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

Return flights

11 Dec - 12 Jan	Icelandair
01 Dec - 10 Dec	Icelandair
04 Dec - 17 Dec	Icelandair
31 Dec - 10 Jan	Lufthansa
10 Dec - 10 Jan	Air Canada
06 Dec - 12 Dec	Air Canada
29 Dec - 12 Jan	KLM
07 Dec - 21 Dec	Delta
16 Dec - 25 Dec	Air France
01 Dec - 22 Dec	Air Canada
07 Dec - 10 Dec	Scandinavian Airlines
16 Dec - 10 Jan	Alaska Airlines
26 Dec - 09 Jan	Austrian Airlines
31 Dec - 06 Jan	Lufthansa
23 Dec - 17 Jan	Alaska Airlines
05 Dec - 27 Dec	WestJet
21 Dec - 10 Jan	Sun Country Airlines
25 Dec - 05 Jan	Hawaiian Airlines
20 Dec - 27 Dec	Sun Country 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 $395

Return flights