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

Return flights

02 Dec - 16 Dec	British Airways
08 Dec - 15 Dec	Icelandair
05 Dec - 19 Dec	Iberia
26 Dec - 09 Jan	British Airways
03 Dec - 10 Dec	United
23 Dec - 06 Jan	Alaska Airlines
13 Dec - 20 Dec	United
23 Dec - 30 Dec	United
18 Dec - 25 Dec	United

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 431€

Return flights