AirHint found the following cheapest return flights from Denver (DEN) to Ljubljana (LJU) in April 2026 (see full year).

Return flights

14 Apr - 21 Apr	Icelandair
20 Apr - 27 Apr	Finnair
23 Apr - 30 Apr	Finnair
16 Apr - 23 Apr	Finnair
19 Apr - 26 Apr	British Airways
15 Apr - 22 Apr	British Airways
22 Apr - 29 Apr	British Airways
18 Apr - 25 Apr	Finnair
17 Apr - 24 Apr	British Airways
21 Apr - 28 Apr	Turkish Airlines

Also check the deals for one-way flights from Denver to Ljubljana in April.

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 Denver to Ljubljana in April from 599€

Return flights