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

One-Way flights

21 Sep	Air India	direct
09 Sep	Air India	direct
17 Sep	Air India	direct
01 Sep	Air India	direct
12 Sep	SpiceJet	direct
03 Sep	SpiceJet	direct
14 Sep	SpiceJet	direct
16 Sep	Air India	direct
28 Sep	IndiGo	direct
02 Sep	flydubai

Also check the deals for return 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 one-way flights from Kathmandu to Delhi in September from $103

One-Way flights