AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in March 2026 (see full year).

Return flights

04 Mar - 11 Mar	Scandinavian Airlines
03 Mar - 10 Mar	Air Canada
02 Mar - 09 Mar	Air Canada
10 Mar - 17 Mar	United
09 Mar - 16 Mar	Air Canada
24 Mar - 31 Mar	Lufthansa
11 Mar - 18 Mar	Air France
12 Mar - 19 Mar	Lufthansa
16 Mar - 23 Mar	Lufthansa
17 Mar - 24 Mar	Lufthansa
25 Mar - 01 Apr	Lufthansa
31 Mar - 07 Apr	Air Canada
26 Mar - 02 Apr	Air Canada
30 Mar - 06 Apr	KLM
28 Mar - 04 Apr	Icelandair
29 Mar - 05 Apr	Air France
18 Mar - 11 Apr	British Airways
27 Mar - 03 Apr	British Airways

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

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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Cheapest return flights from Portland to Lisbon in March from 458€

Return flights