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

Return flights

05 Nov - 12 Nov	Icelandair
15 Nov - 22 Nov	Icelandair
25 Nov - 02 Dec	Icelandair
30 Nov - 07 Dec	Icelandair
11 Nov - 18 Nov	Icelandair
10 Nov - 17 Nov	Icelandair
10 Nov - 21 Nov	Icelandair
05 Nov - 12 Nov	British Airways	direct
20 Nov - 27 Nov	Icelandair
11 Nov - 18 Nov	British Airways	direct
10 Nov - 21 Nov	British Airways	direct
19 Nov - 02 Dec	Delta
25 Nov - 02 Dec	British Airways	direct
10 Nov - 17 Nov	Virgin Atlantic	direct
30 Nov - 07 Dec	British Airways	direct

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

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 November from 441€

Return flights