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

Return flights

23 Sep - 04 Oct	Air India
26 Sep - 04 Oct	Air India
23 Sep - 18 Oct	Air India
23 Sep - 30 Oct	Air India
10 Sep - 20 Sep	Lufthansa
10 Sep - 17 Sep	Lufthansa
09 Sep - 13 Sep	Air France
05 Sep - 13 Sep	KLM
12 Sep - 03 Oct	Air France
17 Sep - 24 Sep	Delta
11 Sep - 25 Sep	Delta
11 Sep - 26 Sep	Delta
08 Sep - 02 Oct	Lufthansa
06 Sep - 13 Sep	SWISS
02 Sep - 02 Oct	Air France
05 Sep - 12 Sep	Delta

Also check the deals for one-way flights from Mumbai to Seattle in September.

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 Mumbai to Seattle in September from 737€

Return flights