$426 Cheap Flights from London (LHR) to St. Louis (STL)

View $426 flight on Thu, Mar 19, 2026Opens in a new window

Popular airlines from Heathrow Airport (LHR) to St. Louis Lambert Intl. Airport (STL)

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

Prices were available within the past 7 days and start at $426 for one-way flights and $613 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$613 Roundtrip, found 5 days ago
$613
Roundtrip
found 5 days ago
Select American Airlines flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $613 found 5 days ago
Delta
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$613 Roundtrip, found 5 days ago
$613
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $613 found 5 days ago
Iberia
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$613 Roundtrip, found 5 days ago
$613
Roundtrip
found 5 days ago
Select Iberia flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $613 found 5 days ago
Virgin Atlantic
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$613 Roundtrip, found 5 days ago
$613
Roundtrip
found 5 days ago
Select Virgin Atlantic flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $613 found 5 days ago
British Airways
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$613 Roundtrip, found 5 days ago
$613
Roundtrip
found 5 days ago
Select British Airways flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $613 found 5 days ago
Delta
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$619 Roundtrip, found 5 days ago
$619
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $619 found 5 days ago
Finnair
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$621 Roundtrip, found 5 days ago
$621
Roundtrip
found 5 days ago
Select Finnair flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $621 found 5 days ago
KLM
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$622 Roundtrip, found 5 days ago
$622
Roundtrip
found 5 days ago
Select KLM flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $622 found 5 days ago
Finnair
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$623 Roundtrip, found 5 days ago
$623
Roundtrip
found 5 days ago
Select Finnair flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $623 found 5 days ago
KLM
Wed, Jan 14 - Sat, Jan 17
LHR
London
STL
St. Louis
$649 Roundtrip, found 5 days ago
$649
Roundtrip
found 5 days ago
Select KLM flight, departing Wed, Jan 14 from London to St. Louis, returning Sat, Jan 17, priced at $649 found 5 days ago

Find the cheapest month to fly from London (LHR) to St. Louis (STL)

November is typically the cheapest month to fly

From $703 - $1,585 per traveler.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $699
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $699

Frequently asked questions

How much does a flight from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL) cost?
Snag a cheap one-way flight from $426 or cheap return flight from $613 from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL)?
Planning your trip for January can help you save, as it's the cheapest month for flights between LHR and STL. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll take you from LHR to STL. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from LHR to STL?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL) route, fly before 3 PM. Departures after this hour are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until just before your trip to book your flight from LHR to STL often results in higher prices. While you might find some last-minute offers, they're not always guaranteed. Keep your travel schedule open to boost your chances of snagging a bargain.
Is it cheaper to book a LHR to STL flight and hotel package?
Opting for a LHR to STL flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our impressive range of accommodations and then add flights, activities and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Heathrow Airport (LHR) to Lambert-St. Louis Intl. Airport (STL)?
Typically, it's possible to reschedule or cancel your LHR to STL flight. However, for bookings made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Heathrow
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, KLM, Lufthansa, Scandinavian Airlines, United, Virgin Atlantic
Roundtrip price
$612
Distance
4189 mi

Book with confidence

London to St. Louis Flights

The cheapest times to fly from London to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from London to St. Louis are during the month of January. You can find some of the cheapest flights from London to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from London to St. Louis

Sunday is one of the best days to book for cheap flights from London to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from London to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from London to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $426 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap London to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your London to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

London to St. Louis Flights

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*Available to One Key members.