Cheapest return flights from Seattle to London in August from $854

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

Return flights

09 Aug - 26 Aug Finnair
05 Aug - 12 Aug Air Canada
24 Aug - 01 Sep Icelandair
17 Aug - 25 Aug Air Canada
19 Aug - 25 Aug Air Canada
19 Aug - 26 Aug Air Canada
03 Aug - 19 Aug Condor
26 Aug - 31 Aug Air Canada
21 Aug - 31 Aug Air Canada
15 Aug - 26 Aug Condor
22 Aug - 12 Sep Aer Lingus

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

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