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 $638. However, be on the lookout for offers from Qatar Airways and Lufthansa, 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.

How far in advance should I book a flight from Southeast Europe to Ontario?

To save on the cost of your flight from Southeast Europe to Ontario, book at least 39 days before your planned departure. Booking around this time can save you about 19% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $855 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,041.

What is the cheapest month to fly from Southeast Europe to Ontario?

The best pricing can be found in the month of March. Prices to Ontario from Southeast Europe average $900. You can even find prices in March for less than $900, as users have found deals to Ontario from as low as $707. The month of December appears to be one of the more expensive times to travel to Ontario from Southeast Europe. Flying in the targeted month can save you up to 14%.

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

When flying from Southeast Europe to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

$638+ Flights from Southeast Europe to Ontario - Compare & Save Big

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Cheap flight deals from Southeast Europe to Ontario

Round-trip from	$852 (United Airlines)
One-way from	$638 (Air Serbia)

From Southeast Europe to Ontario

Search Deals

One-way flight from Southeast Europe to Ontario

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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 May 1, 2025.

Wed 11/127:55 pmATH - ONT

2 stops35h 46mBritish Airways

Thu 11/273:05 pmONT - ATH

2 stops24h 10mBritish Airways

Deal found 4/30

$842

Mon 9/16:10 amBEG - ONT

2 stops23h 23mUnited Airlines

Mon 9/156:04 amONT - BEG

2 stops21h 31mUnited Airlines

Deal found 4/29

$852

Fri 8/2912:35 pmBEG - ONT

2 stops20h 08mDelta

Fri 9/125:05 pmONT - BEG

2 stops20h 50mDelta

Deal found 4/29

$870

Thu 5/151:40 pmATH - ONT

2 stops31h 28mDelta

Mon 5/192:55 pmONT - ATH

2 stops22h 20mDelta

Deal found 4/29

$874

Fri 10/176:05 amZAG - ONT

2 stops24h 51mUnited Airlines

Sat 11/17:00 amONT - ZAG

2 stops31h 15mUnited Airlines

Deal found 4/29

$919

Thu 5/296:55 amATH - ONT

2 stops25h 50mUnited Airlines

Thu 6/55:10 amONT - ATH

2 stops24h 25mUnited Airlines

Deal found 4/29

$983

Sat 6/286:00 amZAG - ONT

2 stops25h 46mDelta

Sun 7/61:15 pmONT - ZAG

2 stops24h 30mDelta

Deal found 4/29

$993

Tue 9/27:50 amBEG - ONT

1 stop23h 40mAir Serbia

Mon 9/1511:00 pmONT - BEG

1 stop20h 40mAir Serbia

Deal found 4/29

$1,007

Tue 8/1912:10 pmATH - ONT

1 stop20h 19mKLM

Sun 8/317:00 amONT - ATH

1 stop17h 00mKLM

Deal found 4/29

$1,050

Fri 9/268:25 amOTP - ONT

2 stops19h 26mBritish Airways

Sat 10/45:09 pmONT - OTP

2 stops21h 21mBritish Airways

Deal found 4/30

$1,060

Tue 9/165:55 pmZAG - ONT

2 stops37h 01mMultiple Airlines

Sat 9/2011:59 pmONT - ZAG

2 stops38h 06mMultiple Airlines

Deal found 4/29

$1,097

Thu 5/2212:00 pmSOF - ONT

2 stops20h 45mUnited Airlines

Wed 6/41:36 pmONT - SOF

2 stops23h 14mUnited Airlines

Deal found 5/1

$1,159

Best flights from Southeast Europe to Ontario
Discover carefully curated flight deals from Southeast Europe to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 2025.

Mon 9/16:10 amBEG - ONT

2 stops23h 23mUnited Airlines

Mon 9/156:04 amONT - BEG

2 stops21h 31mUnited Airlines

Deal found 4/29

$852

Fri 8/2912:35 pmBEG - ONT

2 stops20h 08mDelta

Fri 9/125:05 pmONT - BEG

2 stops20h 50mDelta

Deal found 4/29

$870

Tue 9/166:55 amATH - ONT

2 stops20h 56mBritish Airways

Thu 9/253:00 pmONT - ATH

2 stops23h 55mBritish Airways

Deal found 4/30

$871

Tue 9/27:50 amBEG - ONT

1 stop23h 40mAir Serbia

Tue 9/1611:00 pmONT - BEG

1 stop20h 40mAir Serbia

Deal found 4/29

$1,007

Tue 8/1912:10 pmATH - ONT

1 stop20h 19mKLM

Sun 8/317:00 amONT - ATH

1 stop17h 00mKLM

Deal found 4/29

$1,050

Tue 9/165:55 pmZAG - ONT

2 stops37h 01mMultiple Airlines

Sat 9/2011:59 pmONT - ZAG

2 stops38h 06mMultiple Airlines

Deal found 4/29

$1,097

Sun 5/188:00 pmATH - ONT

2 stops32h 25mQatar Airways

Fri 10/311:39 amONT - ATH

2 stops33h 21mQatar Airways

Deal found 4/29

$1,383

Thu 5/151:40 pmATH - ONT

2 stops31h 28mDelta

Mon 5/192:55 pmONT - ATH

2 stops22h 20mDelta

Deal found 4/29

$874

Fri 10/176:05 amZAG - ONT

2 stops24h 51mUnited Airlines

Sat 11/17:00 amONT - ZAG

2 stops31h 15mUnited Airlines

Deal found 4/29

$919

Fri 9/268:25 amOTP - ONT

2 stops19h 26mBritish Airways

Sat 10/45:09 pmONT - OTP

2 stops21h 21mBritish Airways

Deal found 4/30

$1,060

Thu 5/296:55 amATH - ONT

2 stops25h 50mUnited Airlines

Thu 6/55:10 amONT - ATH

2 stops24h 25mUnited Airlines

Deal found 4/29

$983

Sat 6/286:00 amZAG - ONT

2 stops25h 46mDelta

Sun 7/61:15 pmONT - ZAG

2 stops24h 30mDelta

Deal found 4/29

$993

Last-minute flights from Southeast Europe to Ontario
Discover last-minute flight deals from Southeast Europe to Ontario. Data last updated May 1, 2025 and is based on user searches.

Thu 5/85:10 pmOTP - ONT

2 stops34h 20mQatar Airways

Sat 5/242:44 pmONT - OTP

2 stops37h 31mQatar Airways

Deal found 4/30

$2,598

Sat 5/1010:30 amATH - ONT

1 stop22h 38mDelta

Mon 5/267:05 amONT - ATH

1 stop17h 50mDelta

Deal found 4/30

$1,008

Sat 5/108:00 pmATH - ONT

2 stops27h 52mQatar Airways

Mon 5/262:44 pmONT - ATH

2 stops30h 16mQatar Airways

Deal found 4/30

$3,847

Sun 5/116:10 amBEG - ONT

2 stops23h 43mUnited Airlines

Sat 6/76:34 pmONT - BEG

2 stops33h 36mUnited Airlines

Deal found 4/30

$939

Mon 5/127:50 amBEG - ONT

1 stop22h 21mAir Serbia

Tue 6/1010:55 pmONT - BEG

1 stop20h 45mAir Serbia

Deal found 4/30

$1,413

Mon 5/123:00 pmZAG - ONT

2 stops39h 11mAir Serbia

Mon 6/210:59 pmONT - ZAG

2 stops35h 16mAir Serbia

Deal found 4/30

$1,498

Thu 5/151:40 pmATH - ONT

2 stops31h 28mDelta

Mon 5/192:55 pmONT - ATH

2 stops22h 20mDelta

Deal found 4/29

$874

Thu 5/1510:30 amATH - ONT

1 stop21h 59mMultiple Airlines

Mon 5/197:05 amONT - ATH

1 stop17h 50mMultiple Airlines

Deal found 4/29

$1,173

Sun 5/189:10 amATH - ONT

1 stop20h 23mKLM

Fri 10/310:59 pmONT - ATH

1 stop25h 01mKLM

Deal found 4/29

$1,064

Sun 5/186:20 amATH - ONT

2 stops25h 37mBritish Airways

Mon 6/211:59 pmONT - ATH

2 stops33h 11mBritish Airways

Deal found 4/28

$1,196

Sun 5/188:00 pmATH - ONT

2 stops32h 25mQatar Airways

Fri 10/311:39 amONT - ATH

2 stops33h 21mQatar Airways

Deal found 4/29

$1,383

Thu 5/2212:00 pmSOF - ONT

2 stops20h 45mUnited Airlines

Wed 6/41:36 pmONT - SOF

2 stops23h 14mUnited Airlines

Deal found 5/1

$1,159

One-way flights from Southeast Europe to Ontario
Search for one-way flight options from Southeast Europe to Ontario. Find affordable one-way fares based on user searches. Data last updated May 1, 2025.

Mon 5/267:50 amBEG - ONT

1 stop22h 21mAir Serbia

Deal found 4/30

$638

Sun 9/213:20 pmDBV - ONT

2 stops39h 21mAir Serbia

Deal found 4/29

$675

Wed 7/27:55 amATH - ONT

2 stops49h 55mMultiple Airlines

Deal found 4/29

$682

Sun 9/213:00 pmZAG - ONT

2 stops39h 41mAir Serbia

Deal found 4/29

$688

Tue 6/34:25 pmATH - ONT

2 stops38h 46mAir Serbia

Deal found 4/29

$700

Sun 5/188:00 pmATH - ONT

2 stops32h 25mQatar Airways

Deal found 4/29

$734

Mon 6/305:00 amSOF - ONT

2 stops26h 59mAir Serbia

Deal found 5/1

$792

Sat 5/246:05 amBEG - ONT

2 stops24h 05mLufthansa

Deal found 4/30

$800

Thu 6/191:00 pmATH - ONT

2 stops32h 59mAmerican Airlines

Deal found 4/28

$808

Mon 8/1810:15 amDBV - ONT

2 stops22h 53mMultiple Airlines

Deal found 4/30

$811

Thu 6/127:55 amATH - ONT

2 stops21h 06mBritish Airways

Deal found 4/29

$813

Sat 6/146:10 amBEG - ONT

2 stops25h 35mUnited Airlines

Deal found 4/30

$814

Cheapflights Fare Finder

Use the filters below to find and compare flights from Southeast Europe to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Mon 9/1

6:10 am-8:33 pm

2 stops23h 23m

Ontario

Mon 9/15

6:04 am-12:35 pm

2 stops21h 31m

$852

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Fri 8/29

12:35 pm-11:43 pm

2 stops20h 08m

Ontario

Tue 9/16

7:00 am-11:55 am

2 stops19h 55m

$870

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 9/16

6:55 am-5:51 pm

2 stops20h 56m

Ontario

Thu 9/25

3:00 pm-12:55 am

2 stops23h 55m

$871

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 5/15

1:40 pm-11:08 am

2 stops31h 28m

Ontario

Mon 5/19

2:55 pm-11:15 pm

2 stops22h 20m

$874

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Fri 10/17

6:05 am-9:56 pm

2 stops24h 51m

Ontario

Sat 11/1

7:00 am-10:15 pm

2 stops31h 15m

$919

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 5/29

6:55 am-10:45 pm

2 stops25h 50m

Ontario

Thu 6/5

5:10 am-3:35 pm

2 stops24h 25m

$983

ZagrebOntario

ZAG - ONT

ZAGONT

Zagreb Franjo Tuđman

Sat 6/28

6:00 am-10:46 pm

2 stops25h 46m

Ontario

Sun 7/6

1:15 pm-10:45 pm

2 stops24h 30m

$993

BelgradeOntario

BEG - ONT

BEGONT

Belgrade Nikola Tesla

Tue 9/2

7:50 am-10:30 pm

1 stop23h 40m

Ontario

Tue 9/16

11:00 pm-4:40 am

1 stop20h 40m

$1,007

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 8/19

12:10 pm-10:29 pm

1 stop20h 19m

Ontario

Sun 8/31

7:00 am-10:00 am

1 stop17h 00m

$1,050

BucharestOntario

OTP - ONT

OTPONT

Bucharest Otopeni Intl

Fri 9/26

8:25 am-5:51 pm

2 stops19h 26m

Ontario

Sat 10/4

5:09 pm-12:30 am

2 stops21h 21m

$1,060

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 53 results

...

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

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

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

Peruse reviews from past customers who have flown with Delta, KLM and Qatar Airways from Southeast Europe to Ontario to help guide your decision. 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

7,934 reviews

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

7,934 reviews

Delta

8.0

Very good

7,934 reviews

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

1,334 reviews

Delta

8.0

Very good

7,934 reviews

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

3,563 reviews

Delta

8.0

Very good

7,934 reviews

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

1,203 reviews

Delta

8.0

Very good

7,934 reviews

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

7.4

Good

1,446 reviews

Delta

8.0

Very good

7,934 reviews

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

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 $638. However, be on the lookout for offers from Qatar Airways and Lufthansa, 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

Top airline flying from Southeast Europe to Ontario

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$913	Average$1,037	FlexibilityNo cancel fee	On-time69%

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$638+ 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.

Find cheap flights from Southeast Europe to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 May 1, 2025.

Round-trip from

One-way from

Find flight deals from Southeast Europe to Ontario

Cheapest flights from Southeast Europe to OntarioExplore 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 May 1, 2025.

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 May 1, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Southeast Europe to Ontario that are best for you.

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.

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?

Rainfall in Ontario by month

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

Temperature in Ontario by month

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

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 May 1, 2025.

Peruse reviews from past customers who have flown with Delta, KLM and Qatar Airways from Southeast Europe to Ontario to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

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

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

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

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.

Top airline flying from Southeast Europe to Ontario

100% Free

Book with Flexibility

Travel Smart

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 May 1, 2025.