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

One-Way flights

12 Nov	WestJet
11 Nov	Air Canada
15 Nov	WestJet
10 Nov	WestJet
19 Nov	Air Canada
11 Nov	British Airways	direct
10 Nov	Air France	direct
12 Nov	Air France	direct
19 Nov	Delta	direct
15 Nov	Air France	direct

Also check the deals for return 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 one-way flights from Seattle to London in November from 253€

One-Way flights