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

Return flights

08 Dec - 15 Dec	Icelandair
04 Dec - 17 Dec	Icelandair
09 Dec - 23 Dec	Icelandair
31 Dec - 14 Jan	Air France
11 Dec - 11 Jan	Icelandair
15 Dec - 24 Dec	United
13 Dec - 22 Dec	United
12 Dec - 11 Jan	Air France
28 Dec - 11 Jan	Delta
01 Dec - 22 Dec	Delta
02 Dec - 27 Dec	WestJet
22 Dec - 17 Jan	Frontier Airlines
06 Dec - 27 Dec	Hawaiian Airlines
07 Dec - 27 Dec	WestJet
21 Dec - 10 Jan	Hawaiian Airlines
23 Dec - 30 Dec	Hawaiian Airlines
10 Dec - 03 Jan	Hawaiian Airlines
20 Dec - 10 Jan	Hawaiian Airlines
13 Dec - 03 Jan	Hawaiian Airlines
23 Dec - 04 Jan	Hawaiian Airlines

Also check the deals for one-way flights from Seattle 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 Seattle to Rome in December from 369€

Return flights