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

Return flights

03 Dec - 17 Dec	British Airways
10 Dec - 17 Dec	United
30 Dec - 13 Jan	United
30 Dec - 06 Jan	United
17 Dec - 24 Dec	British Airways
22 Dec - 29 Dec	Lufthansa
19 Dec - 27 Dec	Lufthansa
19 Dec - 28 Dec	Lufthansa
21 Dec - 28 Dec	Lufthansa
20 Dec - 27 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 473€

Return flights