Cheapest return flights from St. Louis to London in May from $817

AirHint found the following cheapest return flights from St. Louis (STL) to London (STN) in May 2026 (see full year).

Return flights

10 May - 22 May Frontier Airlines
12 May - 19 May Air Canada
01 May - 07 May Aer Lingus
03 May - 10 May Frontier Airlines
20 May - 03 Jun Air Canada
01 May - 06 May Lufthansa
31 May - 06 Jun Air Canada
24 May - 04 Jun Air Canada
31 May - 05 Jun Air Canada
21 May - 02 Jun Frontier Airlines
22 May - 02 Jun Frontier Airlines
27 May - 04 Jun Air Canada
20 May - 27 May WestJet
20 May - 02 Jun Air Canada
20 May - 26 May Air Canada
01 May - 08 May Lufthansa
21 May - 26 May WestJet
27 May - 31 May Air Canada

Also check the deals for one-way flights from St. Louis to London in May.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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