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

Return flights

20 May - 03 Jun	KLM
05 May - 09 May	KLM
06 May - 09 May	KLM
28 May - 02 Jun	KLM
05 May - 09 Jun	KLM
26 May - 02 Jun	KLM
04 May - 09 May	KLM
26 May - 01 Jun	KLM
02 May - 09 May	KLM
19 May - 26 May	KLM
10 May - 14 May	KLM
03 May - 09 May	KLM
30 May - 03 Jun	KLM
27 May - 02 Jun	KLM
29 May - 24 Jun	KLM
08 May - 14 May	KLM
20 May - 24 May	KLM
12 May - 16 May	KLM
12 May - 20 Jun	KLM
25 May - 02 Jun	KLM

Also check the deals for one-way flights from London to Istanbul in May.

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 May from 205€

Return flights