AirHint found the following cheapest return flights from London (LHR) to Islamabad (ISB) in April 2026 (see full year).

Return flights

05 Apr - 20 May	Air Serbia
05 Apr - 10 May	Air Serbia
05 Apr - 03 May	Air Serbia
05 Apr - 07 May	Air Serbia
05 Apr - 11 May	Air Serbia
05 Apr - 02 May	Air Serbia
26 Apr - 18 May	Air Serbia
05 Apr - 30 Apr	Air Serbia
05 Apr - 29 Apr	Air Serbia
05 Apr - 28 Apr	Air Serbia
11 Apr - 02 May	Air Serbia
23 Apr - 16 May	SWISS
15 Apr - 07 May	Eurowings
05 Apr - 26 Apr	Air Serbia
05 Apr - 25 Apr	Air Serbia
23 Apr - 29 Apr	Saudia
09 Apr - 28 Apr	Saudia
15 Apr - 28 Apr	Saudia
12 Apr - 29 Apr	Saudia
09 Apr - 29 Apr	Saudia

Also check the deals for one-way flights from London to Islamabad in April.

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 London to Islamabad in April from 534€

Return flights