Cheapest one-way flights from Portland to London in September from $360

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

One-Way flights

18 Sep jetBlue
25 Sep Sun Country 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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