AirHint found the following cheapest return flights from Portland (PDX) to Ljubljana (LJU) in September 2026 (see full year).
Return flights
| 21 Sep - 28 Sep | Air Canada | ||
| 20 Sep - 27 Sep | Air Canada | ||
| 19 Sep - 26 Sep | Air Canada |
Also check the deals for one-way flights from Portland to Ljubljana in September.
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