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

Return flights

29 Jul - 27 Aug	Lufthansa
27 Jul - 18 Aug	SWISS
17 Jul - 11 Aug	Alaska Airlines
17 Jul - 12 Aug	Alaska Airlines
17 Jul - 13 Aug	Condor
17 Jul - 10 Aug	Alaska Airlines
19 Jul - 15 Aug	Lufthansa
17 Jul - 05 Aug	Alaska Airlines
07 Jul - 25 Jul	SWISS
17 Jul - 08 Aug	Alaska Airlines
18 Jul - 15 Aug	Lufthansa
01 Jul - 06 Jul	Lufthansa
17 Jul - 24 Jul	Finnair
01 Jul - 09 Jul	Icelandair
03 Jul - 19 Jul	WestJet
17 Jul - 31 Jul	Finnair
16 Jul - 31 Jul	Lufthansa
20 Jul - 23 Jul	SWISS

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 655€

Return flights