Cheapest one-way flights from Portland to London in September from $416

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

AirHint found the following cheapest one-way flights from Portland (PDX) to London (LGW) in September 2025 (see full year).

One-Way flights

10 Sep Alaska Airlines
20 Sep Alaska Airlines

Also check the deals for return 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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