Cheapest return flights from Portland to London in March from $672

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 March 2025 (see full year).

Return flights

03 Mar - 19 Mar Air Canada
11 Mar - 19 Mar British Airways
11 Mar - 19 Mar Finnair direct
03 Mar - 21 Mar Delta
11 Mar - 18 Mar Delta
18 Mar - 11 Apr Air Canada
19 Mar - 03 Apr Air Canada
11 Mar - 18 Mar American Airlines direct
23 Mar - 31 Mar Air Canada
04 Mar - 16 Mar Air France
18 Mar - 11 Apr Iberia direct
04 Mar - 16 Mar Finnair direct
11 Mar - 23 Mar Delta
19 Mar - 03 Apr British Airways direct

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

Skyscanner

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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