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

Return flights

09 Dec - 14 Dec	American Airlines
16 Dec - 25 Dec	British Airways
02 Dec - 16 Dec	WestJet
08 Dec - 15 Dec	Icelandair
05 Dec - 19 Dec	Icelandair
15 Dec - 22 Dec	Icelandair
21 Dec - 10 Jan	Air Canada
20 Dec - 10 Jan	Alaska 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 $506

Return flights