Cheapest return flights from Washington to Kathmandu in September from $790

AirHint found the following cheapest return flights from Washington (IAD) to Kathmandu (KTM) in September 2025 (see full year).

Return flights

09 Sep - 22 Sep Air India
16 Sep - 14 Oct Air India
16 Sep - 07 Oct Air India
21 Sep - 04 Oct Air India
23 Sep - 14 Oct Air India
13 Sep - 11 Oct Air India
23 Sep - 24 Oct Air India
19 Sep - 31 Oct Air India
20 Sep - 31 Oct Air India
20 Sep - 04 Oct Air India
01 Sep - 31 Oct Turkish Airlines

Also check the deals for one-way flights from Washington to Kathmandu in September.

Skyscanner

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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