Cheapest return flights from Seattle to London in August from 666€

Best time to book flights for Seattle (SEA) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR) in August 2025 (see full year).

Return flights

20 Aug - 03 Sep Iberia direct
29 Aug - 07 Sep Scandinavian Airlines
27 Aug - 14 Sep Delta
01 Aug - 31 Aug Scandinavian Airlines
12 Aug - 12 Sep Aer Lingus
12 Aug - 12 Sep Delta direct
11 Aug - 19 Aug Scandinavian Airlines
10 Aug - 20 Aug Scandinavian Airlines
24 Aug - 30 Aug Icelandair
10 Aug - 20 Aug Air France direct
11 Aug - 19 Aug Air France direct
01 Aug - 31 Aug Air France direct
31 Aug - 07 Sep United
28 Aug - 22 Sep Icelandair
30 Aug - 13 Sep United
14 Aug - 20 Aug Aer Lingus
30 Aug - 13 Sep Iberia direct
28 Aug - 22 Sep Air France direct
14 Aug - 20 Aug KLM direct
05 Aug - 12 Aug United

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

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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