AirHint found the following cheapest one-way flights from Portland (PDX) to London (LHR) in March 2026 (see full year).
One-Way flights
| 16 Mar | Icelandair | ||
| 02 Mar | Frontier Airlines | ||
| 01 Mar | Allegiant Air | ||
| 02 Mar | British Airways | direct | |
| 01 Mar | British Airways | direct | |
| 28 Mar | United | ||
| 20 Mar | Air Canada | ||
| 20 Mar | Iberia | direct |
Also check the deals for return flights from Portland to London in March.
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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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