AirHint found the following cheapest return flights from Phoenix (PHX) to Barcelona (BCN) in September 2025 (see full year).

Return flights

10 Sep - 17 Sep	Air Canada
02 Sep - 09 Sep	United
16 Sep - 30 Sep	British Airways
17 Sep - 24 Sep	British Airways
26 Sep - 03 Oct	United
29 Sep - 06 Oct	United
08 Sep - 22 Sep	Air Canada
08 Sep - 15 Sep	United
11 Sep - 17 Sep	Frontier Airlines
05 Sep - 12 Sep	United
11 Sep - 18 Sep	United
14 Sep - 21 Sep	United

Also check the deals for one-way flights from Phoenix to Barcelona 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.

Book a cheap hotel in Barcelona

Cheap car rent in Barcelona

Cheapest return flights from Phoenix to Barcelona in September from 509€

Return flights