Cheapest return flights from Seattle to London in August from $532

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 - 01 Sep Icelandair
18 Aug - 29 Aug Icelandair
20 Aug - 26 Aug Icelandair
21 Aug - 01 Sep Icelandair
11 Aug - 18 Aug Icelandair
18 Aug - 07 Sep Icelandair
20 Aug - 03 Sep Icelandair
20 Aug - 10 Sep Icelandair
03 Aug - 21 Aug Icelandair
02 Aug - 20 Aug Icelandair
10 Aug - 20 Aug Icelandair
07 Aug - 19 Aug Icelandair
18 Aug - 27 Aug Icelandair
23 Aug - 27 Aug Icelandair
14 Aug - 21 Aug Icelandair
07 Aug - 03 Sep Icelandair
30 Aug - 05 Sep Icelandair
15 Aug - 10 Sep Icelandair
20 Aug - 03 Sep Air France direct
20 Aug - 10 Sep Air France direct

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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