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$651+ Cheap flights from Ontario (ONT) to Slovenia

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LJU
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from Ontario to Slovenia

Keep the following information in mind while searching for Ontario to Slovenia flight deals. Data was last updated July 30, 2025.

Round-trip from

$718
(Delta)

One-way from

$651
(Air Serbia)

Popular in

December

Cheapest in

November

Average price

$1,090
From Ontario to Slovenia
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One-way flight from Ontario to Slovenia
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Highest demand for flights based on searches. 6% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($72 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Slovenia

Cheapest flights from Ontario to Slovenia
Explore the most affordable flight options available from Ontario to Slovenia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/126:00 amONT - LJU
2 stops20h 40mDelta
Sun 11/1612:50 pmLJU - ONT
2 stops42h 51mDelta
Deal found 7/28$718
This Lufthansa deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2211:59 pmONT - LJU
2 stops24h 56mMultiple Airlines
Sun 1/410:35 amLJU - ONT
2 stops18h 42mMultiple Airlines
Deal found 7/30$1,932
This British Airways deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1112:47 pmONT - LJU
2 stops18h 23mBritish Airways
Tue 8/265:00 pmLJU - ONT
2 stops34h 24mBritish Airways
Deal found 7/30$1,994

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Slovenia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 30, 2025.
Use the filters below to find and compare flights from Ontario to Slovenia that are best for you.

Fly from

Ontario

Fly to

Slovenia

Route

Depart

Return

Price

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Wed 11/12

6:00 am-11:40 am

2 stops20h 40m

Ljubljana Joze Pucnik

Sun 11/16

12:50 pm-10:41 pm

2 stops42h 51m

$718

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Mon 12/22

11:59 pm-9:55 am

2 stops24h 56m

Ljubljana Joze Pucnik

Sun 1/4

10:35 am-8:17 pm

2 stops18h 42m

$1,932

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Mon 8/11

12:47 pm-4:10 pm

2 stops18h 23m

Ljubljana Joze Pucnik

Tue 8/26

5:00 pm-6:24 pm

2 stops34h 24m

$1,994

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Mon 9/15

10:56 pm-9:00 am

2 stops25h 04m

$651

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Best time to book a flight from Ontario to Slovenia

Have a flexible travel schedule? Discover the best time to fly to Slovenia from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Slovenia

What is the cheapest month to book a flight from Ontario to Slovenia?

Currently, February is the cheapest month in which you can book a flight from Ontario to Slovenia (average of $710). Flying from Ontario to Slovenia in June is currently the most expensive (average of $1,443). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Slovenia

Get insights into the airlines that provide service to Slovenia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Slovenia. Reviews last updated July 30, 2025.
Peruse reviews from past customers who have flown with Delta, British Airways, and Air Serbia from Ontario to Slovenia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
British Airways
6.6
Okay
7,217 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Serbia
6.3
Okay
196 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Slovenia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Slovenia?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Slovenia. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • Can I find deals for flights from Ontario to Slovenia that include hotel bookings?

    Yes. In addition to deals on Ontario to Slovenia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Slovenia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Slovenia.

  • Can I find deals for business class flights from Ontario to Slovenia?

    Yes. Cheapflights offers flight deals from Ontario to Slovenia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Slovenia?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Slovenia (average of $710). Flying from Ontario to Slovenia in June is currently the most expensive (average of $1,443). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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