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

Return flights

16 Nov - 26 Nov	Aer Lingus
17 Nov - 26 Nov	Icelandair
10 Nov - 17 Nov	Icelandair
11 Nov - 18 Nov	Icelandair
30 Nov - 09 Dec	Icelandair
19 Nov - 26 Nov	Aer Lingus
14 Nov - 17 Nov	Icelandair
14 Nov - 16 Nov	Icelandair
12 Nov - 16 Nov	Aer Lingus
13 Nov - 17 Nov	Hawaiian Airlines
13 Nov - 16 Nov	Icelandair
24 Nov - 07 Dec	WestJet

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 436€

Return flights