Cheapest return flights from St. Louis to London in May from $806

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

Return flights

06 May - 12 May Air Canada
06 May - 13 May Aer Lingus
05 May - 12 May Aer Lingus
04 May - 10 May Southern Airways Express
01 May - 08 May Aer Lingus
20 May - 03 Jun Frontier Airlines
26 May - 09 Jun Frontier Airlines
31 May - 14 Jun Frontier Airlines
05 May - 10 May Air Canada
27 May - 02 Jun Air Canada
01 May - 06 May WestJet
20 May - 02 Jun WestJet
03 May - 10 May Aer Lingus
28 May - 03 Jun Air Canada
19 May - 29 May Aer Lingus
21 May - 31 May Alaska Airlines

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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