Cheap flights from London to St. Louis from £266
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to St. Louis departing on 21/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customise your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from London to St. Louis
Cheap return flights
Cheap one-way flights
Cheap last-minute flights
Delta flights from London to St. Louis
Our best Delta deals on London to St. Louis flight tickets
Air France flights from London to St. Louis
Our best Air France deals on London to St. Louis flight tickets
See travel insights to St. Louis from
How to get the cheapest flight ticket from London to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between London and St. Louis?
What is the cheapest month to fly to St. Louis?
The month of March is, on average, the cheapest month to fly to St. Louis from London, with most prices found around £553. If you’re not able to fly to St. Louis in March, then January is your next best option. Flight prices from London to St. Louis during January average around £564.
What is the cheapest day to depart on your flight to St. Louis?
Our data shows that Wednesday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £604. Flights from London to St. Louis on a Sunday will generally be more expensive and average around £719. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to St. Louis?
Our data shows that the cheapest London to St. Louis flights are usually those with departure times in the evening. Our users have found flights to St. Louis in the evening for as low as £563. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £662.
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from London when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around £697 when searching 4 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London for as low as £618 on momondo.
What is the cheapest airline that flies from London to Lambert-St Louis?
WestJet, Aer Lingus, and British Airways are the most popular carriers operating from London to Lambert-St Louis
Which airlines fly to St. Louis?
Finnair, British Airways and Iberia are the top three most popular airlines that fly to St. Louis from London according to our data. Finnair is the first choice among our users, with 75% of people opting to fly with this airline when travelling to St. Louis. Keep in mind that there are 7 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
When to book flights from London to St. Louis
Cheap London to St. Louis (LON to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London to St. Louis
How far is London to Lambert-St Louis by plane?
The distance between London and Lambert-St Louis is about 4197.7 mi. Flights usually cover this in 11h 53m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London to Lambert-St Louis Airport?
Prices for flights from London to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from London to Lambert-St Louis Airport?
As of May 2025, there are 7 operators available to choose from for flights from London to Lambert-St Louis Airport.
How old do you have to be to fly from London to Lambert-St Louis Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from London to St. Louis?
momondo data reveals that the most frequently booked airline on the route from London to St. Louis is Finnair, representing 68% of all bookings. The subsequent popular airlines are British Airways at 16%, Iberia at 5%, and Virgin Atlantic at 4%.
Best airlines flying from London to St. Louis
Compare and see reviews for airlines that fly from London to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £509 | Free Cancellation | Rating 7.6 1,275 reviews | |||
| PriceFrom £603 | Free Cancellation | Rating 7.0 2,701 reviews | |||
| PriceFrom £631 | Free Cancellation | Rating 6.6 6,842 reviews | |||
| PriceFrom £638 | Free Cancellation | Rating 7.4 643 reviews | |||
| PriceFrom £641 | Free Cancellation | Rating 7.4 8,696 reviews | |||
| PriceFrom £679 | Free Cancellation | Rating 6.7 7,045 reviews | |||
| PriceFrom £705 | Free Cancellation | Rating 7.0 9,252 reviews |
Travelling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from London to St. Louis?
Finding the right flight to St. Louis from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.
Can I find flights from London to St. Louis with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for London to St. Louis flights to just show those with flexible booking policies.
How can momondo help me find flights from London to St. Louis?
Once you have performed a search for London to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?
If you are not ready to book a flight from London to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.