Cheapest return flights from Seattle to London in August from $594

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

Return flights

28 Aug - 11 Sep Scandinavian Airlines
25 Aug - 08 Sep Air Canada
25 Aug - 08 Sep British Airways direct
27 Aug - 04 Sep British Airways direct
05 Aug - 29 Aug British Airways direct
02 Aug - 22 Aug Air Canada
15 Aug - 05 Sep Scandinavian Airlines
10 Aug - 05 Sep Air Canada
02 Aug - 22 Aug British Airways direct
17 Aug - 30 Aug Air Canada
17 Aug - 30 Aug British Airways direct
28 Aug - 11 Sep British Airways direct
10 Aug - 05 Sep Air France direct
15 Aug - 05 Sep Air France direct

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

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