Cheapest return flights from St. Louis to London in May from 769€

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

Return flights

03 May - 10 May Frontier Airlines
16 May - 30 May Frontier Airlines
16 May - 31 May Frontier Airlines
17 May - 31 May Frontier Airlines
15 May - 22 May Air Canada
14 May - 21 May Air Canada
01 May - 08 May Aer Lingus
17 May - 24 May Air Canada
17 May - 01 Jun Frontier Airlines
18 May - 25 May Air Canada
03 May - 15 May Aer Lingus

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

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