AirHint found the following cheapest return flights from Philadelphia (PHL) to Istanbul (IST) in August 2025 (see full year).

Return flights

16 Aug - 23 Aug	Spirit Airlines
17 Aug - 24 Aug	Frontier Airlines
17 Aug - 23 Aug	British Airways
23 Aug - 28 Aug	Spirit Airlines
06 Aug - 20 Aug	British Airways
07 Aug - 14 Aug	Frontier Airlines
03 Aug - 13 Aug	British Airways
05 Aug - 09 Aug	Frontier Airlines

Also check the deals for one-way flights from Philadelphia to Istanbul in August.

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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from Philadelphia to Istanbul in August from 714€

Return flights