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

Return flights

22 Oct - 31 Oct	Icelandair
20 Oct - 29 Oct	Icelandair
22 Oct - 29 Oct	Icelandair
27 Oct - 10 Nov	Icelandair
16 Oct - 31 Oct	Icelandair
02 Oct - 15 Oct	Icelandair
06 Oct - 14 Oct	Icelandair
24 Oct - 31 Oct	Icelandair
09 Oct - 21 Nov	Icelandair
08 Oct - 15 Oct	Icelandair
09 Oct - 01 Nov	Icelandair
05 Oct - 21 Oct	Lufthansa
12 Oct - 21 Oct	Air Canada
10 Oct - 21 Nov	British Airways	direct
09 Oct - 21 Nov	British Airways	direct
26 Oct - 10 Nov	British Airways	direct
27 Oct - 10 Nov	Finnair	direct
27 Oct - 03 Nov	British Airways	direct
30 Oct - 06 Nov	United
24 Oct - 08 Nov	Air Canada

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 417€

Return flights