AirHint found the following cheapest return flights from Portland (PDX) to London (STN) in September 2026 (see full year).
Return flights
| 08 Sep - 23 Sep | Frontier Airlines | ||
| 12 Sep - 26 Sep | Icelandair | ||
| 08 Sep - 22 Sep | Frontier Airlines | ||
| 15 Sep - 22 Sep | Alaska Airlines | ||
| 15 Sep - 24 Sep | Aer Lingus | ||
| 05 Sep - 19 Sep | Icelandair |
Also check the deals for one-way flights from Portland to London in September.
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