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$616+ 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 7/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LJU
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$938
(United)

One-way from

$616
(Gotogate)

Popular in

June

Cheapest in

March

Average price

$1,558
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. 20% potential increase in price ($247 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($56 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This United deal was found by Cheapflights users on 6/9. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/47:00 amONT - LJU
2 stops17h 55mMultiple Airlines
Mon 11/106:45 amLJU - ONT
2 stops19h 49mMultiple Airlines
Deal found 6/9$938
This British Airways deal was found by Cheapflights users on 6/10. 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.
Fri 8/14:45 pmONT - LJU
2 stops17h 35mBritish Airways
Mon 8/183:10 pmLJU - ONT
2 stops33h 56mBritish Airways
Deal found 6/10$1,221
This Air Serbia deal was found by Cheapflights users on 6/12. 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 Air Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/2711:59 pmONT - LJU
2 stops24h 01mAir Serbia
Sun 8/32:55 pmLJU - ONT
2 stops40h 14mAir Serbia
Deal found 6/12$1,371
This KLM deal was found by Cheapflights users on 6/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/21:15 pmONT - LJU
2 stops15h 20mKLM
Sat 8/2312:20 pmLJU - ONT
2 stops19h 22mKLM
Deal found 6/12$2,952

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 June 12, 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

Sat 8/16

6:00 am-7:15 pm

2 stops28h 15m

Ljubljana Joze Pucnik

Sat 8/30

9:25 am-10:44 am

2 stops34h 19m

$1,035

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Fri 8/1

4:45 pm-7:20 pm

2 stops17h 35m

Ljubljana Joze Pucnik

Mon 8/18

3:10 pm-4:06 pm

2 stops33h 56m

$1,221

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Sun 7/27

11:59 pm-9:00 am

2 stops24h 01m

Ljubljana Joze Pucnik

Sun 8/3

2:55 pm-10:09 pm

2 stops40h 14m

$1,371

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Sat 8/2

1:15 pm-1:35 pm

2 stops15h 20m

Ljubljana Joze Pucnik

Sat 8/23

12:20 pm-10:42 pm

2 stops19h 22m

$2,952

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Thu 7/17

4:45 pm-8:20 pm

2 stops18h 35m

$616

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Thu 7/3

10:05 pm-11:35 am

2 stops28h 30m

$618

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Wed 7/2

2:21 pm-7:15 pm

2 stops19h 54m

$772

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Sun 6/29

11:59 pm-9:00 am

2 stops24h 01m

$1,131

OntarioLjubljana

ONT - LJU

ONTLJU

Ontario

Thu 6/19

7:05 am-11:05 am

2 stops19h 00m

$1,495

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 $1,462). 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.

Rainfall in Slovenia by month

Plan your trip to Slovenia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Slovenia ranges from 1.6 - 2.8 inches per month. October is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Slovenia when rainfall is around 1.6 in.

Temperature in Slovenia by month

Plan your trip to Slovenia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Slovenia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 June 12, 2025.
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

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
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

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.
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

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
7,008 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

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
7,950 reviews

Overall

8.0

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Crew

8.5

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.

  • What are the cheapest airlines to fly from Ontario to Slovenia one-way?

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as $616. Users have also found prices from $618 and $1,131 on Delta and Air Serbia, respectively.

  • 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 $1,462). 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.

See more FAQs

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