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$548+ 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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find 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 October 30, 2025.

This United Airlines deal was found by Cheapflights users on 10/29. 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.
Thu 11/275:50 amOTP - ONT
2 stops21h 44mUnited Airlines
Sat 2/76:00 amONT - OTP
2 stops22h 05mUnited Airlines
Deal found 10/29$850
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/131:50 pmBEG - ONT
2 stops18h 01mUnited Airlines
Thu 11/277:00 amONT - BEG
2 stops20h 50mUnited Airlines
Deal found 10/28$891
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1412:50 pmATH - ONT
2 stops33h 04mAmerican Airlines
Tue 11/1810:47 amONT - ATH
2 stops22h 43mAmerican Airlines
Deal found 10/28$895
This United Airlines deal was found by Cheapflights users on 10/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:10 amSOF - ONT
2 stops26h 15mUnited Airlines
Thu 3/267:15 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 10/30$896
This United Airlines deal was found by Cheapflights users on 10/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:10 amSOF - ONT
2 stops21h 27mUnited Airlines
Wed 2/251:45 pmONT - SOF
2 stops18h 35mUnited Airlines
Deal found 10/30$899
This United Airlines deal was found by Cheapflights users on 10/29. 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 12/246:10 amSOF - ONT
2 stops26h 15mUnited Airlines
Tue 3/247:15 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 10/29$901
This Delta deal was found by Cheapflights users on 10/27. 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.
Fri 11/146:05 amBEG - ONT
2 stops25h 59mDelta
Tue 11/187:05 amONT - BEG
2 stops31h 20mDelta
Deal found 10/27$906
This British Airways deal was found by Cheapflights users on 10/29. 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 11/148:20 pmOTP - ONT
2 stops32h 01mBritish Airways
Fri 11/2810:47 amONT - OTP
2 stops26h 38mBritish Airways
Deal found 10/29$907
This United Airlines deal was found by Cheapflights users on 10/29. 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 11/121:50 pmBEG - ONT
2 stops18h 01mUnited Airlines
Wed 12/106:00 amONT - BEG
2 stops21h 50mUnited Airlines
Deal found 10/29$914
This Delta deal was found by Cheapflights users on 10/29. 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.
Fri 11/146:00 amOTP - ONT
2 stops27h 04mDelta
Tue 11/1812:16 pmONT - OTP
2 stops24h 34mDelta
Deal found 10/29$921
This United Airlines deal was found by Cheapflights users on 10/29. 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 11/232:00 pmATH - ONT
2 stops18h 51mUnited Airlines
Wed 2/251:45 pmONT - ATH
2 stops16h 50mUnited Airlines
Deal found 10/29$927
This Delta deal was found by Cheapflights users on 10/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:25 amATH - ONT
2 stops22h 44mDelta
Wed 11/196:00 amONT - ATH
2 stops21h 35mDelta
Deal found 10/30$932

Cheap 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 October 30, 2025.

Round-trip from

$850
(United Airlines)

One-way from

$548
(Gotogate)
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 October 30, 2025.
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

BucharestOntario

OTP - ONT

OTPONT

Bucharest Otopeni Intl

Thu 11/27

5:50 am-5:34 pm

2 stops21h 44m

Ontario

Sat 2/7

6:00 am-2:05 pm

2 stops22h 05m

$850

BucharestOntario

OTP - ONT

OTPONT

Bucharest Otopeni Intl

Mon 4/6

12:40 pm-10:26 pm

2 stops19h 46m

Ontario

Thu 4/16

4:15 pm-6:35 pm

2 stops16h 20m

$863

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Thu 11/13

1:50 pm-10:51 pm

2 stops18h 01m

Ontario

Thu 11/27

7:00 am-12:50 pm

2 stops20h 50m

$891

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 11/14

12:50 pm-11:54 am

2 stops33h 04m

Ontario

Tue 11/18

10:47 am-7:30 pm

2 stops22h 43m

$895

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Thu 3/26

7:15 pm-10:45 pm

2 stops18h 30m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Wed 3/25

7:15 pm-10:45 pm

2 stops18h 30m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Tue 3/24

7:15 pm-10:45 pm

2 stops18h 30m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Mon 3/30

4:15 pm-11:10 pm

2 stops20h 55m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 12/5

6:10 am-5:37 pm

2 stops21h 27m

Ontario

Wed 2/25

1:45 pm-6:20 pm

2 stops18h 35m

$899

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Fri 11/14

6:05 am-11:04 pm

2 stops25h 59m

Ontario

Tue 11/18

7:05 am-11:25 pm

2 stops31h 20m

$906

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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 $366). Flying from Southeast Europe to Ontario in May is currently the most expensive (average of $717). 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 October 30, 2025.
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
8,998 reviews

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
8,998 reviews
United Airlines
7.4
Good
8,998 reviews

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Comfort

7.3

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 21h 44m. Airlines will cover a distance of 6541 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as $548. However, be on the lookout for offers from United Airlines and American Airlines, as they are both options that can get you from Southeast Europe to Ontario for a low price.

  • 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 Sofia - 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 $366). Flying from Southeast Europe to Ontario in May is currently the most expensive (average of $717). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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