Cheapest return flights from Portland to London in September from $620

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

Return flights

07 Sep - 22 Sep Air Canada
21 Sep - 29 Sep Lufthansa
15 Sep - 14 Oct Air Canada
15 Sep - 14 Oct American Airlines direct
08 Sep - 26 Sep Air Canada
07 Sep - 26 Sep Air Canada
07 Sep - 22 Sep British Airways direct
08 Sep - 26 Sep British Airways direct
07 Sep - 26 Sep Iberia 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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