12/6

11:10 am-11:09 pm

2 stops17h 59m

$965

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 12/16

7:00 am-7:15 am

1 stop18h 15m

London Heathrow

Thu 1/7

6:30 am-8:51 pm

2 stops20h 21m

$965

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 10/27

10:14 am-6:25 am

1 stop15h 11m

London Heathrow

Tue 11/3

11:20 am-8:51 pm

1 stop15h 31m

$965

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 10/25

6:50 pm-3:50 pm

2 stops16h 00m

London Heathrow

Mon 11/9

8:15 pm-9:40 pm

2 stops31h 25m

$965

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/7

9:35 pm-11:35 am

Nonstop8h 00m

London Heathrow

Wed 10/21

4:25 pm-7:30 pm

Nonstop9h 05m

$966

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 10/26

7:30 am-7:10 am

2 stops18h 40m

London Heathrow

Thu 11/5

6:00 pm-3:26 pm

1 stop27h 26m

$966

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

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 $752 to $1,117.
The lowest price recently found on this route was $964.

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 $1,191.

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 $926 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 $839 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?

You could potentially save up to 14% on your flight if you consider stops on a St. Louis to London Heathrow Airport flight.

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

As of August 2026, prices for St. Louis to London Heathrow Airport flights are approximately 19% 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	$541
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 $541. The best round-trip flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is $977.

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 August 2026, there are 9 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 98.50% of the total bookings. Other popular models include Boeing 787-9 Dreamliner with 0.75%, Airbus A330-300 with 0.37%, and Embraer 175 with 0.19%.
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 47% of all bookings. The subsequent popular airlines are American Airlines at 21%, United Airlines at 13%, and Air Canada at 5%.

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 8,484 reviews	Search Delta flights
Air Canada	PriceFrom $572	Free Cancellation	Rating 7.1 11,427 reviews	Search Air Canada flights
Iberia	PriceFrom $577	Free Cancellation	Rating 7.0 3,267 reviews	Search Iberia flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 10,060 reviews	Search United Airlines flights
British Airways	PriceFrom $581	Free Cancellation	Rating 6.7 8,147 reviews	Search British Airways flights
Scandinavian Airlines	PriceFrom $602	Free Cancellation	Rating 7.4 1,923 reviews	Search Scandinavian Airlines flights
Virgin Atlantic	PriceFrom $615	Free Cancellation	Rating 7.5 694 reviews	Search Virgin Atlantic flights
Lufthansa	PriceFrom $635	Free Cancellation	Rating 6.8 8,176 reviews	Search Lufthansa flights
American Airlines	PriceFrom $637	Free Cancellation	Rating 7.1 11,851 reviews	Search American Airlines flights

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Stansted

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Richmond

Uxbridge

Worthing

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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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Flights to Belfast City Airportfrom $666

Cheap flights from St. Louis to London from $322

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 11/18. 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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Delta flights from St. Louis to London Heathrow Airport

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

United Airlines flights from St. Louis to London Heathrow Airport

Our best United Airlines 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?

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

Traveling to a place near London?

Why use momondo?

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List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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