Cheapest return flights from Seattle to London in April from 452€

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

Return flights

15 Apr - 30 Apr Icelandair
25 Apr - 09 May Icelandair
23 Apr - 30 Apr Icelandair
23 Apr - 28 Apr Icelandair
07 Apr - 28 Apr Icelandair
08 Apr - 20 Apr Icelandair
07 Apr - 16 Apr Icelandair
06 Apr - 12 Apr Icelandair
05 Apr - 12 Apr Icelandair
29 Apr - 06 May Icelandair
15 Apr - 19 Apr Icelandair
16 Apr - 19 Apr Icelandair
30 Apr - 03 May Turkish Airlines

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

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