£330 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 Friday, with Tuesday being the most expensive.

The cheapest month for flights from London Heathrow Airport to St. Louis is February, where tickets cost £533 (return) on average. On the other hand, the most expensive months are August and December, where the average cost of round-trip tickets is £1,079 and £975 respectively.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 2 stops stopover the cheapest option at £762 on average.

To get a below average price on the flight from London Heathrow Airport to St. Louis, you should book around 3 weeks before departure, which saves you about 42% 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 Air Canada (£632) and United Airlines (£635).

There are 6 airlines that fly direct from London Heathrow Airport to St. Louis. They are: Aer Lingus, American Airlines, British Airways, Finnair, Iberia and United Airlines. The cheapest price of all airlines flying this route was found with Aer Lingus at £392 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 17% of cases, with the average delay over the past year being 112 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 Sunday 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 17% of their flights encountering any delays.

Chicago (ORD) is the top choice – 46% of KAYAK users who clicked on one-stop flights from London Heathrow Airport to St. Louis picked an itinerary connecting there.

Flights via Lisbon (LIS) offer the most affordable fares, with an average price of £588 for a return.

Consider flying via Chicago (ORD) for the shortest journey. The average one-way travel time for flights connecting there is 12h 23m.

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 40m.