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

Return flights

02 May - 09 May	Icelandair
18 May - 01 Jun	Icelandair
01 May - 12 May	Finnair
12 May - 28 May	Delta
10 May - 01 Jun	Virgin Atlantic
01 May - 04 May	Finnair
01 May - 09 May	Finnair
09 May - 24 May	Air Canada
18 May - 26 May	British Airways	direct
20 May - 12 Jun	British Airways	direct
18 May - 01 Jun	British Airways	direct
10 May - 01 Jun	British Airways	direct
15 May - 03 Jun	Air Canada
22 May - 29 May	Icelandair
27 May - 03 Jun	Icelandair
07 May - 14 May	Icelandair
12 May - 19 May	Icelandair

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

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 May from 498€

Return flights