AirHint found the following cheapest return flights from Portland (PDX) to Rome (FCO) in December 2025 (see full year).

Return flights

09 Dec - 17 Dec	Icelandair
08 Dec - 15 Dec	Icelandair
08 Dec - 14 Dec	Icelandair
10 Dec - 16 Dec	Air France
02 Dec - 06 Dec	Icelandair
17 Dec - 07 Jan	Hawaiian Airlines
23 Dec - 30 Dec	Air Canada
23 Dec - 28 Dec	Air Canada
26 Dec - 30 Dec	Sun Country Airlines
30 Dec - 03 Jan	Alaska Airlines
21 Dec - 28 Dec	Alaska Airlines
18 Dec - 27 Dec	Alaska Airlines
18 Dec - 01 Jan	Hawaiian Airlines
19 Dec - 01 Jan	Frontier Airlines

Also check the deals for one-way flights from Portland to Rome in December.

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 Rome in December from $378

Return flights