Cheapest return flights from Seattle to London in April from $513

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

Return flights

21 Apr - 30 Apr Icelandair
10 Apr - 29 Apr Icelandair
01 Apr - 08 Apr Icelandair
02 Apr - 25 Apr Icelandair
01 Apr - 25 Apr Icelandair
01 Apr - 11 Apr Icelandair
15 Apr - 09 May Icelandair
11 Apr - 02 May Icelandair
10 Apr - 21 Apr Icelandair
15 Apr - 22 Apr Icelandair
25 Apr - 02 May Icelandair
30 Apr - 23 May Icelandair
30 Apr - 07 May Icelandair
03 Apr - 12 Apr Icelandair
01 Apr - 08 Apr Virgin Atlantic direct
15 Apr - 09 May Air France direct
30 Apr - 07 May British Airways direct
11 Apr - 02 May Air France direct
25 Apr - 02 May British Airways direct
30 Apr - 23 May Air France direct

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

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