AirHint found the following cheapest return flights from Houston (IAH) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

10 Dec - 18 Jan	IndiGo
16 Dec - 18 Jan	Delta
11 Dec - 18 Jan	Delta
15 Dec - 18 Jan	Alaska Airlines
13 Dec - 18 Jan	Singapore Airlines
12 Dec - 18 Jan	Singapore Airlines
18 Dec - 19 Jan	IndiGo
17 Dec - 18 Jan	IndiGo
18 Dec - 18 Jan	IndiGo
14 Dec - 18 Jan	Delta

Also check the deals for one-way flights from Houston to Kathmandu in December.

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 Houston to Kathmandu in December from 1519€

Return flights