Cheapest return flights from Seattle to London in August from 518€

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

Return flights

09 Aug - 26 Aug Air Canada
09 Aug - 20 Aug Air Canada
03 Aug - 04 Sep Finnair
19 Aug - 16 Sep Air Canada
19 Aug - 26 Aug Aer Lingus
03 Aug - 02 Sep United
09 Aug - 30 Aug Air Canada
03 Aug - 02 Sep British Airways direct
03 Aug - 04 Sep British Airways direct
01 Aug - 01 Sep Lufthansa
09 Aug - 26 Aug Alaska Airlines direct
19 Aug - 16 Sep British Airways direct
06 Aug - 23 Aug Aer Lingus
07 Aug - 14 Aug Finnair
01 Aug - 01 Sep Finnair direct
08 Aug - 05 Sep Air Canada
19 Aug - 26 Aug Air France direct
06 Aug - 23 Aug British Airways direct
07 Aug - 14 Aug Air France direct
08 Aug - 05 Sep Finnair direct

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

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