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

Return flights

18 Apr - 27 Apr	Icelandair
20 Apr - 27 Apr	Icelandair
20 Apr - 30 Apr	Icelandair
07 Apr - 24 Apr	Icelandair
20 Apr - 30 Apr	British Airways	direct
18 Apr - 05 May	Air Canada
07 Apr - 12 Apr	Icelandair
20 Apr - 27 Apr	British Airways	direct
18 Apr - 05 May	British Airways	direct
18 Apr - 27 Apr	British Airways	direct
02 Apr - 07 Apr	Delta
02 Apr - 07 Apr	British Airways	direct
30 Apr - 07 May	Icelandair
25 Apr - 02 May	Icelandair

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

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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Cheapest return flights from Portland to London in April from 456€

Return flights