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

Return flights

04 May - 15 May	Scandinavian Airlines
08 May - 15 May	Icelandair
11 May - 09 Jun	Air France
10 May - 05 Jun	Air France
13 May - 21 May	Scandinavian Airlines
13 May - 10 Jun	Air France
12 May - 26 May	British Airways
09 May - 23 May	Icelandair
16 May - 23 May	Icelandair
14 May - 24 Jun	Icelandair
03 May - 09 May	British Airways
14 May - 29 May	Icelandair
16 May - 21 May	Scandinavian Airlines
14 May - 12 Jun	Air France
14 May - 30 May	Icelandair
27 May - 10 Jun	Air France
31 May - 08 Jun	KLM
22 May - 04 Jun	KLM
23 May - 06 Jun	KLM
25 May - 19 Jun	KLM

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 $646

Return flights