Cheapest return flights from Portland to London in September from 649€

Best time to book flights for Portland (PDX) to London (LHR) flights at AirHint

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

Return flights

30 Sep - 14 Oct Air Canada
30 Sep - 14 Oct Iberia direct
30 Sep - 07 Oct United
10 Sep - 17 Sep Air Canada
10 Sep - 17 Sep Finnair direct
20 Sep - 27 Sep Icelandair
18 Sep - 28 Sep Delta
06 Sep - 13 Sep Icelandair
06 Sep - 13 Sep Iberia direct
18 Sep - 28 Sep British Airways direct
05 Sep - 20 Sep Delta

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

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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