$349+ Cheap flights from St. Louis (STL) to Heathrow (LHR)
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 3/29. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Apr 10 — Apr 171
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Heathrow with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or April, booked 50 days in advance, depart on a Monday or Thursday and return on a Monday
Cheap flight deals from St. Louis to Heathrow
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to HeathrowExplore 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 March 11, 2026.
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 March 11, 2026.
This Gotogate deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1412:10 pm
STL
- LHR
2 stops14h 25m
Multiple Airlines
Wed 10/216:30 am
LHR
- STL
1 stop12h 55m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$694
This Cheapflightsfares deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:49 pm
STL
- LHR
2 stops18h 51m
Lufthansa
Fri 10/166:30 am
LHR
- STL
1 stop12h 55m
Lufthansa
Deal found 3/7![Lufthansa logo]()
$695
This Gotogate deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:10 pm
STL
- LHR
1 stop12h 20m
Multiple Airlines
Fri 10/166:30 am
LHR
- STL
1 stop12h 55m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$699
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/23:30 pm
STL
- LHR
1 stop19h 10m
Lufthansa
Wed 9/97:25 am
LHR
- STL
2 stops19h 57m
Lufthansa
Deal found 3/6![Lufthansa logo]()
$700
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/63:30 pm
STL
- LHR
1 stop17h 10m
Lufthansa
Fri 10/166:30 am
LHR
- STL
1 stop12h 55m
Lufthansa
Deal found 3/6![Lufthansa logo]()
$701
This Ticket deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/312:27 pm
STL
- LHR
1 stop13h 38m
Finnair
Tue 5/123:15 pm
LHR
- STL
1 stop13h 04m
Finnair
Deal found 3/10![Finnair logo]()
$704
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1010:00 am
STL
- LHR
1 stop14h 55m
United Airlines
Tue 3/176:50 am
LHR
- STL
2 stops19h 17m
United Airlines
Deal found 3/6![United Airlines logo]()
$708
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/213:30 pm
STL
- LHR
1 stop19h 10m
Lufthansa
Wed 9/306:30 am
LHR
- STL
2 stops15h 08m
Lufthansa
Deal found 3/6![Lufthansa logo]()
$710
This Booking.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:45 am
STL
- LHR
2 stops18h 50m
Air Canada
Wed 5/136:50 am
LHR
- STL
2 stops19h 35m
Air Canada
Deal found 3/7![Air Canada logo]()
$712
This Cheapflightsfares deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:55 pm
STL
- LHR
2 stops18h 45m
Lufthansa
Mon 8/247:30 pm
LHR
- STL
1 stop23h 55m
Lufthansa
Deal found 3/9![Lufthansa logo]()
$713
Best flights from St. Louis to HeathrowDiscover carefully curated flight deals from St. Louis to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
Discover carefully curated flight deals from St. Louis to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:15 am
STL
- LHR
1 stop15h 45m
United Airlines
Thu 4/166:50 am
LHR
- STL
2 stops14h 58m
United Airlines
Deal found 3/8![United Airlines logo]()
$723
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/305:25 pm
STL
- LHR
1 stop13h 40m
Delta
Fri 4/106:30 am
LHR
- STL
2 stops16h 35m
Delta
Deal found 3/6![Delta logo]()
$724
This Scandinavian Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/21:03 pm
STL
- LHR
2 stops26h 37m
Scandinavian Airlines
Tue 5/57:05 am
LHR
- STL
3 stops22h 31m
Scandinavian Airlines
Deal found 3/9![Scandinavian Airlines logo]()
$759
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1310:50 am
STL
- LHR
2 stops16h 00m
Delta
Tue 4/289:55 am
LHR
- STL
2 stops17h 24m
Delta
Deal found 3/6![Delta logo]()
$728
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/304:49 pm
STL
- LHR
1 stop33h 06m
United Airlines
Tue 4/142:10 pm
LHR
- STL
1 stop31h 15m
United Airlines
Deal found 3/6![United Airlines logo]()
$738
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:30 am
STL
- LHR
1 stop23h 25m
United Airlines
Thu 4/305:40 pm
LHR
- STL
1 stop32h 24m
United Airlines
Deal found 3/8![United Airlines logo]()
$738
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:56 pm
STL
- LHR
1 stop11h 14m
Delta
Thu 5/216:30 am
LHR
- STL
2 stops16h 35m
Delta
Deal found 3/9![Delta logo]()
$774
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/297:45 am
STL
- LHR
1 stop17h 00m
United Airlines
Thu 5/72:05 pm
LHR
- STL
1 stop12h 20m
United Airlines
Deal found 3/6![United Airlines logo]()
$746
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/104:20 pm
STL
- LHR
1 stop12h 00m
Delta
Thu 5/218:40 am
LHR
- STL
2 stops20h 41m
Delta
Deal found 3/9![Delta logo]()
$774
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/510:09 am
STL
- LHR
1 stop15h 36m
United Airlines
Wed 4/158:30 am
LHR
- STL
1 stop12h 55m
United Airlines
Deal found 3/8![United Airlines logo]()
$750
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/104:20 pm
STL
- LHR
1 stop12h 00m
Delta
Tue 5/196:30 am
LHR
- STL
2 stops14h 01m
Delta
Deal found 3/9![Delta logo]()
$774
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/134:20 pm
STL
- LHR
1 stop13h 45m
Delta
Thu 5/216:30 am
LHR
- STL
2 stops22h 51m
Delta
Deal found 3/9![Delta logo]()
$774
Last-minute flights from St. Louis to HeathrowDiscover last-minute flight deals from St. Louis to Heathrow. Data last updated March 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Heathrow. Data last updated March 11, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1010:00 am
STL
- LHR
1 stop14h 55m
United Airlines
Tue 3/176:50 am
LHR
- STL
2 stops19h 17m
United Airlines
Deal found 3/6![United Airlines logo]()
$708
This Gotogate deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/304:05 pm
STL
- LHR
1 stop13h 45m
Multiple Airlines
Fri 5/16:30 am
LHR
- STL
1 stop12h 55m
Multiple Airlines
Deal found 3/8![Multiple Airlines logo]()
$715
This Cheapflightsfares deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/76:55 pm
STL
- LHR
2 stops17h 30m
Lufthansa
Tue 4/147:30 pm
LHR
- STL
1 stop23h 55m
Lufthansa
Deal found 3/8![Lufthansa logo]()
$713
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:15 am
STL
- LHR
1 stop15h 45m
United Airlines
Thu 4/166:50 am
LHR
- STL
2 stops14h 58m
United Airlines
Deal found 3/8![United Airlines logo]()
$723
This Cheapflightsfares deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/193:30 pm
STL
- LHR
1 stop19h 10m
Lufthansa
Thu 4/307:30 pm
LHR
- STL
1 stop23h 55m
Lufthansa
Deal found 3/6![Lufthansa logo]()
$719
This Mytrip deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/214:05 pm
STL
- LHR
1 stop10h 30m
Multiple Airlines
Tue 4/286:30 pm
LHR
- STL
1 stop24h 55m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$714
This Booking.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:45 am
STL
- LHR
2 stops18h 50m
Air Canada
Wed 5/136:50 am
LHR
- STL
2 stops19h 35m
Air Canada
Deal found 3/7![Air Canada logo]()
$712
This Expedia deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/225:35 pm
STL
- LHR
1 stop13h 30m
KLM
Wed 4/2911:45 am
LHR
- STL
2 stops17h 51m
KLM
Deal found 3/8![KLM logo]()
$716
This FlightHub deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/274:05 pm
STL
- LHR
2 stops22h 55m
Air Canada
Wed 5/68:40 am
LHR
- STL
2 stops17h 45m
Air Canada
Deal found 3/6![Air Canada logo]()
$722
This Air Canada deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:21 am
STL
- LHR
2 stops18h 14m
Air Canada
Fri 5/86:50 am
LHR
- STL
2 stops19h 35m
Air Canada
Deal found 3/6![Air Canada logo]()
$717
This Air Canada deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/294:05 pm
STL
- LHR
1 stop13h 45m
Air Canada
Thu 5/76:50 am
LHR
- STL
2 stops19h 35m
Air Canada
Deal found 3/6![Air Canada logo]()
$721
One-way flights from St. Louis to HeathrowSearch for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/297:52 am
STL
- LHR
3 stops30h 03m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/284:21 pm
STL
- LHR
3 stops42h 39m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$351
This Trip.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:30 pm
STL
- LHR
2 stops23h 30m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/28:23 pm
STL
- LHR
3 stops59h 52m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$371
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:13 pm
STL
- LHR
3 stops40h 37m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$382
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/68:13 pm
STL
- LHR
3 stops38h 12m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$389
This Kiwi.com deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/277:47 am
STL
- LHR
3 stops54h 08m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$399
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/711:21 am
STL
- LHR
3 stops23h 04m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$403
Find 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 March 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $700 (Cheapflightsfares) |
One-way from | $349 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $778 |
Good round-trip deal | $856 or less |
Good one-way deal | $444 or less |
Cheapflights Fare Finder
Customize 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 2,558,603 searches. Data last updated March 11, 2026.
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
Cheapest round-trip
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Tue 4/7
11:15 am-9:00 am
1 stop15h 45m
London Heathrow
Thu 4/16
6:50 am-3:48 pm
2 stops14h 58m
$723
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Mon 3/30
5:25 pm-1:05 pm
1 stop13h 40m
London Heathrow
Fri 4/10
6:30 am-5:05 pm
2 stops16h 35m
$724
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Mon 4/13
10:50 am-8:50 am
2 stops16h 00m
London Heathrow
Tue 4/28
9:55 am-9:19 pm
2 stops17h 24m
$728
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Mon 3/30
4:49 pm-7:55 am
1 stop33h 06m
London Heathrow
Tue 4/14
2:10 pm-3:25 pm
1 stop31h 15m
$738
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Tue 4/21
6:30 am-11:55 am
1 stop23h 25m
London Heathrow
Thu 4/30
5:40 pm-8:04 pm
1 stop32h 24m
$738
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Wed 4/29
7:45 am-6:45 am
1 stop17h 00m
London Heathrow
Thu 5/7
2:05 pm-8:25 pm
1 stop12h 20m
$746
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sun 4/5
10:09 am-7:45 am
1 stop15h 36m
London Heathrow
Wed 4/15
8:30 am-3:25 pm
1 stop12h 55m
$750
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sat 5/2
1:03 pm-9:40 pm
2 stops26h 37m
London Heathrow
Tue 5/5
7:05 am-11:36 pm
3 stops22h 31m
$759
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Tue 5/12
1:56 pm-7:10 am
1 stop11h 14m
London Heathrow
Thu 5/21
6:30 am-5:05 pm
2 stops16h 35m
$774
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
Sun 5/10
4:20 pm-10:20 am
1 stop12h 00m
London Heathrow
Thu 5/21
8:40 am-11:21 pm
2 stops20h 41m
$774
Showing 1-10 of 24 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Heathrow
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Heathrow in March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on St. Louis-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-London Heathrow Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
STL-LHR
Estimated round-trip 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 round-trip flight from St. Louis to Heathrow. Price data was last updated on March 6, 2026.
To ensure you get the cheapest price possible for a flight from St. Louis to London Heathrow Airport, you should look to book at least 50 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?
Currently, April is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $514). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,020). 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.
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 March 11, 2026.
Get a feel of what it's like to fly with United Airlines,American Airlines, andAir Canada from St. Louis to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
6.6
Overall
7.4
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Food
6.6
Overall
7.4
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Food
6.6
Overall
7.4
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Food
6.6
Overall
7.4
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Food
6.6
Overall
7.4
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
Food
6.6
Overall
7.4
Entertainment
7.1
Crew
8.1
Boarding
7.7
Comfort
7.3
Reviews
1 / 20
10.0
ExcellentDane,Jan 2026
TYS - IAD
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.
Traveling to a place near London Heathrow Airport?
Book flights to London Heathrow Airport if you plan to visit one of these locationsIlford
Hounslow
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Borehamwood
Broadway
Aylesbury
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
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Other flights to Heathrow
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on March 11, 2026.
St. Louis and Heathrow flights
Browse other St. Louis and Heathrow flight options. Last updated on March 11, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on March 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 9 airlines flying from St. Louis to Heathrow
Discover the top 9 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 2,558,603 searches. Data last updated March 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$529 | Average$643 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$538 | Average$810 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$563 | Average$884 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$572 | Average$899 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$577 | Average$852 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$580 | Average$907 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$580 | Average$844 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$602 | Average$1,102 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$635 | Average$888 | FlexibilityNo cancel fee | On-time76% |