Cheap flights from London Heathrow Airport to St. Louis from £316
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 Heathrow Airport to St. Louis departing on 8/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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United Airlines flights from London Heathrow Airport to St. Louis
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Iberia flights from London Heathrow Airport to St. Louis
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How to get the cheapest flight ticket from London Heathrow Airport 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 cheapest month to fly to St. Louis?
The month of February is, on average, the cheapest month to fly to St. Louis from London Heathrow Airport, with most prices found around £619. If you’re not able to fly to St. Louis in February, then September is your next best option. Flight prices from London Heathrow Airport to St. Louis during September average around £619.
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 £616. Flights from London Heathrow Airport to St. Louis on a Sunday will generally be more expensive and average around £733. 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 Heathrow Airport 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 £573. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £675.
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 Heathrow Airport when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around £703 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 Heathrow Airport for as low as £617 on momondo.
What is the cheapest airline that flies from London Heathrow to Lambert-St Louis?
WestJet, Aer Lingus, and Finnair are the most popular carriers operating from London Heathrow 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 Heathrow Airport according to our data. Finnair is the first choice among our users, with 78% 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 Heathrow Airport to St. Louis
Cheap London Heathrow Airport to St. Louis (LHR to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to St. Louis
How far is London Heathrow to Lambert-St Louis by plane?
The distance between London Heathrow and Lambert-St Louis is about 4185.8 mi. A reasonable flight in good conditions will take 11h 47m.
When did momondo last update prices for flights from London Heathrow Airport to Lambert-St Louis Airport?
Prices for flights from London Heathrow Airport to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from London Heathrow Airport to Lambert-St Louis Airport?
As of April 2025, there are 7 operators available to choose from for flights from London Heathrow Airport to Lambert-St Louis Airport.
How old do you have to be to fly from London Heathrow Airport 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 Heathrow Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from London Heathrow Airport to St. Louis?
momondo data reveals that the most frequently booked airline on the route from London Heathrow Airport to St. Louis is Finnair, representing 75% of all bookings. The subsequent popular airlines are British Airways at 13%, Iberia at 4%, and Virgin Atlantic at 3%.
Best airlines flying from London Heathrow Airport to St. Louis
Compare and see reviews for airlines that fly from London Heathrow Airport to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £517 | Free Cancellation | Rating 7.6 1,267 reviews | |||
| PriceFrom £613 | Free Cancellation | Rating 7.0 2,659 reviews | |||
| PriceFrom £637 | Free Cancellation | Rating 6.6 6,718 reviews | |||
| PriceFrom £650 | Free Cancellation | Rating 7.4 638 reviews | |||
| PriceFrom £653 | Free Cancellation | Rating 7.4 8,618 reviews | |||
| PriceFrom £692 | Free Cancellation | Rating 6.7 6,964 reviews | |||
| PriceFrom £718 | Free Cancellation | Rating 7.0 9,034 reviews |
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Why should I use momondo to find a flight deal from London to St. Louis?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to St. Louis for you.
Can I find flights from London to St. Louis with flexible booking policies on momondo?
momondo does allow users to show only those flights to St. Louis from London which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from London to St. Louis?
momondo provides multiple filters to help you find the best flight to St. Louis from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to St. Louis from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.