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

Return flights

01 Sep - 04 Sep	Air India	direct
01 Sep - 12 Sep	SpiceJet	direct
01 Sep - 10 Sep	SpiceJet	direct
07 Sep - 13 Sep	IndiGo	direct
01 Sep - 13 Sep	IndiGo	direct
29 Sep - 06 Oct	IndiGo	direct
26 Sep - 29 Sep	Air India	direct
12 Sep - 24 Sep	Air India	direct
15 Sep - 19 Sep	Air India	direct
16 Sep - 23 Sep	SpiceJet	direct

Also check the deals for one-way flights from Kathmandu to Delhi 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 Kathmandu to Delhi in September from $167

Return flights