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Cheap Flights from St Louis to London Heathrow

Compare St Louis to London Heathrow flight deals

Find the cheapest month or even day of the year to fly to London Heathrow

Book the best London Heathrow fare with no extra fees

Flight deals from St Louis to London Heathrow

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to London Heathrow Airport? If you want to travel next month, return fares start from R 14,010. Find the lowest prices on one-way and return tickets right here.
London.R 5,314 per passenger.Departing Tue, 21 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 21 Jul, arriving in London Heathrow.Price includes taxes and charges.From R 5,314, select.
London.R 5,315 per passenger.Departing Mon, 7 Sep.One-way flight with Air France.Outbound indirect flight with Air France, departs from St Louis on Mon, 7 Sep, arriving in London Heathrow.Price includes taxes and charges.From R 5,315, select.
London.R 5,316 per passenger.Departing Wed, 14 Oct.One-way flight with British Airways.Outbound direct flight with British Airways departs from St Louis on Wed, 14 Oct, arriving in London Heathrow.Price includes taxes and charges.From R 5,316, select.
London.R 5,322 per passenger.Departing Wed, 9 Sep.One-way flight with British Airways.Outbound direct flight with British Airways departs from St Louis on Wed, 9 Sep, arriving in London Heathrow.Price includes taxes and charges.From R 5,322, select.
London.R 5,331 per passenger.Departing Wed, 5 May.One-way flight with British Airways.Outbound direct flight with British Airways departs from St Louis on Wed, 5 May, arriving in London Heathrow.Price includes taxes and charges.From R 5,331, select.
London.R 5,372 per passenger.Departing Wed, 28 Apr.One-way flight with British Airways.Outbound direct flight with British Airways departs from St Louis on Wed, 28 Apr, arriving in London Heathrow.Price includes taxes and charges.From R 5,372, select.
London.R 5,378 per passenger.Departing Tue, 16 Mar.One-way flight with Air France.Outbound indirect flight with Air France, departs from St Louis on Tue, 16 Mar, arriving in London Heathrow.Price includes taxes and charges.From R 5,378, select.
London.R 5,378 per passenger.Departing Tue, 17 Nov.One-way flight with Air France.Outbound indirect flight with Air France, departs from St Louis on Tue, 17 Nov, arriving in London Heathrow.Price includes taxes and charges.From R 5,378, select.
London.R 5,405 per passenger.Departing Wed, 10 Feb.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed, 10 Feb, arriving in London Heathrow.Price includes taxes and charges.From R 5,405, select.
London.R 5,450 per passenger.Departing Mon, 7 Dec.One-way flight with Air France.Outbound indirect flight with Air France, departs from St Louis on Mon, 7 Dec, arriving in London Heathrow.Price includes taxes and charges.From R 5,450, select.
London.R 5,610 per passenger.Departing Tue, 4 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 4 Aug, arriving in London Heathrow.Price includes taxes and charges.From R 5,610, select.
London.R 6,223 per passenger.Departing Fri, 1 Jan.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Fri, 1 Jan, arriving in London Heathrow.Price includes taxes and charges.From R 6,223, select.
London.R 8,730 per passenger.Departing Sat, 27 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 27 Jun, arriving in London Heathrow.Price includes taxes and charges.From R 8,730, select.
London.R 12,197 per passenger.Departing Sun, 30 Aug.One-way flight with American Airlines.Outbound direct flight with American Airlines departs from St Louis on Sun, 30 Aug, arriving in London Heathrow.Price includes taxes and charges.From R 12,197, select.
London.R 12,197 per passenger.Departing Tue, 7 Jul.One-way flight with British Airways.Outbound direct flight with British Airways departs from St Louis on Tue, 7 Jul, arriving in London Heathrow.Price includes taxes and charges.From R 12,197, select.
London.R 13,189 per passenger.Departing Tue, 30 Jun.One-way flight with Iberia.Outbound direct flight with Iberia departs from St Louis on Tue, 30 Jun, arriving in London Heathrow.Price includes taxes and charges.From R 13,189, select.

Find the cheapest month to fly from St Louis to London Heathrow

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to London Heathrow flights are currently cheapest in July.
Jun
from R 8,730
Jul
from R 5,314
Aug
from R 5,610
Sep
from R 5,315
Oct
from R 5,316
Nov
from R 5,378
Dec
from R 5,450
Jan
from R 6,223
Feb
from R 5,405
Mar
from R 5,378
Apr
from R 5,372
May
from R 5,331

Direct flights from St Louis to London Heathrow

St Louis to London Heathrow: Alternative routes

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

London City

12km from central London
Closest
from R 5,657
Search flights

London Heathrow

23km from central London
from R 5,314
Search flights

London Gatwick

40km from central London
Cheapest
from R 4,461
Search flights

London Luton

45km from central London
from R 5,668
Search flights

London Stansted

49km from central London
from R 5,668
Search flights

London Southend

57km from central London
from R 6,733
Search flights

St Louis to London: Flight information

The things to know before you go.
Cheapest flight foundR 5,314
Cheapest month to flyJuly
Average flight time8 hrs
Most popular airlineAer Lingus
Average flights per week18

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

The best price we found for a return flight from St Louis to London Heathrow is R 12,182. 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.
8 hours is the average flight time from St Louis to London Heathrow.
Aer Lingus, American Airlines and Finnair fly direct from St Louis to London Heathrow.
As of June 2026, there are 18 flights per week flying from St Louis to London Heathrow.
The cheapest month to fly from St Louis to London Heathrow is usually November.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to London Heathrow Airport on Monday, 9 November 2026.
Yes – the average flight time is 8 hours.
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 London Heathrow 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 London is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Air Canada and Finnair offer the cheapest flight tickets to London Heathrow.

Travelling from Lambert-St. Louis International Airport (STL) to London Heathrow Airport (LHR): what you need to know

  • The timezone in London is UTC+0, which is five hours ahead of St Louis.

  • Give yourself plenty of time to make your STL to LHR flight. As a general rule, turn up two hours before international departures and an hour ahead for domestic flights.

  • During popular months such as July, you'll want to get to the airport well in advance. Plan to arrive two hours before a domestic departure and four hours ahead for international flights whenever you're flying during peak periods in general.

  • If you'd like to include a stop along the way, just uncheck 'Direct flights only' when searching for your ticket from Lambert-St. Louis International Airport to London Heathrow Airport. Here are the most popular stopovers between STL and LHR:

    • O'Hare International Airport

    • Detroit Metropolitan Wayne County Airport

    • Logan International Airport

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

  • The lowest price we've found for a one-way Lambert-St. Louis International Airport to London Heathrow Airport flight is R 5,314. A return fare right now is R 12,182. Depending on the availability and when you book, these fares may change.

  • It's usually best to book as early as possible if you want to find cheap tickets from STL to LHR. That's because airlines change prices based on demand, which tends to rise closer to the date of departure.

  • The 'Whole month' search tool shows you the cheapest flights from Lambert-St. Louis International Airport to London Heathrow Airport throughout the month. It's a great way to snap up a bargain if your travel dates aren't set in stone.

  • You don't need to check every day to see if fares have dropped when you set up a Price Alert. We'll notify you the moment there's a new deal on cheap flights from STL to LHR.

  • Choose your preferred departure and arrival times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to find the best deals on flights from Lambert-St. Louis International Airport to London Heathrow Airport.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at London Heathrow Airport (LHR)

Getting from London Heathrow Airport (LHR) to central London

  • London Heathrow Airport to central London has a drive time of around 55 minutes. It's approximately 31 kilometres away.

  • Travelling to the centre on public transport will take you around 1 hour.

When to fly to London Heathrow Airport (LHR)

  • July is the busiest month for flights from Lambert-St. Louis International Airport to London Heathrow Airport. To escape the crowds, head to London in February.

  • The warmest month in London is July, with temperatures ranging between 11ºC (52ºF) and 26ºC (79ºF). Book your flights from Lambert-St. Louis International Airport to London Heathrow Airport in this month if you like this kind of weather.

  • January has average temperatures of between 0ºC (32ºF) and 9ºC (48ºF). Search for cheap tickets from STL to LHR around that time if you want to travel when it's cooler.

Explore more of United Kingdom

  • You've done London, now it's time to explore more of United Kingdom. Journey about 161 kilometres north-west to Birmingham to check off its leading attractions. From Cadbury World to The Library of Birmingham and National Sea Life Centre, there's plenty to keep you on the go.

  • Around 177 kilometres west of London, Bristol is another favourite stop in United Kingdom. Get a taste of what this destination has to offer at Clifton Suspension Bridge, Cabot Tower and Brandon Hill Nature Park.

Plan the rest of your trip from St Louis to London

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