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

Return flights

17 Dec - 31 Jan	Fly Jinnah
17 Dec - 19 Jan	Fly Jinnah
17 Dec - 06 Jan	Fly Jinnah
15 Dec - 30 Dec	PIA
15 Dec - 12 Jan	PIA
10 Dec - 30 Dec	PIA
10 Dec - 10 Jan	PIA
19 Dec - 24 Jan	Fly Jinnah
15 Dec - 05 Jan	Fly Jinnah
22 Dec - 31 Jan	PIA
24 Dec - 17 Jan	PIA
10 Dec - 28 Jan	PIA
10 Dec - 28 Dec	PIA
24 Dec - 31 Dec	PIA
20 Dec - 31 Dec	Fly Jinnah
16 Dec - 30 Dec	PIA
14 Dec - 29 Dec	Fly Jinnah
08 Dec - 30 Dec	PIA
09 Dec - 31 Dec	Uzbekistan Airways
10 Dec - 12 Dec	PIA

Also check the deals for one-way flights from Islamabad to London 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 Islamabad to London in December from 443€

Return flights