AirHint found the following cheapest return flights from Kansas City (MCI) to Ljubljana (LJU) in September 2025 (see full year).

Return flights

03 Sep - 10 Sep	SWISS
10 Sep - 17 Sep	SWISS
02 Sep - 09 Sep	Delta
09 Sep - 16 Sep	Delta
19 Sep - 26 Sep	Spirit Airlines
28 Sep - 05 Oct	Spirit Airlines
27 Sep - 04 Oct	Spirit Airlines
20 Sep - 27 Sep	Spirit Airlines
30 Sep - 07 Oct	Spirit Airlines
11 Sep - 18 Sep	Delta
01 Sep - 08 Sep	Delta
26 Sep - 03 Oct	Spirit Airlines
04 Sep - 11 Sep	Delta
21 Sep - 28 Sep	Spirit Airlines
24 Sep - 01 Oct	Delta
29 Sep - 06 Oct	Spirit Airlines
25 Sep - 02 Oct	Delta

Also check the deals for one-way flights from Kansas City to Ljubljana 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 Kansas City to Ljubljana in September from $792

Return flights