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

Return flights

11 Apr - 14 Apr	KLM
11 Apr - 15 Apr	KLM
01 Apr - 15 Apr	KLM
11 Apr - 19 Apr	KLM
08 Apr - 15 Apr	KLM
08 Apr - 19 Apr	KLM
01 Apr - 08 Apr	KLM
14 Apr - 19 Apr	KLM
17 Apr - 19 Apr	KLM
08 Apr - 14 Apr	KLM
30 Apr - 06 May	KLM
29 Apr - 08 May	KLM
30 Apr - 03 May	KLM
28 Apr - 05 May	Lufthansa
28 Apr - 08 May	Lufthansa
27 Apr - 08 May	Lufthansa
29 Apr - 02 May	KLM
21 Apr - 01 May	Lufthansa
29 Apr - 01 May	Lufthansa
24 Apr - 01 May	Lufthansa

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 $254

Return flights