Cheapest return flights from Seattle to London in May from $516

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

Return flights

04 May - 11 May Icelandair
01 May - 12 May Icelandair
07 May - 30 May Icelandair
14 May - 06 Jun Icelandair
30 May - 09 Jun WestJet
31 May - 20 Jun Aer Lingus
21 May - 13 Jun Icelandair
23 May - 13 Jun WestJet
28 May - 11 Jun Air Canada

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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