Cheapest return flights from Seattle to London in October from 396€

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

Return flights

08 Oct - 21 Oct Aer Lingus
07 Oct - 15 Oct Air Canada
08 Oct - 21 Oct Virgin Atlantic direct
08 Oct - 29 Oct Aer Lingus
08 Oct - 22 Oct Aer Lingus
16 Oct - 27 Oct Icelandair
03 Oct - 11 Oct Icelandair
24 Oct - 03 Nov Icelandair
15 Oct - 22 Oct British Airways direct
21 Oct - 28 Oct British Airways direct
29 Oct - 05 Nov British Airways direct
01 Oct - 15 Oct British Airways direct
24 Oct - 05 Nov Icelandair
10 Oct - 05 Nov Aer Lingus
30 Oct - 13 Nov Delta
10 Oct - 05 Nov British Airways direct
30 Oct - 13 Nov British Airways direct
24 Oct - 05 Nov British Airways direct
23 Oct - 10 Nov Delta
24 Oct - 03 Nov Delta 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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