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

Return flights

16 Apr - 21 Apr	Icelandair
16 Apr - 29 Apr	Icelandair
21 Apr - 28 Apr	Icelandair
16 Apr - 01 May	Icelandair
15 Apr - 29 Apr	Delta
22 Apr - 29 Apr	Delta
15 Apr - 28 Apr	Virgin Atlantic
08 Apr - 15 Apr	Delta
15 Apr - 30 Apr	Delta
21 Apr - 30 Apr	Delta
07 Apr - 16 Apr	Delta
15 Apr - 01 May	Delta
17 Apr - 01 May	Delta
27 Apr - 04 May	Icelandair
30 Apr - 07 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 465€

Return flights