Cheapest return flights from Seattle to London in May from 609€

Best time to book flights for Seattle (SEA) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR) in May 2025 (see full year).

Return flights

02 May - 16 May Lufthansa
26 May - 02 Jun Scandinavian Airlines
03 May - 17 May jetBlue
04 May - 18 May Icelandair
01 May - 11 May Lufthansa
15 May - 19 May Icelandair
06 May - 15 May Air Canada
13 May - 20 May Icelandair
09 May - 12 May Icelandair
02 May - 16 May Iberia direct
26 May - 07 Jun Scandinavian Airlines
09 May - 18 May Icelandair
21 May - 12 Jun Icelandair
30 May - 11 Jun Scandinavian Airlines
21 May - 14 Jun Icelandair
30 May - 09 Jun Scandinavian Airlines
11 May - 03 Jun Icelandair
16 May - 06 Jun Aer Lingus
30 May - 22 Jun Scandinavian Airlines
25 May - 07 Jun Icelandair

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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