Cheapest return flights from Seattle to London in May from $508

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

Return flights

01 May - 08 May Icelandair
05 May - 12 May Icelandair
13 May - 19 May Air Canada
01 May - 10 May Air Canada
05 May - 20 May Icelandair
06 May - 12 May Icelandair
11 May - 21 May Icelandair
06 May - 10 May Icelandair
08 May - 15 May Icelandair
21 May - 26 May Aer Lingus
30 May - 06 Jun Icelandair
22 May - 04 Jun Turkish Airlines

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

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