Cheapest return flights from Portland to London in September from $567

AirHint found the following cheapest return flights from Portland (PDX) to London (LHR) in September 2026 (see full year).

Return flights

04 Sep - 19 Sep Icelandair
19 Sep - 30 Sep Icelandair
15 Sep - 22 Sep Air Canada
20 Sep - 30 Sep Delta
15 Sep - 22 Sep Aer Lingus direct
04 Sep - 19 Sep Aer Lingus direct
20 Sep - 30 Sep British Airways direct
19 Sep - 30 Sep British Airways direct

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

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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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