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

Return flights

20 Jul - 05 Aug	Air France	direct
21 Jul - 15 Aug	Air France	direct
10 Jul - 01 Aug	Air France	direct
11 Jul - 01 Aug	Air France	direct
03 Jul - 17 Jul	Delta
06 Jul - 10 Jul	Icelandair
03 Jul - 17 Jul	British Airways	direct
06 Jul - 10 Jul	British Airways	direct

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 679€

Return flights