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Cheap flights from St. Louis to London Heathrow Airport from £205

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
8 Feb — 15 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from St. Louis to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 9 January 2026.

Round-trip from

£486

One-way from

£205

Popular in

June

Cheapest in

October

Average price

£626
United Airlines
  • United Airlines
  • 5/2-12/2
  • 4 total stops
  • 29h 55m total
  • St. Louis to London
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31/1
  • 31/1
  • 3 total stops
  • 45h 04m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£134 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).
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Average for round-trip flights in January 2026
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Find flight deals from St. Louis to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to Heathrow
Explore the most affordable flight options available from St. Louis to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 January 2026.

Thu 5/209:57STL - LHR
2 stops14h 43mUnited Airlines
Thu 12/206:50LHR - STL
2 stops15h 12mUnited Airlines
Deal found 8/1£486
Sat 21/216:05STL - LHR
1 stop32h 25mMultiple Airlines
Sat 28/219:30LHR - STL
1 stop24h 25mMultiple Airlines
Deal found 7/1£487
Sat 25/416:05STL - LHR
2 stops22h 55mAir Canada
Mon 11/508:40LHR - STL
2 stops17h 25mAir Canada
Deal found 8/1£488
Thu 5/209:59STL - LHR
2 stops16h 46mDelta
Thu 12/206:20LHR - STL
2 stops16h 25mDelta
Deal found 6/1£489
Fri 6/311:25STL - LHR
1 stop14h 30mUnited Airlines
Fri 13/313:00LHR - STL
1 stop31h 29mUnited Airlines
Deal found 8/1£489
Mon 9/218:57STL - LHR
1 stop10h 43mDelta
Mon 23/210:45LHR - STL
1 stop12h 57mDelta
Deal found 7/1£490
Mon 17/808:55STL - LHR
2 stops15h 35mUnited Airlines
Tue 25/806:30LHR - STL
1 stop12h 55mUnited Airlines
Deal found 7/1£491
Fri 20/316:05STL - LHR
2 stops23h 30mUnited Airlines
Thu 26/318:00LHR - STL
1 stop26h 29mUnited Airlines
Deal found 8/1£492
Thu 23/407:05STL - LHR
1 stop17h 45mBritish Airways
Wed 6/512:15LHR - STL
1 stop12h 12mBritish Airways
Deal found 8/1£492
Sun 12/416:05STL - LHR
1 stop13h 45mMultiple Airlines
Sun 26/407:25LHR - STL
2 stops19h 43mMultiple Airlines
Deal found 8/1£493
Wed 25/211:25STL - LHR
1 stop14h 30mUnited Airlines
Sun 1/312:05LHR - STL
2 stops15h 00mUnited Airlines
Deal found 8/1£494
Sun 3/507:45STL - LHR
2 stops16h 50mUnited Airlines
Wed 13/506:30LHR - STL
1 stop12h 55mUnited Airlines
Deal found 7/1£495

Cheapflights Fare Finder

 
Customise your flight search to find flights from St. Louis to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 9 January 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

Fly from

St. Louis

Fly to

Heathrow

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 6/3

06:35-07:05

2 stops18h 30m

London Heathrow

Fri 13/3

06:30-17:53

2 stops16h 23m

£489

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 6/3

11:25-07:55

1 stop14h 30m

London Heathrow

Fri 13/3

13:00-15:29

1 stop31h 29m

£489

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 7/5

07:05-06:50

1 stop17h 45m

London Heathrow

Tue 12/5

12:15-18:27

1 stop12h 12m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 7/3

16:05-20:35

2 stops22h 30m

London Heathrow

Sun 15/3

11:10-15:29

1 stop33h 19m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 7/5

07:05-06:50

1 stop17h 45m

London Heathrow

Thu 14/5

09:45-16:16

1 stop12h 31m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 20/3

16:05-20:35

2 stops23h 30m

London Heathrow

Fri 27/3

09:00-15:29

2 stops35h 29m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 23/4

07:05-06:50

1 stop17h 45m

London Heathrow

Wed 6/5

12:15-18:27

1 stop12h 12m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 4/2

11:23-08:45

2 stops15h 22m

London Heathrow

Sat 21/2

13:05-23:23

2 stops16h 18m

£493

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 1/2

10:19-06:50

2 stops14h 31m

London Heathrow

Sun 15/2

13:00-23:23

2 stops16h 23m

£493

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 12/3

07:41-06:30

2 stops17h 49m

London Heathrow

Thu 19/3

18:00-15:29

1 stop26h 29m

£495

Flights are sorted by cheapest return flights first.

Deals found on 7/1

Showing 1-10 of 22 results
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Best time to book a flight from St. Louis to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from St. Louis with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to London Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from St. Louis to Heathrow. Price data was last updated on 2 January 2026.

The best time to book flights from St. Louis to London Heathrow Airport is 17 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £367). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £744). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from St. Louis to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 9 January 2026.
See what other customers who have flown with Virgin Atlantic, Air Canada, andBritish Airways from St. Louis to London Heathrow Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
678 reviews
Check prices

Boarding

7.7

Entertainment

7.6

Food

6.9

Comfort

7.3

Crew

8.2

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
678 reviews
Virgin Atlantic
7.5
Good
678 reviews
Check prices

Boarding

7.7

Entertainment

7.6

Food

6.9

Comfort

7.3

Crew

8.2

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Air Canada
7.1
Good
10,603 reviews
Virgin Atlantic
7.5
Good
678 reviews
Check prices

Boarding

7.7

Entertainment

7.6

Food

6.9

Comfort

7.3

Crew

8.2

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,659 reviews
Virgin Atlantic
7.5
Good
678 reviews
Check prices

Boarding

7.7

Entertainment

7.6

Food

6.9

Comfort

7.3

Crew

8.2

Overall

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London Heathrow. You should not have trouble finding flights to London Heathrow from Lambert-St Louis; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the St. Louis airport to London Heathrow. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • How long is the flight from St. Louis to London Heathrow Airport?

    For as low as £489, Delta can have you in London Heathrow Airport from St. Louis in 14h 30m. There are 4186 mi between St. Louis and London Heathrow Airport. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Virgin Atlantic, at £409, was found to be the cheapest airline from St. Louis to London Heathrow Airport.Alternate airlines flying return to your destination include British Airways and Air Canada. You may be able to fly from St. Louis to London Heathrow Airport for 35% less than the average price by searching for these airlines.

  • Can I find deals for flights from St. Louis to Heathrow that include hotel bookings?

    Yes. In addition to deals on St. Louis to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Heathrow.

  • Can I find deals for business class flights from St. Louis to Heathrow?

    Yes. Cheapflights offers flight deals from St. Louis to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £367). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £744). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Luton
Croydon
Northampton
Slough
Hounslow
Gatwick
Ilford
Wembley
Brentford
Hayes
Colchester
Watford
Crawley
Swindon
Kingston upon Thames
Bedford
Chelmsford
Eastbourne
Romford

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from St. Louis to Heathrow

Discover the top 3 airlines that operate flights from St. Louis to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 9 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£409Average£580FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£431Average£659FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£435Average£659FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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How does Cheapflights help users find flights from St. Louis to Heathrow?

Cheapflights helps you search for flights from St. Louis to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Heathrow?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from St. Louis to Heathrow.

Can Cheapflights find flights from St. Louis to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from St. Louis to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Heathrow become cheaper?

Not ready to book yet? You can track prices for flights from St. Louis to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.

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