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

Return flights

07 May - 30 May	Air France
12 May - 06 Jun	KLM
10 May - 06 Jun	Air France
30 May - 07 Jun	KLM
30 May - 05 Jun	Air France
20 May - 06 Jun	Lufthansa
07 May - 30 May	Turkish Airlines	direct
12 May - 06 Jun	Turkish Airlines	direct
10 May - 06 Jun	Turkish Airlines	direct
20 May - 06 Jun	Turkish Airlines	direct
11 May - 15 May	Delta
30 May - 05 Jun	Turkish Airlines	direct
30 May - 07 Jun	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 717€

Return flights