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Ontario

$709+ Cheap flights from Greece 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 6/23. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
1 adult, Economy
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Cheap flight deals from Greece to Ontario

Keep the following information in mind while searching for Greece to Ontario flight deals. Data was last updated June 18, 2025.

Round-trip from

$827
(KLM)

One-way from

$709
(Air Serbia)

Popular in

December

Cheapest in

June

Average price

$779
From Greece to Ontario
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One-way flight from Greece to Ontario
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Highest demand for flights based on searches. 1% potential increase in price ($8 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Greece to Ontario

Cheapest flights from Greece to Ontario
Explore the most affordable flight options available from Greece to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 18, 2025.

This KLM deal was found by Cheapflights users on 6/15. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/289:10 amATH - ONT
1 stop20h 01mKLM
Sat 9/277:00 amONT - ATH
1 stop17h 55mKLM
Deal found 6/15$828
This Tripair deal was found by Cheapflights users on 6/16. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/147:55 pmATH - ONT
2 stops35h 42mBritish Airways
Sat 12/275:03 pmONT - ATH
2 stops34h 17mBritish Airways
Deal found 6/16$853
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2412:10 pmATH - ONT
2 stops19h 56mUnited Airlines
Thu 8/75:05 amONT - ATH
2 stops19h 00mUnited Airlines
Deal found 6/16$898
This American Airlines deal was found by Cheapflights users on 6/15. 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.
Wed 8/1312:00 pmATH - ONT
1 stop19h 10mAmerican Airlines
Fri 1/96:37 amONT - ATH
2 stops29h 18mAmerican Airlines
Deal found 6/15$929
This Delta deal was found by Cheapflights users on 6/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/306:00 amATH - ONT
2 stops27h 42mDelta
Wed 8/610:05 pmONT - ATH
1 stop26h 50mDelta
Deal found 6/15$954
This Air Canada deal was found by Cheapflights users on 6/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/161:10 pmATH - ONT
2 stops33h 04mMultiple Airlines
Wed 8/65:05 amONT - ATH
3 stops22h 55mMultiple Airlines
Deal found 6/15$985
This Iberia deal was found by Cheapflights users on 6/17. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/44:10 amATH - ONT
2 stops29h 44mIberia
Sat 8/2310:50 amONT - ATH
2 stops30h 40mIberia
Deal found 6/17$1,149
This Air Serbia deal was found by Cheapflights users on 6/15. 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 Air Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/264:20 amATH - ONT
2 stops28h 10mAir Serbia
Tue 9/910:56 pmONT - ATH
2 stops42h 29mAir Serbia
Deal found 6/15$1,168
This Air Canada deal was found by Cheapflights users on 6/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/144:00 pmATH - ONT
3 stops30h 32mAir Canada
Sat 8/166:31 pmONT - ATH
3 stops32h 29mAir Canada
Deal found 6/15$1,890
This Qatar Airways deal was found by Cheapflights users on 6/15. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:00 pmATH - ONT
2 stops32h 30mQatar Airways
Sun 11/23:05 pmONT - ATH
2 stops34h 45mQatar Airways
Deal found 6/15$2,166

Cheapflights Fare Finder

Customize your flight search to find flights from Greece 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 18, 2025.
Use the filters below to find and compare flights from Greece to Ontario that are best for you.

Fly from

Greece

Fly to

Ontario

Route

Depart

Return

Price

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 8/28

9:10 am-7:11 pm

1 stop20h 01m

Ontario

Sat 9/27

7:00 am-10:55 am

1 stop17h 55m

$828

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 7/24

12:10 pm-10:06 pm

2 stops19h 56m

Ontario

Thu 8/7

5:05 am-10:05 am

2 stops19h 00m

$898

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 8/13

12:00 pm-9:10 pm

1 stop19h 10m

Ontario

Sun 1/11

10:57 am-6:35 pm

2 stops21h 38m

$929

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 7/30

6:00 am-11:42 pm

2 stops27h 42m

Ontario

Wed 8/6

10:05 pm-10:55 am

1 stop26h 50m

$954

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 7/16

1:10 pm-12:14 pm

2 stops33h 04m

Ontario

Wed 8/6

5:05 am-2:00 pm

3 stops22h 55m

$985

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 8/12

8:00 pm-5:52 pm

2 stops31h 52m

Ontario

Fri 1/9

5:03 pm-9:55 pm

2 stops18h 52m

$1,100

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 8/4

4:10 am-11:54 pm

2 stops29h 44m

Ontario

Sat 8/23

10:50 am-3:30 am

2 stops30h 40m

$1,149

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 8/26

4:20 am-10:30 pm

2 stops28h 10m

Ontario

Tue 9/9

10:56 pm-3:25 am

2 stops42h 29m

$1,168

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 8/14

4:00 pm-12:32 pm

3 stops30h 32m

Ontario

Sat 8/16

6:31 pm-1:00 pm

3 stops32h 29m

$1,890

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sat 8/30

8:00 pm-1:41 pm

2 stops27h 41m

Ontario

Sun 9/28

2:30 pm-7:00 am

2 stops30h 30m

$2,523

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 20 results
1
2

Best time to book a flight from Greece to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from Greece to Ontario (average of $246). Flying from Greece 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 18, 2025.
See what other customers who have flown with Delta, KLM and Air France from Greece to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,964 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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
1,364 reviews
Delta
8.0
Very good
7,964 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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
1,467 reviews
Delta
8.0
Very good
7,964 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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
3,591 reviews
Delta
8.0
Very good
7,964 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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
1,212 reviews
Delta
8.0
Very good
7,964 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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 Greece 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 Greece?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Greece. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

    The cheapest airlines for a one-way flight from Greece to Ontario are Air Serbia ($709), American Airlines ($823), and British Airways ($826).

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

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

  • How can I find direct flights from Greece to Ontario?

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

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

    Yes. Cheapflights offers flight deals from Greece 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 Greece to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Greece to Ontario (average of $246). Flying from Greece 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

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Alternative routes for Greece 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 Greece to Ontario

Discover the top airline that operate flights from Greece 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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