AirHint found the following cheapest return flights from Washington (IAD) to Islamabad (ISB) in December 2025 (see full year).

Return flights

31 Dec - 31 Jan	Frontier Airlines
31 Dec - 22 Jan	Turkish Airlines
08 Dec - 16 Dec	Etihad Airways
27 Dec - 20 Jan	Etihad Airways
31 Dec - 14 Jan	Frontier Airlines
31 Dec - 15 Jan	Frontier Airlines
09 Dec - 18 Dec	EgyptAir
08 Dec - 21 Jan	Etihad Airways
29 Dec - 30 Jan	Saudia
27 Dec - 13 Jan	Etihad Airways
08 Dec - 20 Jan	Etihad Airways
28 Dec - 13 Jan	Turkish Airlines
06 Dec - 13 Dec	Etihad Airways
10 Dec - 17 Dec	Etihad Airways
05 Dec - 12 Dec	SWISS
11 Dec - 25 Dec	Aer Lingus
02 Dec - 08 Dec	Turkish Airlines
15 Dec - 20 Dec	Aer Lingus
13 Dec - 29 Dec	Aer Lingus
13 Dec - 20 Dec	Lufthansa

Also check the deals for one-way flights from Washington to Islamabad 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 Washington to Islamabad in December from 949€

Return flights