£381 Find Cheap Flights from London Heathrow Airport to St. Louis – Compare and Save

For London Heathrow Airport to St. Louis, Saturday is the cheapest day to fly on average and Sunday is the most expensive. Flying from St. Louis back to London Heathrow Airport, the best deals are generally found on Wednesday, with Tuesday being the most expensive.

The cheapest month for flights from London Heathrow Airport to St. Louis is February, where tickets cost £540 (return) on average. On the other hand, the most expensive months are August and July, where the average cost of round-trip tickets is £1,093 and £1,000 respectively.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £729 on average.

To get a below average price on the flight from London Heathrow Airport to St. Louis, you should book around 4 weeks before departure, which saves you about 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

In the past 5 days, the cheapest return tickets from London Heathrow Airport to St. Louis were found on Scandinavian Airlines (£591) and Finnair (£610).

There are 5 airlines that fly direct from London Heathrow Airport to St. Louis. They are: Aer Lingus, American Airlines, British Airways, Finnair and Iberia. The cheapest price of all airlines flying this route was found with British Airways at £524 for a return flight. On average, the best prices for this route can be found at Finnair.

Weekly flights between London and St. Louis historically see delays in approximately 15% of cases, with the average delay over the past year being 110 minutes.

Typically, flights leaving in the early afternoon tend to face fewer delays, whereas flights in the early afternoon have historically encountered delays more often.

Statistically, Friday is the day of the week with the fewest delays on this flight route, while Tuesday has typically experienced more delays than other days.

Based on our data, British Airways have experienced the fewest delays on this route in the past 12 months, with only about 15% of their flights encountering any delays.

Chicago (ORD) is the top choice – 58% of KAYAK users who clicked on one-stop flights from London Heathrow Airport to St. Louis picked an itinerary connecting there.

Flights via Toronto (YYZ) offer the most affordable fares, with an average price of £687 for a return.

Consider flying via Toronto (YYZ) for the shortest journey. The average one-way travel time for flights connecting there is 11h 30m.

If you prefer a quick connection, Chicago (ORD) often has the shortest stopovers from London Heathrow Airport to St. Louis, with an average time of 1h 50m.