Cheapest return flights from Seattle to London in May from $637

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

Return flights

17 May - 24 May Icelandair
13 May - 21 May Icelandair
04 May - 01 Jun Icelandair
13 May - 30 May Aer Lingus
01 May - 28 May Turkish Airlines
01 May - 12 May Turkish Airlines
27 May - 24 Jun Icelandair
04 May - 18 May Aer Lingus
29 May - 26 Jun Lufthansa

Also check the deals for one-way flights from Seattle 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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