AirHint found the following cheapest return flights from London (LCY) to Istanbul (IST) in April 2026 (see full year).

Return flights

08 Apr - 05 May	Lufthansa
15 Apr - 21 Apr	Lufthansa
15 Apr - 22 Apr	Lufthansa
14 Apr - 20 Apr	Lufthansa
02 Apr - 07 Apr	Lufthansa
02 Apr - 09 Apr	Lufthansa
02 Apr - 06 Apr	KLM
03 Apr - 06 Apr	KLM
01 Apr - 06 Apr	KLM
01 Apr - 19 Apr	Lufthansa
04 Apr - 09 Apr	KLM

Also check the deals for one-way flights from London to Istanbul 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 Istanbul in April from $312

Return flights