AirHint found the following cheapest return flights from Portland (PDX) to London (LGW) in March 2026 (see full year).
Return flights
| 09 Mar - 15 Mar | Icelandair | ||
| 30 Mar - 07 Apr | Alaska Airlines | ||
| 16 Mar - 11 Apr | Icelandair | ||
| 29 Mar - 12 Apr | Hawaiian Airlines | ||
| 21 Mar - 29 Mar | Icelandair |
Also check the deals for one-way flights from Portland to London in March.
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