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

Return flights

10 May - 05 Jun	KLM
14 May - 19 May	Icelandair
19 May - 03 Jun	KLM
17 May - 26 May	Icelandair
18 May - 28 May	Lufthansa
20 May - 03 Jun	Lufthansa
19 May - 07 Jun	Icelandair
26 May - 10 Jun	KLM
17 May - 31 May	KLM
30 May - 06 Jun	KLM
31 May - 07 Jun	KLM
31 May - 05 Jun	KLM
25 May - 22 Jun	KLM
17 May - 26 May	Turkish Airlines	direct
18 May - 28 May	Turkish Airlines	direct
20 May - 03 Jun	Turkish Airlines	direct
17 May - 31 May	Turkish Airlines	direct

Also check the deals for one-way flights from Washington 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 Washington to Istanbul in May from 588€

Return flights