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$601+ Cheap flights from Southeast Europe to Ontario (ONT)

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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
1 adult, Economy
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Cheap flight deals from Southeast Europe to Ontario

Cheapest flights from Southeast Europe to Ontario
Explore the most affordable flight options available from Southeast Europe to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.

This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:30 am
ZAG
-
ONT
2 stops22h 30m
Delta
Sun 4/55:09 pm
ONT
-
ZAG
2 stops20h 31m
Delta
Deal found 2/9$840
This United Airlines deal was found by Cheapflights users on 2/9. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/76:20 am
BEG
-
ONT
2 stops20h 42m
United Airlines
Tue 4/217:00 am
ONT
-
BEG
2 stops31h 35m
United Airlines
Deal found 2/9$922
This United Airlines deal was found by Cheapflights users on 2/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:10 am
BEG
-
ONT
2 stops20h 37m
United Airlines
Sat 8/297:00 am
ONT
-
BEG
2 stops20h 45m
United Airlines
Deal found 2/10$928
This United Airlines deal was found by Cheapflights users on 2/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:25 pm
SOF
-
ONT
2 stops18h 32m
United Airlines
Mon 4/61:27 pm
ONT
-
SOF
2 stops23h 13m
United Airlines
Deal found 2/12$944
This United Airlines deal was found by Cheapflights users on 2/9. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:10 am
BEG
-
ONT
2 stops23h 26m
United Airlines
Wed 4/157:00 am
ONT
-
BEG
2 stops20h 45m
United Airlines
Deal found 2/9$952
This United Airlines deal was found by Cheapflights users on 2/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/232:20 pm
SOF
-
ONT
2 stops18h 37m
United Airlines
Thu 4/91:34 pm
ONT
-
SOF
2 stops18h 51m
United Airlines
Deal found 2/12$954
This KLM deal was found by Cheapflights users on 2/12. 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 2/288:35 am
OTP
-
ONT
2 stops22h 30m
Multiple Airlines
Wed 3/46:00 am
ONT
-
OTP
2 stops28h 10m
Multiple Airlines
Deal found 2/12$954
This United Airlines deal was found by Cheapflights users on 2/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/156:15 am
BEG
-
ONT
2 stops25h 51m
United Airlines
Sun 1/35:00 am
ONT
-
BEG
2 stops33h 50m
United Airlines
Deal found 2/12$957
This United Airlines deal was found by Cheapflights users on 2/9. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:45 am
ATH
-
ONT
2 stops21h 02m
United Airlines
Tue 4/217:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 2/9$959
This United Airlines deal was found by Cheapflights users on 2/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:05 am
ATH
-
ONT
2 stops24h 02m
United Airlines
Tue 5/57:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 2/10$964
This United Airlines deal was found by Cheapflights users on 2/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/72:50 pm
OTP
-
ONT
2 stops18h 07m
United Airlines
Sun 3/156:15 am
ONT
-
OTP
2 stops22h 50m
United Airlines
Deal found 2/10$964
This United Airlines deal was found by Cheapflights users on 2/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/16:15 am
ATH
-
ONT
2 stops21h 26m
United Airlines
Sun 3/225:15 am
ONT
-
ATH
2 stops18h 50m
United Airlines
Deal found 2/12$965

Find flight deals from Southeast Europe to Ontario

Keep the following information in mind while searching for Southeast Europe to Ontario flight deals. Data was last updated February 12, 2026.

Round-trip from

$840
(Delta)

One-way from

$601
(Cheapflightsfares)
From Southeast Europe to Ontario
Search Deals
One-way flight from Southeast Europe to Ontario
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Southeast Europe to Ontario 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 February 12, 2026.
Use the filters below to find and compare flights from Southeast Europe to Ontario that are best for you.

Fly from

Southeast Europe

Fly to

Ontario

Route

Depart

Return

Price

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Fri 3/13

6:30 am-5:12 pm

2 stops18h 42m

Ontario

Sat 4/4

11:59 am-4:10 pm

2 stops19h 11m

$840

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Thu 3/12

6:30 am-9:00 pm

2 stops22h 30m

Ontario

Sat 4/4

11:59 am-4:10 pm

2 stops19h 11m

$840

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Thu 3/12

6:30 am-9:00 pm

2 stops22h 30m

Ontario

Sun 4/5

5:09 pm-10:40 pm

2 stops20h 31m

$840

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Fri 3/13

6:30 am-10:33 pm

2 stops24h 03m

Ontario

Sun 4/5

5:09 pm-10:40 pm

2 stops20h 31m

$840

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Tue 4/7

6:20 am-6:02 pm

2 stops20h 42m

Ontario

Tue 4/21

7:00 am-12:25 pm

2 stops20h 25m

$926

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 2/25

2:25 pm-10:57 pm

2 stops18h 32m

Ontario

Mon 4/6

1:27 pm-10:40 pm

2 stops23h 13m

$944

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Wed 4/1

6:10 am-8:36 pm

2 stops23h 26m

Ontario

Wed 4/15

7:00 am-12:45 pm

2 stops20h 45m

$952

BucharestOntario

OTP - ONT

OTPONT

Bucharest Otopeni Intl

Sat 2/28

8:35 am-9:05 pm

2 stops22h 30m

Ontario

Wed 3/4

6:00 am-8:10 pm

2 stops28h 10m

$954

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 2/23

2:20 pm-10:57 pm

2 stops18h 37m

Ontario

Thu 4/9

1:34 pm-6:25 pm

2 stops18h 51m

$954

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 2/25

2:25 pm-10:57 pm

2 stops18h 32m

Ontario

Thu 4/9

1:34 pm-6:25 pm

2 stops18h 51m

$954

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

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

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

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

Currently, June is the cheapest month in which you can book a flight from Southeast Europe to Ontario (average of $326). Flying from Southeast Europe to Ontario in January is currently the most expensive (average of $736). 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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated February 12, 2026.
Read reviews from past customers who have flown United Airlines from Southeast Europe to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,283 reviews

Entertainment

7.1

Food

6.6

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,283 reviews
United Airlines
7.4
Good
9,283 reviews

Entertainment

7.1

Food

6.6

Crew

8.1

Comfort

7.3

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from Southeast Europe to Ontario. 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 into for flights to Ontario from Southeast Europe?

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

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

    Departing from Southeast Europe to Ontario will take you 18h 42m. Airlines will cover a distance of 6207 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

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

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

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

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

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

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

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

    Currently, June is the cheapest month in which you can book a flight from Southeast Europe to Ontario (average of $326). Flying from Southeast Europe to Ontario in January is currently the most expensive (average of $736). 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 Southeast Europe to Ontario

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

Discover the top airline that operate flights from Southeast Europe to Ontario. 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 February 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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