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

Return flights

05 Nov - 18 Nov	Air France
04 Nov - 11 Nov	British Airways	direct
05 Nov - 18 Nov	American Airlines	direct
01 Nov - 22 Nov	Air Canada
14 Nov - 21 Nov	British Airways	direct
26 Nov - 01 Dec	Aer Lingus
19 Nov - 26 Nov	Icelandair
09 Nov - 16 Nov	Icelandair
01 Nov - 22 Nov	British Airways	direct
29 Nov - 06 Dec	British Airways	direct
26 Nov - 01 Dec	Air France	direct
22 Nov - 27 Nov	Icelandair
24 Nov - 01 Dec	Icelandair
19 Nov - 26 Nov	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 $507

Return flights