AirHint found the following cheapest return flights from Portland (PDX) to London (LGW) in October 2025 (see full year).

Return flights

15 Oct - 22 Oct	Icelandair
16 Oct - 23 Oct	Icelandair
14 Oct - 21 Oct	Lufthansa
06 Oct - 13 Oct	Icelandair
23 Oct - 27 Oct	Icelandair
08 Oct - 15 Oct	Icelandair
29 Oct - 05 Nov	Hawaiian Airlines
17 Oct - 24 Oct	Alaska Airlines
05 Oct - 13 Oct	Air Canada
07 Oct - 17 Oct	Icelandair

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

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 Portland to London in October from $478

Return flights