Cheapest return flights from Seattle to London in August from $614

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

Return flights

18 Aug - 02 Sep Aer Lingus
16 Aug - 01 Sep Aer Lingus
24 Aug - 01 Sep Aer Lingus
16 Aug - 22 Aug Scandinavian Airlines
09 Aug - 26 Aug Aer Lingus
17 Aug - 25 Aug Aer Lingus
09 Aug - 04 Sep Delta
18 Aug - 29 Aug Scandinavian Airlines
02 Aug - 15 Aug Scandinavian Airlines
03 Aug - 19 Aug British Airways
16 Aug - 26 Aug British Airways
09 Aug - 22 Aug Scandinavian Airlines
15 Aug - 26 Aug Air Canada
08 Aug - 04 Sep Delta
07 Aug - 04 Sep Delta
17 Aug - 25 Aug Alaska Airlines direct
09 Aug - 05 Sep KLM
09 Aug - 06 Sep Air France
10 Aug - 05 Sep KLM
18 Aug - 02 Sep British Airways direct

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

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