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Southeast Europe

$384+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
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 septiembre 16, 2025.

Round-trip from

$470
(American Airlines)

One-way from

$384
(Travelocity)

Popular in

June

Cheapest in

February

Average price

$707
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. 19% potential increase in price ($186 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 16, 2025.

This Air France deal was found by Cheapflights users on 9/16. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/2911:36 amONT - OTP
2 stops19h 14mAir France
mar. 11/118:40 amOTP - ONT
2 stops24h 24mAir France
Deal found 9/16$478
This Delta deal was found by Cheapflights users on 9/16. 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.
mar. 10/2811:36 amONT - OTP
2 stops26h 14mDelta
mar. 11/116:05 amOTP - ONT
2 stops26h 50mDelta
Deal found 9/16$486
This KLM deal was found by Cheapflights users on 9/16. 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.
lun. 10/279:50 amONT - OTP
2 stops20h 35mMultiple Airlines
mié. 11/128:40 amOTP - ONT
2 stops24h 24mMultiple Airlines
Deal found 9/16$491
This Delta deal was found by Cheapflights users on 9/16. 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.
lun. 10/277:35 amONT - OTP
2 stops44h 25mDelta
lun. 11/101:55 pmOTP - ONT
2 stops37h 14mDelta
Deal found 9/16$500
This Delta deal was found by Cheapflights users on 9/16. 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.
dom. 10/2610:00 pmONT - OTP
2 stops54h 00mDelta
jue. 11/136:00 amOTP - ONT
2 stops27h 04mDelta
Deal found 9/16$505
This Delta deal was found by Cheapflights users on 9/16. 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.
dom. 10/2610:00 pmONT - OTP
2 stops54h 00mDelta
vie. 11/141:55 pmOTP - ONT
2 stops30h 45mDelta
Deal found 9/16$511
This United Airlines deal was found by Cheapflights users on 9/15. 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.
mar. 10/281:40 pmONT - OTP
2 stops25h 15mUnited Airlines
mar. 11/112:50 pmOTP - ONT
2 stops18h 01mUnited Airlines
Deal found 9/15$526
This Air France deal was found by Cheapflights users on 9/16. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/2911:36 amONT - OTP
2 stops19h 14mAir France
lun. 11/108:40 amOTP - ONT
2 stops24h 24mAir France
Deal found 9/16$528
This United Airlines deal was found by Cheapflights users on 9/15. 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.
dom. 10/198:16 pmONT - CLJ
2 stops35h 04mUnited Airlines
lun. 11/32:25 pmCLJ - ONT
2 stops38h 11mUnited Airlines
Deal found 9/15$528
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/3010:57 amONT - ATH
2 stops22h 53mAmerican Airlines
jue. 11/67:30 amATH - ONT
2 stops23h 41mAmerican Airlines
Deal found 9/15$530
This Tripair deal was found by Cheapflights users on 9/14. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/36:38 pmONT - ATH
2 stops44h 17mUnited Airlines
mié. 11/1911:55 amATH - ONT
2 stops34h 42mUnited Airlines
Deal found 9/14$535
This oojo deal was found by Cheapflights users on 9/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/292:51 pmONT - OTP
2 stops23h 39mBritish Airways
mié. 11/53:50 pmOTP - ONT
2 stops40h 33mBritish Airways
Deal found 9/16$538

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 septiembre 16, 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

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

mar. 10/28

11:36 am-10:50 pm

2 stops26h 14m

Bucharest Otopeni Intl

mar. 11/11

6:05 am-10:55 pm

2 stops26h 50m

$486

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

lun. 10/27

9:50 am-3:25 pm

2 stops20h 35m

Bucharest Otopeni Intl

mié. 11/12

8:40 am-11:04 pm

2 stops24h 24m

$491

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

lun. 10/27

11:48 am-3:25 pm

2 stops18h 37m

Bucharest Otopeni Intl

mar. 11/11

8:40 am-11:04 pm

2 stops24h 24m

$491

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

mar. 1/13

3:00 pm-10:55 pm

2 stops21h 55m

Bucharest Otopeni Intl

mar. 1/27

8:00 am-10:02 pm

2 stops24h 02m

$493

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

lun. 10/27

7:35 am-1:00 pm

2 stops44h 25m

Bucharest Otopeni Intl

lun. 11/10

1:55 pm-5:09 pm

2 stops37h 14m

$500

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

dom. 10/26

10:00 pm-1:00 pm

2 stops54h 00m

Bucharest Otopeni Intl

jue. 11/13

6:00 am-11:04 pm

2 stops27h 04m

$505

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

mar. 10/28

7:05 am-1:00 pm

2 stops20h 55m

Bucharest Otopeni Intl

vie. 11/14

1:55 pm-10:40 am

2 stops30h 45m

$505

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

lun. 10/27

10:00 pm-1:00 pm

2 stops30h 00m

Bucharest Otopeni Intl

vie. 11/14

1:55 pm-10:40 am

2 stops30h 45m

$505

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

dom. 10/26

10:00 pm-1:00 pm

2 stops54h 00m

Bucharest Otopeni Intl

vie. 11/14

1:55 pm-10:40 am

2 stops30h 45m

$511

OntarioBucharest

ONT - OTP

ONTOTP

Ontario

dom. 10/26

1:40 pm-11:50 pm

2 stops25h 10m

Bucharest Otopeni Intl

jue. 11/13

5:50 am-10:51 pm

3 stops27h 01m

$526

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 $1,282). 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 septiembre 16, 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.

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 septiembre 16, 2025.
Get a feel of what it's like to fly with Delta and United Airlines from Ontario to Southeast Europe by reading reviews from past customers. 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
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

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
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

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
8,924 reviews
Delta
8.0
Very good
7,957 reviews

Comfort

7.9

Entertainment

7.9

Crew

8.5

Overall

8.0

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.

  • How long is the flight from Ontario to Southeast Europe?

    Departing from Ontario to Southeast Europe will take you 21h 55m. The distance between Ontario and Southeast Europe is about 6541 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 British Airways ($384), Air Canada ($385), and United Airlines ($389).

  • 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 - Bucharest Otopeni Intl and Ontario - Belgrade Nikola Tesla.

  • 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 $1,282). 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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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 2 airlines flying from Ontario to Southeast Europe

Discover the top 2 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 septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$955FlexibilityNo cancel feeOn-time69%
DeltaCheapest$602Average$812FlexibilityNo cancel feeOn-timeN/A

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