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

Return flights

22 Jul - 04 Aug	Lufthansa
06 Jul - 13 Jul	SWISS
29 Jul - 27 Aug	Lufthansa
15 Jul - 29 Jul	Lufthansa
19 Jul - 27 Jul	Lufthansa
07 Jul - 20 Jul	Air Canada
21 Jul - 04 Aug	Scandinavian Airlines
08 Jul - 19 Aug	Lufthansa
22 Jul - 03 Aug	Lufthansa
14 Jul - 27 Jul	SWISS
29 Jul - 03 Aug	Lufthansa
21 Jul - 03 Aug	Lufthansa
27 Jul - 13 Aug	SWISS
05 Jul - 12 Jul	Lufthansa
17 Jul - 20 Jul	Air Canada
01 Jul - 06 Jul	Lufthansa
01 Jul - 07 Jul	Lufthansa
23 Jul - 03 Aug	Lufthansa
05 Jul - 18 Jul	Finnair
15 Jul - 02 Aug	Lufthansa

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

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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Cheapest return flights from Seattle to London in July from $847

Return flights