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

Return flights

26 Nov - 05 Dec	Lufthansa
19 Nov - 26 Nov	Aer Lingus
26 Nov - 03 Dec	Aer Lingus
11 Nov - 02 Dec	Air Canada
04 Nov - 12 Nov	Lufthansa
03 Nov - 18 Nov	Air Canada
03 Nov - 17 Nov	Icelandair
05 Nov - 12 Nov	Lufthansa
10 Nov - 20 Nov	Air France
10 Nov - 18 Nov	Air France
04 Nov - 18 Nov	Air France
26 Nov - 02 Dec	Lufthansa
05 Nov - 12 Nov	British Airways	direct
10 Nov - 20 Nov	British Airways	direct
29 Nov - 12 Dec	Delta
26 Nov - 08 Dec	Lufthansa
26 Nov - 26 Dec	Aer Lingus
11 Nov - 02 Dec	Virgin Atlantic	direct
12 Nov - 06 Dec	Air France
17 Nov - 13 Dec	Lufthansa

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 395€

Return flights