What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

According to our current data, Finnair ($730), Air Canada ($736), and United Airlines ($740) offers the cheapest pricing from St. Louis to London Heathrow Airport. Finnair is 18% cheaper than the average price of flights available within the next 90 days to this destination.

What are the cheapest airlines to fly from St. Louis to London Heathrow Airport one-way?

For one-way options, check prices for Scandinavian Airlines. According to our data, you can fly for as low as $494. Users have also found prices from $640 and $692 on Finnair and Air Canada, respectively.

What are the most popular airlines that fly from St. Louis to London Heathrow Airport?

The most popular airlines flying from St. Louis to London Heathrow Airport are American Airlines, Air Canada and Air France. Something to consider prior to booking your flight.

Can I find flights from St. Louis to London Heathrow Airport for under $800 on Cheapflights?

Yes, there are multiple flights from St. Louis to London Heathrow Airport for under $800. The cheapest flight booked recently is on Finnair for just $730, but on average you can expect to pay $750.

Are there last-minute flights available from St. Louis to London Heathrow Airport for under $2,100?

There are currently 7+ open flights from St. Louis to London Heathrow Airport within the next 7 days for less than $2,100.

Which airlines flying from Lambert-St Louis to London Heathrow have flexible cancellations due to COVID-19?

Some of the carriers operating flights from Lambert-St Louis to London Heathrow that may be offering flexible cancellation policies are American Airlines, British Airways, and United Airlines. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.

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

Find a great deal and save up to 76% by booking at least 51 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at $1,273.

What is the cheapest month to fly from St. Louis to London Heathrow Airport?

Flights from St. Louis to London Heathrow Airport lean towards being more expensive in July. Prices are generally better when you fly from St. Louis to London Heathrow Airport in February, with the cheapest ticket starting at $657.

When is the cheapest time to fly from St. Louis to London Heathrow Airport (STL - LHR)?

When flying from St. Louis to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from St. Louis to London Heathrow?

Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to London Heathrow from St. Louis. Booking flights from Lambert-St Louis (STL) to London Heathrow should be relatively easy as there are 0 daily outbound flights to London Heathrow from 11 different airlines.

What does STL to LHR mean?

This is defined as Lambert-St Louis Airport (STL) and London Heathrow Airport (LHR). Codes like London Heathrow Airport are often used to just call airports uniquely.

Flights from St. Louis, MO to London Heathrow Airport (LHR) from $488

How to find the cheapest flight from St. Louis (STL) to Heathrow (LHR)

Popular in	July
Cheapest in	February
Round-trip from	$633
One-way from	$494

High demand for flights, 30% potential price rise

Search Deals

Best time to find cheap flights, 20% potential price drop

Search Deals

From Lambert-St Louis to London Heathrow

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One-way flight from Lambert-St Louis to London Heathrow

Search Deals

STL - LON Price	$633 - $1,115
LON Temperature	39.2 - 62.6 °F
LON Rainfall	1.6 - 2.8 inches

STL - LON

Price

$633 - $1,115

LON

Temperature

39.2 - 62.6 °F

LON

Rainfall

1.6 - 2.8 inches

Cheap flights from St. Louis to Heathrow in June, July 2023

Scroll through some of the best deals on flights from St. Louis to London in 2023. Check back soon for alternative fares.

Jul 24 - Aug 15

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

10h 33m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

17h 45m

$941

Finnair

Deal found 5/31

Jul 17 - Jul 27

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

21h 07m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

27h 06m

$946

United Airlines

Deal found 6/1

Jul 17 - Jul 25

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

14h 30m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

24h 24m

$951

United Airlines

Deal found 6/1

Jul 17 - Aug 17

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

23h 20m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

32h 01m

$952

Multiple Airlines

Deal found 5/30

Jul 18 - Aug 18

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

18h 00m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

14h 26m

$958

Air Canada

Deal found 5/31

Jul 25 - Aug 16

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

12h 48m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

13h 40m

$959

Finnair

Deal found 5/31

Jul 19 - Aug 17

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

15h 30m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

31h 01m

$962

Multiple Airlines

Deal found 5/30

Jul 19 - Aug 17

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 55m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

26h 26m

$963

Air Canada

Deal found 5/31

Jul 22 - Aug 18

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

32h 40m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

30h 46m

$964

Air Canada

Deal found 5/31

St. Louis to Heathrow 2023 flight deals

Scroll through some of the best deals on flights from St. Louis to London in 2023. Check back soon for alternative fares.

Oct 16 - Oct 26

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

10h 40m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

20h 25m

$730

Finnair

Deal found 5/31

Oct 14 - Oct 26

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

32h 00m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

20h 25m

$735

Finnair

Deal found 5/30

Oct 11 - Oct 18

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

12h 45m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

16h 56m

$736

Air Canada

Deal found 5/31

Sep 19 - Oct 4

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

16h 30m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

27h 20m

$740

United Airlines

Deal found 5/31

Sep 19 - Oct 4

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

10h 05m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

27h 20m

$741

United Airlines

Deal found 5/31

Oct 11 - Oct 18

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

14h 20m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

26h 22m

$746

United Airlines

Deal found 6/1

Oct 18 - Oct 24

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

15h 00m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

16h 40m

$747

KLM

Deal found 5/31

Oct 18 - Oct 25

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

13h 55m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

17h 35m

$748

Air France

Deal found 5/31

Nov 15 - Nov 28

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

12h 07m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

14h 58m

$749

Air France

Deal found 6/1

Cheap Air Canada flights from St. Louis to Heathrow

Find some of the cheapest Air Canada flights traveling from St. Louis to London. Deals update often to give you more flight options matching your criteria

Oct 11 - Oct 18

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

12h 45m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

16h 56m

$736

Air Canada

Deal found 5/31

Oct 18 - Oct 27

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

13h 55m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

14h 26m

$758

Air Canada

Deal found 5/31

Sep 11 - Oct 11

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

10h 05m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

16h 56m

$761

Air Canada

Deal found 5/31

Sep 30 - Oct 12

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

30h 40m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

24h 17m

$764

Air Canada

Deal found 5/31

Sep 12 - Oct 10

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

17h 53m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

14h 26m

$777

Air Canada

Deal found 5/31

Sep 13 - Oct 11

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

12h 50m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

28h 26m

$783

Air Canada

Deal found 5/31

Sep 10 - Sep 20

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

10h 05m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

22h 31m

$784

Air Canada

Deal found 6/1

Oct 13 - Oct 27

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 55m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

16h 56m

$786

Air Canada

Deal found 5/30

Oct 15 - Oct 25

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 55m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

16h 06m

$787

Air Canada

Deal found 5/31

Cheap British Airways flights from St. Louis to Heathrow

Take a gander at the lowest prices we've found on British Airways flights from St. Louis to London. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.

Oct 18 - Oct 25

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

10h 10m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

17h 42m

$752

British Airways

Deal found 5/31

Jun 10 - Jun 14

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 00m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

30h 57m

$2,076

British Airways

Deal found 5/31

Jun 10 - Jun 14

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 00m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

13h 48m

$2,093

British Airways

Deal found 5/31

Jun 11 - Jun 26

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

20h 57m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

33h 24m

$2,353

British Airways

Deal found 6/1

Last minute flights from St. Louis to Heathrow

Have a look at some of the last-minute flights available departing from St. Louis to London. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.

Jun 10 - Jun 14

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 00m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

30h 57m

$2,076

British Airways

Deal found 5/31

Jun 10 - Jun 14

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

11h 00m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

13h 48m

$2,093

British Airways

Deal found 5/31

Jun 10 - Jun 14

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

36h 52m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

28h 52m

$2,115

Turkish Airlines

Deal found 5/31

Jun 11 - Jun 26

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

20h 57m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

33h 24m

$2,353

British Airways

Deal found 6/1

Jun 11 - Jun 26

STL

Lambert-St Louis

LHR

London Heathrow

1 stop

17h 54m

LHR

London Heathrow

STL

Lambert-St Louis

1 stop

35h 20m

$2,752

Finnair

Deal found 6/1

Jun 11 - Jun 26

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

17h 29m

LHR

London Heathrow

STL

Lambert-St Louis

2 stops

25h 11m

$2,840

Lufthansa

Deal found 6/1

Jun 10 - Jun 14

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

22h 55m

LHR

London Heathrow

STL

Lambert-St Louis

3 stops

29h 12m

$4,280

Scandinavian Airlines

Deal found 5/31

One-way flights to Heathrow from St. Louis

Users in need of a one-way flight from St. Louis to London can choose from these deals. Users needing a return flight from St. Louis to London should utilize the search form above.

Jul 17

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

44h 22m

$488

Multiple Airlines

Deal found 5/30

Aug 17

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

19h 50m

$491

Multiple Airlines

Deal found 5/31

Oct 1

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

46h 02m

$494

Scandinavian Airlines

Deal found 6/1

Oct 1

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

33h 00m

$533

Multiple Airlines

Deal found 6/1

Aug 15

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

38h 50m

$543

Multiple Airlines

Deal found 6/1

Aug 28

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

19h 50m

$558

Multiple Airlines

Deal found 5/31

Aug 23

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

23h 45m

$581

Multiple Airlines

Deal found 6/1

Jun 21

STL

Lambert-St Louis

LHR

London Heathrow

3 stops

45h 27m

$598

Multiple Airlines

Deal found 5/31

Aug 28

STL

Lambert-St Louis

LHR

London Heathrow

2 stops

33h 01m

$621

Multiple Airlines

Deal found 5/31

Find flights from St. Louis to Heathrow within your budget

Fly from

Fly to

Budget

$730 - $760

Route

Depart

Return

Price

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Mon 10/16

1 stop10h 40m

London Heathrow

Thu 10/26

2 stops20h 25m

$730

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/11

2 stops12h 45m

London Heathrow

Wed 10/18

2 stops16h 56m

$736

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/19

2 stops16h 30m

London Heathrow

Wed 10/4

2 stops27h 20m

$740

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/18

1 stop15h 00m

London Heathrow

Tue 10/24

2 stops16h 40m

$747

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/18

1 stop13h 55m

London Heathrow

Wed 10/25

2 stops17h 35m

$748

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/4

2 stops14h 00m

London Heathrow

Wed 10/11

2 stops17h 40m

$751

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/18

1 stop10h 10m

London Heathrow

Wed 10/25

2 stops17h 42m

$752

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Mon 10/16

2 stops14h 45m

London Heathrow

Mon 10/23

2 stops25h 30m

$759

Pick Dates

Lambert-St LouisLondon Heathrow

STL - LHR

STLLHR

Lambert-St Louis

Wed 11/15

1 stop12h 36m

London Heathrow

Thu 11/23

1 stop13h 53m

$760

Pick Dates

Flights are sorted by cheapest first

Deals found on 5/31

Reviews of Airlines Servicing Heathrow

Get a feel of what it's like to fly with Air Canada, British Airways and Virgin Atlantic from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

2,369 reviews

Check prices

Reviews

1 / 10

Flights were on time with no delays, luggage arrived with the flight. I know the flights were short, but the only drinks offered were water, tea and coffee. It would’ve been nice to have the option to choose a soda, especially since I was in comfort class. The snacks were very small.

Delta

8.0

Very good

2,369 reviews

Delta

8.0

Very good

2,369 reviews

Check prices

Reviews

1 / 10

Flights were on time with no delays, luggage arrived with the flight. I know the flights were short, but the only drinks offered were water, tea and coffee. It would’ve been nice to have the option to choose a soda, especially since I was in comfort class. The snacks were very small.

Air France

7.6

Good

194 reviews

Delta

8.0

Very good

2,369 reviews

Check prices

Reviews

1 / 10

Flights were on time with no delays, luggage arrived with the flight. I know the flights were short, but the only drinks offered were water, tea and coffee. It would’ve been nice to have the option to choose a soda, especially since I was in comfort class. The snacks were very small.

United Airlines

7.6

Good

1,535 reviews

Delta

8.0

Very good

2,369 reviews

Check prices

Reviews

1 / 10

Flights were on time with no delays, luggage arrived with the flight. I know the flights were short, but the only drinks offered were water, tea and coffee. It would’ve been nice to have the option to choose a soda, especially since I was in comfort class. The snacks were very small.

KLM

7.6

Good

160 reviews

Delta

8.0

Very good

2,369 reviews

Check prices

Reviews

1 / 10

Flights were on time with no delays, luggage arrived with the flight. I know the flights were short, but the only drinks offered were water, tea and coffee. It would’ve been nice to have the option to choose a soda, especially since I was in comfort class. The snacks were very small.

Finnair

7.5

Good

277 reviews

Delta

8.0

Very good

2,369 reviews

Check prices

Reviews

1 / 10

Flights were on time with no delays, luggage arrived with the flight. I know the flights were short, but the only drinks offered were water, tea and coffee. It would’ve been nice to have the option to choose a soda, especially since I was in comfort class. The snacks were very small.

Related info for your journey

Top 10 airlines flying from St. Louis to Heathrow

Airline	Cheapest	Average	Flexibility	On-time	COVID-19 safety
American Airlines	Cheapest$464	Average$927	FlexibilityNo cancel fee	On-time71%	COVID-19 safety	Search American Airlines flights
Lufthansa	Cheapest$573	Average$778	FlexibilityNo cancel fee	On-time76%	COVID-19 safety	Search Lufthansa flights
Air Canada	Cheapest$620	Average$1,175	FlexibilityNo cancel fee	On-time67%	COVID-19 safety	Search Air Canada flights
Virgin Atlantic	Cheapest$632	Average$877	FlexibilityNo cancel fee	On-time72%	COVID-19 safety	Search Virgin Atlantic flights
KLM	Cheapest$658	Average$815	FlexibilityNo cancel fee	On-time75%	COVID-19 safety	Search KLM flights
Delta	Cheapest$659	Average$877	FlexibilityNo cancel fee	On-timeN/A	COVID-19 safety	Search Delta flights
Finnair	Cheapest$660	Average$821	FlexibilityNo cancel fee	On-time76%	COVID-19 safety	Search Finnair flights
Iberia	Cheapest$670	Average$787	FlexibilityNo cancel fee	On-time77%	COVID-19 safety	Search Iberia flights
British Airways	Cheapest$672	Average$1,011	FlexibilityNo cancel fee	On-time70%	COVID-19 safety	Search British Airways flights
Air France	Cheapest$681	Average$1,096	FlexibilityNo cancel fee	On-time77%	COVID-19 safety	Search Air France flights

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Cheap flights from St. Louis (STL) to Heathrow (LHR) from $488

This is the cheapest one-way flight price, found on 5/30. Prices may vary by date and flight preferences.

How to find the cheapest flight from St. Louis (STL) to Heathrow (LHR)

All the information you need to plan the best STL to LHR flight in 2023: compare St. Louis to Heathrow flight prices with the expected peak season, weather and rainfall in Heathrow.

Popular in

Cheapest in

Round-trip from

One-way from

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

What is the cheapest month to fly from St. Louis to London Heathrow Airport?

When is the cheapest time to fly from St. Louis to London Heathrow Airport (STL - LHR)?

Cheap flights from St. Louis to Heathrow in June, July 2023

The best prices found for STL to LHR flights for June, July

Scroll through some of the best deals on flights from St. Louis to London in 2023. Check back soon for alternative fares.

St. Louis to Heathrow 2023 flight deals

Cheap flights to Heathrow from St. Louis found for this year

Scroll through some of the best deals on flights from St. Louis to London in 2023. Check back soon for alternative fares.

Cheap Air Canada flights from St. Louis to Heathrow

Find some of the cheapest Air Canada flights traveling from St. Louis to London. Deals update often to give you more flight options matching your criteria

Cheap British Airways flights from St. Louis to Heathrow

Take a gander at the lowest prices we've found on British Airways flights from St. Louis to London. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.

Last minute flights from St. Louis to Heathrow

Late deals on return flights to Heathrow from St. Louis, departing today and this week

Have a look at some of the last-minute flights available departing from St. Louis to London. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.

One-way flights to Heathrow from St. Louis

The cheapest one-way flights from St. Louis to Heathrow

Users in need of a one-way flight from St. Louis to London can choose from these deals. Users needing a return flight from St. Louis to London should utilize the search form above.

Find flights from St. Louis to Heathrow within your budget

Use the slider to find flights from St. Louis to Heathrow that fit your budget.

Reviews of Airlines Servicing Heathrow

Get a feel of what it's like to fly with Air Canada, British Airways and Virgin Atlantic from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Useful info, stats and facts about St. Louis to Heathrow flights.

What airport do you fly from for flights from St. Louis to London Heathrow?

Which airlines flying from Lambert-St Louis to London Heathrow have flexible cancellations due to COVID-19?

Can I find flights from St. Louis to London Heathrow Airport for under $800 on Cheapflights?

Are there last-minute flights available from St. Louis to London Heathrow Airport for under $2,100?

What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

What are the cheapest airlines to fly from St. Louis to London Heathrow Airport one-way?

What are the most popular airlines that fly from St. Louis to London Heathrow Airport?

What does STL to LHR mean?

Other flights from St. Louis

Other flights to Heathrow

Flights to Heathrow from St. Louis

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Top 10 airlines flying from St. Louis to Heathrow

The chart below displays the airlines Cheapflights users traveling from St. Louis to Heathrow choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

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