AirHint found the following cheapest return flights from Philadelphia (PHL) to Amsterdam (AMS) in September 2025 (see full year).

Return flights

07 Sep - 19 Sep	Aer Lingus
07 Sep - 19 Sep	Finnair	direct
03 Sep - 10 Sep	Aer Lingus
02 Sep - 09 Sep	United
12 Sep - 17 Sep	British Airways	direct
05 Sep - 12 Sep	United
11 Sep - 16 Sep	Aer Lingus
11 Sep - 18 Sep	United
23 Sep - 30 Sep	United
08 Sep - 15 Sep	United
29 Sep - 06 Oct	United
26 Sep - 03 Oct	United

Also check the deals for one-way flights from Philadelphia to Amsterdam in September.

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 Philadelphia to Amsterdam in September from 503€

Return flights