$404 Cheap Flights from London (YXU) to St. Louis (STL)

View $404 flight on Mon, Dec 15, 2025Opens in a new window

Popular airlines from London, ON (YXU-London Intl.) to St. Louis Lambert Intl. Airport (STL)

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

Prices were available within the past 7 days and start at $404 for one-way flights and $692 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Dec 31 - Sat, Jan 17
YXU
London
STL
St. Louis
$692 Roundtrip, found 6 days ago
$692
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 31 from London to St. Louis, returning Sat, Jan 17, priced at $692 found 6 days ago
United
Sat, Dec 13 - Wed, Dec 31
YXU
London
STL
St. Louis
$701 Roundtrip, found 6 days ago
$701
Roundtrip
found 6 days ago
Select United flight, departing Sat, Dec 13 from London to St. Louis, returning Wed, Dec 31, priced at $701 found 6 days ago
United
Wed, Dec 3 - Tue, Dec 9
YXU
London
STL
St. Louis
$710 Roundtrip, found 6 days ago
$710
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 3 from London to St. Louis, returning Tue, Dec 9, priced at $710 found 6 days ago
United
Sun, Dec 14 - Wed, Dec 31
YXU
London
STL
St. Louis
$720 Roundtrip, found 6 days ago
$720
Roundtrip
found 6 days ago
Select United flight, departing Sun, Dec 14 from London to St. Louis, returning Wed, Dec 31, priced at $720 found 6 days ago
United
Wed, Dec 24 - Tue, Jan 6
YXU
London
STL
St. Louis
$723 Roundtrip, found 6 days ago
$723
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 24 from London to St. Louis, returning Tue, Jan 6, priced at $723 found 6 days ago
United
Wed, Dec 3 - Mon, Dec 8
YXU
London
STL
St. Louis
$729 Roundtrip, found 6 days ago
$729
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 3 from London to St. Louis, returning Mon, Dec 8, priced at $729 found 6 days ago
United
Sat, Dec 6 - Tue, Dec 23
YXU
London
STL
St. Louis
$733 Roundtrip, found 6 days ago
$733
Roundtrip
found 6 days ago
Select United flight, departing Sat, Dec 6 from London to St. Louis, returning Tue, Dec 23, priced at $733 found 6 days ago
Air Canada
Wed, Dec 3 - Wed, Dec 10
YXU
London
STL
St. Louis
$734 Roundtrip, found 6 days ago
$734
Roundtrip
found 6 days ago
Select Air Canada flight, departing Wed, Dec 3 from London to St. Louis, returning Wed, Dec 10, priced at $734 found 6 days ago
United
Wed, Dec 24 - Thu, Jan 8
YXU
London
STL
St. Louis
$742 Roundtrip, found 6 days ago
$742
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 24 from London to St. Louis, returning Thu, Jan 8, priced at $742 found 6 days ago
United
Sun, Dec 7 - Thu, Dec 25
YXU
London
STL
St. Louis
$747 Roundtrip, found 6 days ago
$747
Roundtrip
found 6 days ago
Select United flight, departing Sun, Dec 7 from London to St. Louis, returning Thu, Dec 25, priced at $747 found 6 days ago

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 $813
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $813

Frequently asked questions

How much does a flight from London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $404 or cheap return flight from $692 from London Intl. Airport (YXU) 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 London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from YXU to STL is December, when there's less demand. Off-peak season is generally when you'll find lower airfares between these airports.
What is the cheapest airline that flies from London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest YXU to STL flight.
How many flights per day from London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from YXU to STL?
You'll typically 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 London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL)?
Book a flight from London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures after this time have a 22% higher chance of being canceled, on average.**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 London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from YXU to STL are generally more expensive. For the best prices, start searching for flights well in advance. That being said, if you're flexible with your travel plans, you may find a cheap ticket right before you leave.
Is it cheaper to book a YXU to STL flight and hotel package?
You'll typically save money by booking a YXU to STL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. After choosing your ideal accommodations and flights, consider adding extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from London Intl. Airport (YXU) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your YXU to STL flight within the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

Travel information

Origin airport
London Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, United
Roundtrip price
$692
Distance
564 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 December. 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 $404 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.