Cheapest return flights from Seattle to London in May from 444€

AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR) in May 2026 (see full year).

Return flights

08 May - 16 May Icelandair
07 May - 14 May Icelandair
02 May - 09 May Icelandair
22 May - 13 Jun Scandinavian Airlines
07 May - 14 May British Airways direct
06 May - 30 May Finnair
13 May - 06 Jun Finnair
02 May - 09 May British Airways direct
23 May - 30 May Scandinavian Airlines
23 May - 06 Jun Scandinavian Airlines
01 May - 31 May Air Canada
31 May - 20 Jun Scandinavian Airlines
24 May - 13 Jun Aer Lingus
25 May - 08 Jun Aer Lingus
13 May - 06 Jun British Airways direct
06 May - 30 May British Airways direct
27 May - 03 Jun Icelandair
15 May - 06 Jun Finnair
14 May - 06 Jun Air Canada
17 May - 24 May Icelandair

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

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