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

Return flights

31 Dec - 15 Jan	Turkish Airlines
31 Dec - 28 Jan	Turkish Airlines
31 Dec - 29 Jan	Lufthansa
31 Dec - 14 Jan	Turkish Airlines
03 Dec - 10 Dec	SWISS
27 Dec - 14 Jan	Turkish Airlines
27 Dec - 22 Jan	Turkish Airlines
03 Dec - 22 Dec	SWISS
02 Dec - 09 Dec	Delta
27 Dec - 26 Jan	Turkish Airlines
04 Dec - 11 Dec	Air Canada
27 Dec - 31 Jan	Turkish Airlines
27 Dec - 25 Jan	Turkish Airlines
27 Dec - 27 Jan	Turkish Airlines
03 Dec - 21 Dec	SWISS
06 Dec - 17 Dec	SWISS
04 Dec - 23 Dec	Hainan Airlines
06 Dec - 13 Dec	Air Canada
02 Dec - 15 Dec	Air Canada
08 Dec - 16 Dec	Lufthansa

Also check the deals for one-way flights from Seattle to Mumbai 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 Mumbai in December from $843

Return flights