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

Return flights

08 Oct - 14 Oct	Icelandair
09 Oct - 16 Oct	Icelandair
13 Oct - 20 Oct	Icelandair
06 Oct - 22 Oct	Icelandair
08 Oct - 13 Oct	Icelandair
21 Oct - 29 Oct	Hawaiian Airlines
02 Oct - 30 Oct	Frontier Airlines
11 Oct - 20 Oct	Frontier Airlines
26 Oct - 17 Nov	Alaska Airlines
01 Oct - 25 Oct	Spirit Airlines
06 Oct - 01 Nov	Allegiant Air
08 Oct - 22 Oct	Alaska Airlines
29 Oct - 20 Nov	Hawaiian Airlines
29 Oct - 26 Nov	Hawaiian Airlines
14 Oct - 08 Nov	Air Canada
29 Oct - 05 Nov	Hawaiian Airlines

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 $557

Return flights