Cheapest return flights from Seattle to London in May from $558

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

Return flights

06 May - 19 May Icelandair
04 May - 19 May Icelandair
03 May - 19 May Icelandair
03 May - 20 May Icelandair
03 May - 10 May Icelandair
05 May - 15 May Icelandair
04 May - 21 May Icelandair
13 May - 19 May Icelandair
06 May - 13 May Icelandair
03 May - 18 May Icelandair
26 May - 09 Jun Scandinavian Airlines
16 May - 02 Jun Icelandair
19 May - 02 Jun Icelandair
14 May - 04 Jun Icelandair
18 May - 01 Jun Icelandair
30 May - 09 Jun Scandinavian Airlines
19 May - 02 Jun Air France direct
27 May - 03 Jun Icelandair
29 May - 26 Jun Scandinavian Airlines
16 May - 02 Jun Air France direct

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

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