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

Return flights

30 Sep - 07 Oct	Turkish Airlines
24 Sep - 01 Oct	SWISS
20 Sep - 29 Sep	Delta
23 Sep - 30 Sep	Delta
20 Sep - 27 Sep	Delta
22 Sep - 29 Sep	Delta
24 Sep - 02 Oct	Delta
27 Sep - 04 Oct	Delta
28 Sep - 05 Oct	Delta
29 Sep - 06 Oct	Delta
30 Sep - 14 Oct	Delta
24 Sep - 12 Oct	Delta
23 Sep - 08 Oct	Delta
24 Sep - 08 Oct	Delta
25 Sep - 30 Sep	Virgin Atlantic
25 Sep - 29 Sep	Virgin Atlantic
22 Sep - 26 Sep	Delta
19 Sep - 29 Sep	SWISS
21 Sep - 28 Sep	Air Canada
19 Sep - 26 Sep	SWISS

Also check the deals for one-way flights from Seattle to Mumbai 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 Seattle to Mumbai in September from $705

Return flights