Cheapest return DEN–IST flights, May

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

Return flights

10 May - 27 May Lufthansa
24 May - 10 Jun Air France
24 May - 11 Jun Alaska Airlines
23 May - 04 Jun KLM
15 May - 25 May KLM
10 May - 30 May Lufthansa
23 May - 10 Jun Alaska Airlines
24 May - 09 Jun Alaska Airlines
09 May - 15 May Lufthansa
23 May - 06 Jun Frontier Airlines
13 May - 04 Jun Icelandair
10 May - 16 May Lufthansa
11 May - 14 May Lufthansa
16 May - 26 May Delta
10 May - 30 Jun Lufthansa
09 May - 12 May Aer Lingus
16 May - 07 Jun Icelandair
14 May - 31 May Delta
06 May - 13 May Delta
16 May - 07 Jun Turkish Airlines direct

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

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