Cheapest return flights from Portland to London in May from $684

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

AirHint found the following cheapest return flights from Portland (PDX) to London (LHR) in May 2025 (see full year).

Return flights

12 May - 05 Jun Icelandair
14 May - 21 May Icelandair
30 May - 04 Jun Icelandair
25 May - 09 Jun Icelandair
15 May - 22 May British Airways
30 May - 04 Jun Iberia direct
30 May - 02 Jun Icelandair
16 May - 21 May Icelandair
16 May - 28 May Frontier Airlines
25 May - 09 Jun Iberia direct
13 May - 24 May Delta
12 May - 05 Jun Iberia direct
20 May - 05 Jun Air Canada
31 May - 07 Jun United
15 May - 27 May Air Canada
31 May - 04 Jun Alaska Airlines
22 May - 26 May KLM
22 May - 26 May Iberia direct

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

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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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