AirHint found the following cheapest return flights from Portland (PDX) to London (STN) in May 2026 (see full year).
Return flights
| 18 May - 03 Jun | KLM | ||
| 20 May - 12 Jun | Icelandair | ||
| 27 May - 03 Jun | Icelandair | ||
| 03 May - 02 Jun | Alaska Airlines | ||
| 17 May - 02 Jun | WestJet | ||
| 01 May - 08 May | Alaska Airlines | ||
| 17 May - 01 Jun | Iberia |
Also check the deals for one-way flights from Portland to London in May.
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