Cheapest return flights from Portland to Lisbon in May from $510

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

Return flights

02 May - 09 May British Airways
04 May - 12 May Finnair
05 May - 13 May Finnair
11 May - 19 May Finnair
06 May - 14 May Finnair
07 May - 15 May British Airways
03 May - 11 May Finnair
02 May - 10 May Icelandair
09 May - 17 May Delta
19 May - 27 May Icelandair
23 May - 06 Jun Icelandair
24 May - 01 Jun WestJet
27 May - 04 Jun Alaska Airlines
25 May - 02 Jun WestJet
31 May - 08 Jun Alaska Airlines
29 May - 06 Jun Icelandair
26 May - 03 Jun WestJet
28 May - 05 Jun Alaska Airlines
30 May - 07 Jun Icelandair

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

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