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Southeast Europe

$466+ Cheap flights from Ontario (ONT) to Southeast Europe

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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Apr 9 — Apr 161
Wed 4/9
Wed 4/16
1 adult, Economy
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Cheap flight deals from Ontario to Southeast Europe

Keep the following information in mind while searching for Ontario to Southeast Europe flight deals. Data was last updated April 4, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$628
(Air Canada)

One-way from

$466
(KLM)

Popular in

June

Cheapest in

November

Average price

$708
Provider with most accurate pricing for Los Angeles-Athens Eleftherios V. flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Athens Eleftherios V. flights.
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From Ontario to Southeast Europe
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One-way flight from Ontario to Southeast Europe
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Highest demand for flights based on searches. 25% potential increase in price ($287 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from Ontario to Southeast Europe

Cheapest flights from Ontario to Southeast Europe
Explore the most affordable flight options available from Ontario to Southeast Europe. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 4, 2025.

This Booking.com deal was found by Cheapflights users on 4/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/55:01 pmONT - ZAG
2 stops18h 04mBritish Airways
Thu 11/138:55 pmZAG - ONT
2 stops29h 54mBritish Airways
Deal found 4/3$601
This Air Canada deal was found by Cheapflights users on 4/4. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/176:00 amONT - ATH
2 stops18h 05mMultiple Airlines
Fri 8/2912:10 pmATH - ONT
2 stops19h 46mMultiple Airlines
Deal found 4/4$628
This United Airlines deal was found by Cheapflights users on 4/3. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/226:39 pmONT - OTP
2 stops20h 16mUnited Airlines
Wed 9/176:05 amOTP - ONT
2 stops21h 37mUnited Airlines
Deal found 4/3$637
This British Airways deal was found by Cheapflights users on 4/4. 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 4/184:35 pmONT - ATH
2 stops23h 25mBritish Airways
Tue 5/136:55 amATH - ONT
2 stops25h 02mBritish Airways
Deal found 4/4$644
This United Airlines deal was found by Cheapflights users on 4/4. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/261:20 pmONT - ATH
2 stops34h 35mUnited Airlines
Sun 5/412:10 pmATH - ONT
2 stops34h 28mUnited Airlines
Deal found 4/4$645
This Delta deal was found by Cheapflights users on 4/4. 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.
Tue 9/309:55 amONT - ATH
2 stops27h 20mDelta
Sun 10/126:30 amATH - ONT
2 stops27h 16mDelta
Deal found 4/4$655
This United Airlines deal was found by Cheapflights users on 4/2. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/87:00 amONT - CLJ
2 stops20h 05mUnited Airlines
Sat 10/256:00 amCLJ - ONT
2 stops26h 26mUnited Airlines
Deal found 4/2$696
This United Airlines deal was found by Cheapflights users on 4/4. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:00 amONT - BEG
2 stops20h 55mUnited Airlines
Tue 12/166:20 amBEG - ONT
2 stops22h 57mUnited Airlines
Deal found 4/4$698
This KLM deal was found by Cheapflights users on 4/4. 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.
Fri 4/185:15 pmONT - ATH
2 stops22h 05mKLM
Fri 4/2510:30 amATH - ONT
1 stop18h 58mKLM
Deal found 4/4$733
This Iberia deal was found by Cheapflights users on 4/4. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/52:34 pmONT - ZAG
2 stops19h 11mIberia
Tue 8/1911:00 amZAG - ONT
2 stops21h 29mIberia
Deal found 4/4$734
This Delta deal was found by Cheapflights users on 4/3. 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.
Tue 9/97:00 amONT - DBV
2 stops20h 35mDelta
Tue 9/301:25 pmDBV - ONT
2 stops35h 49mDelta
Deal found 4/3$736
This United Airlines deal was found by Cheapflights users on 4/3. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/305:45 amONT - ZAG
2 stops23h 30mUnited Airlines
Tue 10/142:55 pmZAG - ONT
2 stops57h 51mUnited Airlines
Deal found 4/3$774

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Southeast Europe 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 April 4, 2025.
Use the filters below to find and compare flights from Ontario to Southeast Europe that are best for you.

Fly from

Ontario

Fly to

Southeast Europe

Route

Depart

Return

Price

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 8/17

6:00 am-10:05 am

2 stops18h 05m

Athens Eleftherios V.

Fri 8/29

12:10 pm-9:56 pm

2 stops19h 46m

$628

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

Tue 7/22

6:39 pm-12:55 am

2 stops20h 16m

Bucharest Otopeni Intl

Wed 9/17

6:05 am-5:42 pm

2 stops21h 37m

$637

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 4/18

4:35 pm-2:00 am

2 stops23h 25m

Athens Eleftherios V.

Tue 5/13

6:55 am-9:57 pm

2 stops25h 02m

$644

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 4/26

1:20 pm-9:55 am

2 stops34h 35m

Athens Eleftherios V.

Sun 5/4

12:10 pm-12:38 pm

2 stops34h 28m

$645

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 9/30

9:55 am-11:15 pm

2 stops27h 20m

Athens Eleftherios V.

Sun 10/12

6:30 am-11:46 pm

2 stops27h 16m

$655

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 4/18

5:15 pm-1:20 am

2 stops22h 05m

Athens Eleftherios V.

Fri 4/25

10:30 am-7:28 pm

1 stop18h 58m

$733

OntarioZagreb

ONT - ZAG

ONTZAG

Ontario

Tue 8/5

2:34 pm-6:45 pm

2 stops19h 11m

Zagreb Franjo Tuđman

Tue 8/19

11:00 am-11:29 pm

2 stops21h 29m

$734

OntarioDubrovnik

ONT - DBV

ONTDBV

Ontario

Tue 9/9

7:00 am-12:35 pm

2 stops20h 35m

Dubrovnik

Tue 9/30

1:25 pm-4:14 pm

2 stops35h 49m

$736

OntarioBelgrade

ONT - BEG

ONTBEG

Ontario

Mon 9/1

6:36 pm-12:35 pm

2 stops32h 59m

Belgrade Nikola Tesla

Mon 9/15

1:55 pm-5:42 pm

2 stops36h 47m

$773

OntarioZagreb

ONT - ZAG

ONTZAG

Ontario

Tue 9/30

5:45 am-2:15 pm

2 stops23h 30m

Zagreb Franjo Tuđman

Tue 10/14

2:55 pm-3:46 pm

2 stops57h 51m

$774

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/2

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Southeast Europe

Have a flexible travel schedule? Discover the best time to fly to Southeast Europe 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 Southeast Europe

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

Currently, November is the cheapest month in which you can book a flight from Ontario to Southeast Europe (average of $679). Flying from Ontario to Southeast Europe in June is currently the most expensive (average of $1,340). 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.

What is the cheapest time of day to fly from ONT to YMH?

Find hourly flight availability from Ontario to Southeast Europe. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 4, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Southeast Europe as you normally would.

Rainfall in Southeast Europe by month

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

In terms of precipitation, rainfall in Southeast Europe ranges from 0.2 - 2.5 inches per month. December is typically the wettest month, when rainfall can reach 2.5 in. June is typically the driest time to visit Southeast Europe when rainfall is around 0.2 in.

Temperature in Southeast Europe by month

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

If weather is an important factor for your trip to Southeast Europe, 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 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 50.0 F).

Reviews of airlines servicing Southeast Europe

Get insights into the airlines that provide service to Southeast Europe. 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 Southeast Europe. Reviews last updated April 4, 2025.
To help decide which airline to fly from Ontario to Southeast Europe, see what other customers have to say about Delta, KLM and Air France. 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
7,899 reviews

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Boarding

8.2

Food

7.3

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
7,899 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Boarding

8.2

Food

7.3

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
1,322 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Boarding

8.2

Food

7.3

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 France
7.4
Good
1,427 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Boarding

8.2

Food

7.3

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.
United Airlines
7.4
Good
8,618 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Boarding

8.2

Food

7.3

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.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,899 reviews

Entertainment

7.9

Overall

8.0

Comfort

8.0

Crew

8.5

Boarding

8.2

Food

7.3

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 Southeast Europe. 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 Southeast Europe?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Southeast Europe.

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

    The cheapest airlines for a one-way flight from Ontario to Southeast Europe are KLM ($466), Delta ($469), and United Airlines ($475).

  • What are the most popular routes from Ontario to Southeast Europe?

    The most popular flight routes from Ontario to Southeast Europe are Ontario - Athens Eleftherios V., Ontario - Dubrovnik and Ontario - Bucharest Otopeni Intl.

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

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

  • How can I find direct flights from Ontario to Southeast Europe?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Southeast Europe 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 Southeast Europe?

    Currently, November is the cheapest month in which you can book a flight from Ontario to Southeast Europe (average of $679). Flying from Ontario to Southeast Europe in June is currently the most expensive (average of $1,340). 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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Alternative routes for Ontario to Southeast Europe

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Southeast Europe

Discover the top 5 airlines that operate flights from Ontario to Southeast Europe. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$537Average$894FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$550Average$1,098FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$552Average$825FlexibilityNo cancel feeOn-time71%
DeltaCheapest$571Average$812FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$602Average$1,371FlexibilityNo cancel feeOn-time75%

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