Cheapest return flights from Seattle to London in April from $615

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

Return flights

15 Apr - 22 Apr Icelandair
05 Apr - 14 Apr Icelandair
23 Apr - 02 May Icelandair
04 Apr - 11 Apr Air Canada
30 Apr - 10 May Icelandair
10 Apr - 21 Apr Icelandair
11 Apr - 16 Apr Icelandair
06 Apr - 07 May Turkish Airlines
10 Apr - 12 Apr Turkish Airlines
09 Apr - 05 May Turkish Airlines

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

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