$403 Cheap Flights from St. Louis (STL) to London (LHR)

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

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

Prices were available within the past 7 days and start at $403 for one-way flights and $547 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Virgin Atlantic
Delta
British Airways
Virgin Atlantic
United
American Airlines
Air Canada
United
Delta
Air Canada

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

September is typically the cheapest month to fly

From $518 - $1,507 per traveler.

Alternative airports near London

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

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) cost?
Snag a cheap one-way flight from $403 or cheap return flight from $547 from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) 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 Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Planning your trip for March may help you find better deals, as it's the cheapest month for flights between STL and LHR. You'll typically find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from STL to LHR. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to LHR?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary depending on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
Select a flight from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) that leaves before 3 PM to reduce the risk of cancellations. Departures after this hour are on average 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 Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR) last-minute?
Booking your flight from STL to LHR shortly before your getaway is generally more expensive. However, if you're flexible with your itinerary, you could score a cheap last-minute fare.
Is it cheaper to book a STL to LHR flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to LHR flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place will take the hassle out of travel planning. Simply secure your flights and select from our wide range of hotels, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Heathrow Airport (LHR)?
If you reserved your STL to LHR flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you want more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Heathrow
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
$546
Distance
4189 mi

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