STL - LHR

£231 Find Cheap Flights from St. Louis to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Heathrow departing on 9/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to London, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£634
Typical prices: £556-£429
Iberia
tir. 13/10tir. 27/10
STL - LHR • Direct
Cheapest direct flights
£642
British Airways
tir. 6/10ons. 14/10
STL - LHR • Direct
Direct flights
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 8h 00m
Direct flights
Direct flights
+1
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Direct flights
Direct flights
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Top airlines
Cheapest • from £634 (return)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Top stopover airports
Cheapest • Avg £540 (return)
Shortest trip • 10h 37m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Heathrow (STL-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from St. Louis to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from St. Louis to Heathrow

tir., 13 okt. - tir., 27 okt.
Iberia Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
Iberia Logo
07:30 - 20:08
LHR
-
STL
17h 38m
2 stops
£634Iberia
søn., 20 sep. - man., 28 sep.
Iberia Logo
21:40 - 11:40
STL
-
LHR
8h 00mdirect
Iberia Logo
19:25 - 20:03
LHR
-
STL
30h 38m
2 stops
£637Iberia
tir., 13 okt. - tor., 29 okt.
Iberia Logo
18:51 - 12:50
STL
-
LHR
11h 59m
1 stop
Iberia Logo
07:30 - 20:08
LHR
-
STL
17h 38m
2 stops
£638Iberia
ons., 7 okt. - tor., 15 okt.
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
British Airways Logo
07:50 - 20:08
LHR
-
STL
18h 18m
2 stops
£640British Airways
ons., 7 okt. - tor., 15 okt.
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
British Airways Logo
07:50 - 20:08
LHR
-
STL
18h 18m
2 stops
£641British Airways
tir., 6 okt. - tir., 13 okt.
Delta Logo
11:51 - 07:15
STL
-
LHR
13h 24m
1 stop
Delta Logo
06:30 - 18:01
LHR
-
STL
17h 31m
2 stops
£641Delta
tir., 6 okt. - tir., 13 okt.
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
£642British Airways
søn., 27 sep. - ons., 30 sep.
Multiple Airlines Logo
21:40 - 11:40
STL
-
LHR
8h 00mdirect
Multiple Airlines Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£644Multiple Airlines
tir., 6 okt. - ons., 14 okt.
Delta Logo
11:51 - 07:10
STL
-
LHR
13h 19m
2 stops
Delta Logo
06:30 - 16:50
LHR
-
STL
16h 20m
2 stops
£644Delta
tir., 6 okt. - tir., 13 okt.
Delta Logo
11:51 - 07:10
STL
-
LHR
13h 19m
2 stops
Delta Logo
06:30 - 16:50
LHR
-
STL
16h 20m
2 stops
£645Delta
Booking Insights

KAYAK’s insights & trends for St. Louis to Heathrow flights

Get data-powered insights and trends into flights from St. Louis to Heathrow to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from St. Louis to London Heathrow Airport?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to London Heathrow Airport departing in October.

What’s the cheapest day of the week to fly from St. Louis to London Heathrow Airport?

The average price of all round-trip flights from St. Louis to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to London Heathrow Airport on a Friday, as we generally find the cheapest rates on that day for this route. On the other hand, Tuesday is the most expensive day to fly from St. Louis to London Heathrow Airport. For your return ticket, we recommend flying on a Saturday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to London Heathrow Airport is October, where tickets cost £486 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £981 and £749 respectively.

Can I save money by flying with a stopover from St. Louis to London Heathrow Airport?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £704 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to London Heathrow Airport, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know - Cheap tickets from St. Louis to London Heathrow Airport

Low seasonJanuary
Cheapest flight£231
Most popular time to fly (17% more expensive on average)
Flight from St. Louis to London Heathrow Airport

When to book flights from St. Louis to Heathrow

Are your dates flexible? Find out the best times to travel from St. Louis to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking St. Louis to London Heathrow Airport flights

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

    In the last 3 days, the lowest price for a flight from St. Louis to London Heathrow Airport was £231 for a one-way ticket and £634 for a return.

  • Which airports will I be using when flying from St. Louis to London Heathrow Airport?

    On your way to London Heathrow Airport, you’ll fly out from Lambert-St Louis. You’ll be landing at London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to London Heathrow Airport?

    American Airlines, Lufthansa, and United Airlines offer inflight Wi-Fi service on the St. Louis to London Heathrow Airport flight route.

  • Which aircraft models fly most regularly from St. Louis to London Heathrow Airport?

    The Boeing 787-8 Dreamliner is the aircraft model that flies most regularly on the St. Louis to London Heathrow Airport flight route.

  • Which airline alliances offer flights from St. Louis to London Heathrow Airport?

    SkyTeam, and oneworld are the airline alliances operating flights between St. Louis and London Heathrow Airport, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from St. Louis to London Heathrow Airport?

    You can catch a direct flight from St. Louis to London Heathrow Airport on Tuesday, Wednesday, Friday, and Sunday.

  • Which is the best airline for flights from St. Louis to London, Virgin Atlantic or British Airways?

    The two airlines most popular with KAYAK users for flights from St. Louis to London are Virgin Atlantic and British Airways. With an average price for the route of £558 and an overall rating of 7.4, Virgin Atlantic is the most popular choice. British Airways is also a great choice for the route, with an average price of £655 and an overall rating of 6.7.

  • How does KAYAK find such low prices on flights from St. Louis to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from St. Louis is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to St. Louis with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from St. Louis to London Heathrow Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to London Heathrow.
Find which airlines fly direct from Lambert-St Louis Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to London Heathrow

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Friday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Direct returns

London Heathrow to Lambert-St Louis

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Friday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Reviews of the top airlines flying from St. Louis to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
Virgin AtlanticOverall score based on 688 reviews
6.9Food
7.7Boarding
7.3Comfort
7.5Entertainment
8.1Crew
Airline reviews

Seating and zone. The minor I went with didn’t even seat close to me

4.0 OkayAnonymous, Mar 2026
BOS - LIS
Read more Virgin Atlantic reviews

Seating and zone. The minor I went with didn’t even seat close to me

My seat 3G did not go down fully and the buttons were not working properly

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

The whole experience was excellent, O can say out from Miami the best airline to travel with for any European destination. Since the ground staff to the inflight crew attention was great, service on board 10 of 10. Finally the 380 is very confortable and nice to travel.

All crew except 1 were excellent. When I asked assistance with business class seat conversion to a bed (not being familiar as never used before but have numerous times with other airlines) crew member helped very reluctantly. I should have told her that business class seat conversion is totally different in each airline such as Delta, New Zealand Air and United. Sorry it was my 1st time with America Airlines. Now I know, I won't bother asking assistance in future.

The seats in Premier Economy were very comfortable. The food was better than average. The way British Airways handled our seating was atrocious.

Flight delayed, connection was not at gate listed and so missed, staff were rude at Heathrow, phone tree stupid and difficult, took me 21 actual hours to reach my destination. Almost lost my hotel reservation after walking in a strange city alone after midnight because they would not put me up in a hotel at sfo or heathrow. I will never fly BA again and will tell all people and Instagram followers never to fly BA.

Overall ok. Best part has always been the sundae dessert.

I’ve never been on a trans-Atlantic (or Pacific) flight where the seats don’t recline—not even a little. I asked my seat mate when BA starting doing this and he said “Oh, a few years ago.” I couldn’t sleep, with my head falling forward waking me continuously, and came off the plane incredibly stiff. I booked a Premium Economy seat to get a more comfortable seat, which was worse than most basic Economy seats I’ve ever booked.

Nice aircraft. Good crew. Delayed departure from Houston, but arrived on time in London. Main thing I don’t like about flying BA is having to transit through security in London Heathrow. A major pain!

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

Wish the food and overall service was better. They treat Business class passengers same as economy

Everything you need to know for your flight from St. Louis to Heathrow

Information on your arrival and departure airports