STL - LHR

£259 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 28/3. 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
Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£524
Typical prices: £474-£637
Lufthansa
Wed 19/8Fri 28/8
STL - LHR • 1 stop
Cheapest direct flights
£543
British Airways
Wed 2/9Wed 9/9
STL - LHR • Direct
Direct flights
Tue, Wed, Fri, Sun
You can fly direct with British Airways. Average duration is 0
Direct flights
Direct flights
+1
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Direct flights
Direct flights
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Top airlines
Cheapest • from £524 (return)
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
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Top stopover airports
Cheapest • Avg £547 (return)
Shortest trip • 10h 37m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 13% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 20% price drop
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
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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

Wed, 19 Aug - Fri, 28 Aug
Lufthansa Logo
15:30 - 12:40
STL
-
LHR
15h 10m
1 stop
Lufthansa Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£524Lufthansa
Sun, 3 May - Tue, 12 May
Virgin Atlantic Logo
16:41 - 13:15
STL
-
LHR
14h 34m
1 stop
Virgin Atlantic Logo
06:15 - 17:16
LHR
-
STL
17h 01m
2 stops
£527Virgin Atlantic
Tue, 8 Sep - Wed, 16 Sep
Lufthansa Logo
13:18 - 14:40
STL
-
LHR
19h 22m
2 stops
Lufthansa Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£527Lufthansa
Tue, 7 Apr - Tue, 14 Apr
Lufthansa Logo
18:55 - 18:25
STL
-
LHR
17h 30m
2 stops
Lufthansa Logo
19:30 - 13:25
LHR
-
STL
23h 55m
1 stop
£533Lufthansa
Wed, 6 May - Wed, 13 May
Air Canada Logo
13:00 - 06:30
STL
-
LHR
11h 30m
1 stop
Air Canada Logo
06:50 - 20:25
LHR
-
STL
19h 35m
2 stops
£535Air Canada
Wed, 22 Apr - Wed, 29 Apr
KLM Logo
17:35 - 13:05
STL
-
LHR
13h 30m
1 stop
KLM Logo
11:45 - 23:36
LHR
-
STL
17h 51m
2 stops
£536KLM
Mon, 30 Mar - Fri, 1 May
Air Canada Logo
06:30 - 10:00
STL
-
LHR
21h 30m
2 stops
Air Canada Logo
06:00 - 20:25
LHR
-
STL
20h 25m
2 stops
£536Air Canada
Mon, 17 Aug - Mon, 24 Aug
Lufthansa Logo
15:30 - 10:40
STL
-
LHR
13h 10m
1 stop
Lufthansa Logo
19:30 - 13:25
LHR
-
STL
23h 55m
1 stop
£538Lufthansa
Sun, 19 Apr - Thu, 30 Apr
Lufthansa Logo
15:30 - 17:40
STL
-
LHR
20h 10m
1 stop
Lufthansa Logo
20:25 - 13:25
LHR
-
STL
23h 00m
2 stops
£539Lufthansa
Wed, 2 Sep - Wed, 9 Sep
Air Canada Logo
09:16 - 06:30
STL
-
LHR
15h 14m
2 stops
Air Canada Logo
17:15 - 18:41
LHR
-
STL
31h 26m
2 stops
£539Air Canada
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 August.

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 Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday 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 Fridays 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 £501 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £969 and £746 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.

No, with an average price for the route of £604, prices are generally cheapest when you fly direct.

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 2 weeks before departure, which saves you about 13% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

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

Low seasonJanuary
Cheapest flight£259
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly (16% 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 £259 for a one-way ticket and £524 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?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between St. Louis and London Heathrow Airport, with Star Alliance 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 Sunday.

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

    The two airlines most popular with KAYAK users for flights from St. Louis to London are Virgin Atlantic and United Airlines. With an average price for the route of £583 and an overall rating of 7.5, Virgin Atlantic is the most popular choice. United Airlines is also a great choice for the route, with an average price of £679 and an overall rating of 7.4.

  • 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 3 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.
7.5
Virgin AtlanticOverall score based on 680 reviews
7.3Comfort
8.2Crew
6.9Food
7.6Entertainment
7.7Boarding
Airline reviews

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

8.0 ExcellentAditya, Feb 2026
LHR - JFK
Read more Virgin Atlantic reviews

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

Great crew - old style upper class seats on the older fleet now feels dated

Wifi Bluetooth features for watching in flight movie was horrible. Screen kept blacking out no connection of sound although it said connected. Other than that smooth trip .

The 777’s economy seat’s legroom was more tolerable than expected. I appreciate the reclining mechanism which slides the seat forward to minimize cannibalizing the space behind. The food was terrible: very salty.

The travel company that you have on your site did me so wrong. I don’t know how it happened, but they put my son‘s name on my plane ticket flying to Vietnam. Along with his birthday. They would not have let me fly from Fort Myers to Ho Chi Minh City. I don’t think that I can ever use your service again. I typed my information into the browser along with my passport number and four days before I’m leaving I have to quickly search another ticket to fly out here.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

It’s always a great time flying with united airlines.

Good flight. Efficient boarding and competent flight crew. No problems until we arrived at our destination gate. We were early so there was an aircraft at the gate that had to move before we could pull in. Then, due to the type of aircraft we flew, the cabin door could not be opened until some luggage from the cargo bay was offloaded to preserve center of gravity characteristics. So, that further delayed deplaning. Despite being 20 minutes early on landing, we ended up being 5 to 10 minutes late after all the delays.

Everything went well except the turbulence what no one have a control of but pilot and crew handled very good!

There was no WiFi available, there were mechanical problems with the plane and we landed at C 124, then the gate was switched to A 26, then all the way back to C126! For a 75 yo woman traveling alone, this was a difficult journey, indeed!

This trip did not start off well. The inbound flight was delayed about 20 minutes. Then, after initial onboarding, the passengers had to deplane due to a mechanical problem. That took about 30 minutes to fix and be cleared. Then, reboarding was chaotic. It took a long time to sort passengers and two passengers on standby were ticketed but there was no seat. So, they had to deplane. One of the flight crew was trying to help passengers figure out a place to put their carry-on bags and that took more time. In the end, our scheduled 10:30 am departure did not actually take off until about 12:05 pm CST. The flight itself was long but we got to Houston. Some passengers missed their connecting flights and had to rebook. Not the best of flights I've had.

Worth every penny to upgrade to BC. Treated and felt more like First Class

Good service, food and comfort in World Traveller Plus. Entertainment was poor - no wifi on the way out and barely working on the way back. Not a great choice of entertainment on the seat back tv.

They had us seating down for one hour just waiting on the plane

Flying with BA is always a good experience—even in economy class. It is better if in business and first class. Timely, breeze through security and timely connections

We waited at BOS at the gate for an hour and couldn’t get a drink or anything. Once in the air the service, food and ride was excellent.

My enetertainmnet screen was broken. Lost my bags. Almost missed my flight do to connection issues with (despite a request) ZERO help from crew. Food was edible. Potatoes pretty good even

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.

Awful it always is unfortunately is the only way to fly direct to london

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

Information on your arrival and departure airports