Cheap flights from London to St Louis

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Flight deals from London to St Louis

Looking for a cheap last-minute deal or the best return flight from London to St Louis Airport? If you want to travel next month, return fares start from $1,146. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from London to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London to St Louis flights are currently cheapest in June.

Direct flights from London to St Louis

London to St Louis: Alternative routes

Compare routes from London to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

London to St Louis: Flight information

The things to know before you go.
Cheapest flight found$606
Cheapest month to flyJune
Average flight time9 hrs, 5 mins
Most popular airlineAer Lingus
Average flights per week19

Finding cheap flights from London to St Louis: Frequently asked questions

The best price we found for a return flight from London to St Louis is $874. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
9 hours and 5 minutes is the average flight time from London to St Louis.
Aer Lingus, American Airlines and Finnair fly direct from London to St Louis.
As of June 2026, there are 19 flights per week flying from London to St Louis.
The cheapest month to fly from London to St Louis is usually September.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from London to St Louis Airport on Wednesday, 2 September 2026.
Yes – the average flight time is 9 hours and 5 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Flying from London to St Louis Lambert International Airport (STL): What you need to know

  • London's main base, London Heathrow Airport (LHR), is where new adventures begin. Explore the departure options from here when searching for a flight from London to St Louis Lambert International Airport (STL).

  • The average length of a direct London to St Louis Lambert International Airport flight is 9 hours 5 minutes.

  • St Louis Lambert International Airport is located in St Louis. The city operates on the UTC-6 timezone and is six hours behind London.

  • Pick from 2 direct services each week between London Heathrow Airport (LHR) and St Louis Lambert International Airport (STL). This is the most popular route when departing from London.

  • To ensure you get on your flight from London to STL, leave plenty of time to navigate the airport and find your gate. Arriving two hours before international departures and one hour before domestic flights is the general travel rule.

  • Travelling during a popular month such as July? School holidays and other popular seasons can lead to longer queues at check-in and security. Be extra cautious and arrive up to four hours ahead of international flights and two hours before a domestic departure.

Airports in London

London Heathrow Airport (LHR)

  • Take the express route from London Heathrow Airport (LHR). Nonstop flights from London to St Louis Lambert International Airport (STL) operate from here.

  • When leaving from LHR, you can take a direct flight from London to St Louis Lambert International Airport with British Airways.

  • The majority of passengers choose to fly with British Airways from LHR to STL.

  • Stopovers are the ideal opportunity to take a break from travelling and possibly even explore another city. When searching for cheap flights from London to STL leaving from London Heathrow Airport (LHR), uncheck the 'Direct flights only' box to get ideas for where to visit along the way. Top options include:

    • Chicago O'Hare International Airport (ORD)

    • Detroit Metropolitan Wayne County Airport (DTW)

    • Montreal-Trudeau International Airport (YUL)

  • LHR is around 24 kilometres from central London. If you're driving, ride-sharing or catching a taxi from the centre, it'll take 45 minutes or so to get there, depending on traffic conditions. If you're planning to take public transport, expect the journey time to be around 25 minutes.

  • Want a hassle-free start to your holiday? Stay near London Heathrow Airport. Whether you have an early flight from London to St Louis Lambert International Airport or just don't want to be rushed, these hotels are just the thing:

  • Of the departures from London Heathrow Airport, 78% arrive as scheduled at their destination.

London Gatwick Airport (LGW)

  • Break up your flight from London to St Louis Lambert International Airport with a stop so you can recharge or cross a new place off your list. Some great stopovers between London Gatwick Airport and STL are:

    • Toronto Pearson International Airport (YYZ)

    • Orlando International Airport (MCO)

    • Cancun International Airport (CUN)

  • You can arrive at LGW from the centre of London in about 1 hour 5 minutes by car (depending on traffic conditions). The ride on public transport will take roughly 1 hour 20 minutes to travel the 48 kilometres or so.

  • Want to treat yourself to an extra night away before boarding your London to STL flight? Check in to a hotel near London Gatwick Airport before your holiday officially begins. Here's where you can stay:

  • Flights from London Gatwick Airport are known for their punctuality, with 82% of them touching down as planned.

London Stansted Airport (STN)

  • The journey to STN from central London is around 45 minutes by public transport. If you're going by car, it'll take you roughly 1 hour 5 minutes to cover the 56 kilometres or so.

  • Make catching an early London to St Louis Lambert International Airport flight the easiest part of your journey. Stay at one of these hotels near London Stansted Airport and get to your departure gate with plenty of time to spare:

  • STN has an on-time performance rate of 80%. This means most of its flights arrive at their destination on schedule and your travel plans stay on track.

About St Louis Lambert International Airport (STL)

Getting from St Louis Lambert International Airport (STL) to central St Louis

  • Central St Louis is around 24 kilometres from St Louis Lambert International Airport and takes about 25 minutes to reach by car. See what your options are for making the trip into the city, whether that's with a car hire, taxi or ride-share.

  • It takes around 30 minutes if you're travelling by public transport.

How to find the cheapest flights from London to St Louis Lambert International Airport (STL)

  • Currently, $606 is the lowest price we've found for a one-way ticket from London to St Louis Lambert International Airport. The cheapest price for a return flight is $874. Remember fares can change due to demand at the time of booking.

  • To pick up cheap flights from London to STL, book in advance. Airlines generally offer their most competitively priced fares when tickets are first released.

  • Affordable London to St Louis Lambert International Airport tickets are easier to find when you have flexibility in your schedule. Use the 'Whole month' search function to compare fares across the month and then pick the cheapest day.

  • You don't need to search every day to find out if fares have dropped when you create a Price Alert. We'll let you know as soon as a lower fare pops up on plane tickets from London to STL.

  • Lock in a cheap flight from London to St Louis Lambert International Airport by using filters. Choose your ideal duration, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

The best time to fly from London to St Louis Lambert International Airport (STL)

  • Picture the kind of break you want when deciding the best time to fly. December is the quietest month to visit St Louis. July is when most people book flights from London to St Louis Lambert International Airport (STL), which may be perfect if you enjoy travelling when it's busier.

  • When booking your London to STL plane ticket, consider the weather you're most comfortable in. July is the warmest month in St Louis, with temperatures ranging from 17ºC (63ºF) to 33ºC (91ºF).

  • January has temperatures of between -7ºC (19ºF) and 8ºC (46ºF). Search for cheap tickets from London to St Louis Lambert International Airport around that time if you'd rather travel in cooler conditions.

More about St Louis

Explore more of the United States

  • You've done St Louis, now it's time to discover other parts of the United States. Travel about 257 kilometres east to Evansville to check off its must-visit sights. From Mesker Park Zoo to Riverfront Park and Evansville Museum of Arts, History & Science, you've got a jam-packed schedule ahead.

  • If you're interested in discovering another side of the United States, consider Columbia, roughly 177 kilometres west of St Louis. Museum of Art and Archaeology, Mizzou Botanic Garden and Francis Quadrangle are key reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.