HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$422+ 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 7/17. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Jul 1 — Jul 81
Tue 7/1
Tue 7/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Southeast Europe to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 26, 2025.

Round-trip from

$871
(United Airlines)

One-way from

$422
(Trip.com)
From Southeast Europe to Ontario
Search Deals
One-way flight from Southeast Europe to Ontario
Search Deals

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 June 26, 2025.

This United Airlines deal was found by Cheapflights users on 6/24. 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 9/166:20 amSOF - ONT
2 stops21h 17mUnited Airlines
Tue 9/236:50 pmONT - SOF
2 stops18h 10mUnited Airlines
Deal found 6/24$871
This Delta deal was found by Cheapflights users on 6/23. 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 amBEG - ONT
2 stops25h 41mDelta
Tue 11/186:00 amONT - BEG
2 stops32h 10mDelta
Deal found 6/23$874
This KLM deal was found by Cheapflights users on 6/24. 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.
Thu 8/219:10 amATH - ONT
1 stop23h 10mKLM
Fri 9/2610:59 pmONT - ATH
1 stop25h 01mKLM
Deal found 6/24$918
This United Airlines deal was found by Cheapflights users on 6/24. 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 10/66:05 amZAG - ONT
2 stops20h 35mUnited Airlines
Mon 10/209:36 amONT - ZAG
2 stops19h 34mUnited Airlines
Deal found 6/24$935
This American Airlines deal was found by Cheapflights users on 6/24. 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.
Tue 8/58:00 pmATH - ONT
2 stops30h 06mAmerican Airlines
Sat 8/162:57 pmONT - ATH
2 stops23h 58mAmerican Airlines
Deal found 6/24$936
This Delta deal was found by Cheapflights users on 6/23. 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.
Wed 11/263:25 pmZAG - ONT
2 stops37h 17mDelta
Sun 11/306:00 amONT - ZAG
2 stops31h 55mDelta
Deal found 6/23$937
This Lufthansa deal was found by Cheapflights users on 6/25. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/116:00 amATH - ONT
2 stops24h 54mMultiple Airlines
Tue 7/156:39 pmONT - ATH
2 stops18h 21mMultiple Airlines
Deal found 6/25$944
This United Airlines deal was found by Cheapflights users on 6/24. 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 8/86:00 amOTP - ONT
2 stops40h 32mUnited Airlines
Fri 8/156:39 pmONT - OTP
2 stops20h 21mUnited Airlines
Deal found 6/24$950
This British Airways deal was found by Cheapflights users on 6/24. 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 8/85:25 amATH - ONT
2 stops22h 59mBritish Airways
Mon 8/184:54 pmONT - ATH
2 stops21h 56mBritish Airways
Deal found 6/24$968
This United Airlines deal was found by Cheapflights users on 6/24. 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 8/710:25 amATH - ONT
2 stops21h 41mUnited Airlines
Thu 8/217:00 amONT - ATH
1 stop17h 30mUnited Airlines
Deal found 6/24$991
This Delta deal was found by Cheapflights users on 6/24. 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 8/79:10 amATH - ONT
1 stop23h 17mDelta
Mon 8/1811:45 amONT - ATH
2 stops22h 15mDelta
Deal found 6/24$1,018
This Air France deal was found by Cheapflights users on 6/24. 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.
Fri 11/147:00 amSOF - ONT
2 stops25h 41mAir France
Tue 11/1812:00 pmONT - SOF
2 stops40h 05mAir France
Deal found 6/24$1,034

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 June 26, 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

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 9/16

6:20 am-5:37 pm

2 stops21h 17m

Ontario

Tue 9/23

6:50 pm-11:00 pm

2 stops18h 10m

$871

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Fri 11/14

6:00 am-10:41 pm

2 stops25h 41m

Ontario

Tue 11/18

6:00 am-11:10 pm

2 stops32h 10m

$874

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 8/21

9:10 am-10:20 pm

1 stop23h 10m

Ontario

Fri 9/26

10:59 pm-10:00 am

1 stop25h 01m

$918

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Mon 10/6

6:05 am-5:40 pm

2 stops20h 35m

Ontario

Mon 10/20

9:36 am-2:10 pm

2 stops19h 34m

$935

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 8/5

8:00 pm-4:06 pm

2 stops30h 06m

Ontario

Sat 8/16

2:57 pm-12:55 am

2 stops23h 58m

$936

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Wed 11/26

3:25 pm-7:42 pm

2 stops37h 17m

Ontario

Sun 11/30

6:00 am-10:55 pm

2 stops31h 55m

$937

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 7/11

6:00 am-8:54 pm

2 stops24h 54m

Ontario

Tue 7/15

6:39 pm-11:00 pm

2 stops18h 21m

$944

BucharestOntario

OTP - ONT

OTPONT

Bucharest Otopeni Intl

Fri 8/8

6:00 am-12:32 pm

2 stops40h 32m

Ontario

Fri 8/15

6:39 pm-1:00 am

2 stops20h 21m

$950

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 8/8

5:25 am-6:24 pm

2 stops22h 59m

Ontario

Mon 8/18

4:54 pm-12:50 am

2 stops21h 56m

$968

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 8/7

10:25 am-10:06 pm

2 stops21h 41m

Ontario

Thu 8/21

7:00 am-10:30 am

1 stop17h 30m

$991

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/24

Showing 1-10 of 60 results
1
2
3
...
6

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, August is the cheapest month in which you can book a flight from Southeast Europe to Ontario (average of $246). Flying from Southeast Europe to Ontario in March is currently the most expensive (average of $328). 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 Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 26, 2025.
Read reviews from past customers who have flown Delta, KLM, and Air France 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.
Delta
8.0
Very good
7,964 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,964 reviews
Delta
8.0
Very good
7,964 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,365 reviews
Delta
8.0
Very good
7,964 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.5
Good
1,470 reviews
Delta
8.0
Very good
7,964 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Qatar Airways
7.4
Good
3,595 reviews
Delta
8.0
Very good
7,964 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Etihad Airways
7.4
Good
1,221 reviews
Delta
8.0
Very good
7,964 reviews

Boarding

8.2

Overall

8.0

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    The cheapest airline one-way is Air Serbia, with whom users have recently found tickets for as low as $646. However, be on the lookout for offers from Lufthansa and United 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, August is the cheapest month in which you can book a flight from Southeast Europe to Ontario (average of $246). Flying from Southeast Europe to Ontario in March is currently the most expensive (average of $328). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Southeast Europe to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Frankfurt to San Francisco flights
Heathrow to Los Angeles flights
Charles de Gaulle to Los Angeles flights
Frankfurt to Los Angeles flights
Orly to Los Angeles flights
Charles de Gaulle to San Francisco flights
Frankfurt to Las Vegas flights
Heathrow to San Francisco flights
Madrid to Los Angeles flights
Heathrow to Las Vegas flights
Frederic Chopin to Los Angeles flights
Frankfurt to San Jose flights
London City to Los Angeles flights
Barcelona-El Prat to Los Angeles flights
Orly to San Francisco flights
Malpensa to Los Angeles flights
Gatwick to Los Angeles flights
Amsterdam to Los Angeles flights
Frankfurt to Ontario flights
Vienna to Los Angeles flights
Munich to San Francisco flights
Duesseldorf Intl to Los Angeles flights
Charles de Gaulle to Las Vegas flights
Leonardo da Vinci/Fiumicino to Los Angeles flights
Frankfurt to Santa Ana flights
Frankfurt to Long Beach flights
Linate to Los Angeles flights
Munich to Los Angeles flights
Zurich to Los Angeles flights
Orly to Las Vegas flights
Charles de Gaulle to Long Beach flights
Luton to Los Angeles flights
Gatwick to San Francisco flights
Amsterdam to San Francisco flights
Leonardo da Vinci/Fiumicino to San Francisco flights
Heathrow to San Diego flights
Zurich to San Francisco flights
London City to San Francisco flights
Frankfurt-Hahn to Los Angeles flights
Heathrow to Ontario flights
Barcelona-El Prat to San Francisco flights
Beauvais-Tille to Los Angeles flights
Gatwick to Las Vegas flights

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 June 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.