Cheapest return flights from Seattle to London in October from $468

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

Return flights

15 Oct - 31 Oct Aer Lingus
01 Oct - 08 Oct Aer Lingus
08 Oct - 14 Oct Aer Lingus
01 Oct - 16 Oct Aer Lingus
14 Oct - 21 Oct British Airways direct
01 Oct - 16 Oct British Airways direct
15 Oct - 22 Oct British Airways direct
01 Oct - 21 Oct American Airlines direct
08 Oct - 14 Oct American Airlines direct
15 Oct - 31 Oct American Airlines direct
17 Oct - 07 Nov Aer Lingus
30 Oct - 06 Nov British Airways direct
24 Oct - 03 Nov Icelandair
17 Oct - 07 Nov British Airways direct
25 Oct - 01 Nov Air France
25 Oct - 01 Nov British Airways direct
24 Oct - 03 Nov Air France direct

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

Skyscanner

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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