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Greece

$384+ Cheap flights from Ontario (ONT) to Greece

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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Ontario to Greece

Keep the following information in mind while searching for Ontario to Greece flight deals. Data was last updated September 17, 2025.

Round-trip from

$471
(American Airlines)

One-way from

$384
(Finnair)

Popular in

June

Cheapest in

February

Average price

$707
From Ontario to Greece
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One-way flight from Ontario to Greece
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Highest demand for flights based on searches. 19% potential increase in price ($186 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Greece

Cheapest flights from Ontario to Greece
Explore the most affordable flight options available from Ontario to Greece. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/36:20 amONT - ATH
2 stops18h 40mAmerican Airlines
Wed 12/37:50 amATH - ONT
2 stops21h 49mAmerican Airlines
Deal found 9/17$471
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/3010:57 amONT - ATH
2 stops22h 53mAmerican Airlines
Thu 11/67:30 amATH - ONT
2 stops23h 41mAmerican Airlines
Deal found 9/15$530
This Tripair deal was found by Cheapflights users on 9/14. 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.
Mon 11/36:38 pmONT - ATH
2 stops44h 17mUnited Airlines
Wed 11/1911:55 amATH - ONT
2 stops34h 42mUnited Airlines
Deal found 9/14$535
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 11/196:00 amONT - ATH
2 stops19h 35mUnited Airlines
Tue 12/27:05 amATH - ONT
2 stops25h 44mUnited Airlines
Deal found 9/16$555
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/96:00 amONT - ATH
2 stops19h 35mUnited Airlines
Sun 11/232:00 pmATH - ONT
2 stops18h 51mUnited Airlines
Deal found 9/17$559
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/246:04 amONT - ATH
2 stops21h 56mUnited Airlines
Tue 10/287:05 amATH - ONT
2 stops24h 46mUnited Airlines
Deal found 9/17$573
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:59 pmONT - ATH
2 stops30h 36mUnited Airlines
Wed 3/42:20 pmATH - ONT
2 stops18h 37mUnited Airlines
Deal found 9/15$576
This British Airways deal was found by Cheapflights users on 9/14. 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.
Wed 9/244:45 pmONT - ATH
2 stops22h 05mBritish Airways
Mon 10/207:30 pmATH - ONT
2 stops30h 58mBritish Airways
Deal found 9/14$577
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/56:00 amONT - ATH
2 stops19h 35mUnited Airlines
Wed 11/122:20 pmATH - ONT
2 stops18h 31mUnited Airlines
Deal found 9/17$609
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/207:00 amONT - ATH
2 stops17h 20mUnited Airlines
Fri 11/2812:50 pmATH - ONT
2 stops20h 01mUnited Airlines
Deal found 9/15$620
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 10/237:05 amONT - ATH
1 stop17h 50mDelta
Tue 10/281:45 pmATH - ONT
2 stops35h 08mDelta
Deal found 9/15$631
This KLM deal was found by Cheapflights users on 9/16. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/297:05 amONT - SKG
2 stops20h 25mKLM
Fri 10/311:40 pmSKG - ONT
2 stops29h 46mKLM
Deal found 9/16$660

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Greece 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 September 17, 2025.
Use the filters below to find and compare flights from Ontario to Greece that are best for you.

Fly from

Ontario

Fly to

Greece

Route

Depart

Return

Price

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 2/13

3:05 pm-9:55 pm

2 stops20h 50m

Athens Eleftherios V.

Fri 2/27

7:45 am-9:57 pm

2 stops24h 12m

$522

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 10/30

10:57 am-6:50 pm

2 stops22h 53m

Athens Eleftherios V.

Thu 11/6

7:30 am-9:11 pm

2 stops23h 41m

$530

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 11/9

6:00 am-11:35 am

2 stops19h 35m

Athens Eleftherios V.

Sun 11/23

2:00 pm-10:51 pm

2 stops18h 51m

$559

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 12/30

11:59 pm-4:35 pm

2 stops30h 36m

Athens Eleftherios V.

Wed 3/4

2:20 pm-10:57 pm

2 stops18h 37m

$576

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 2/16

5:40 am-4:35 pm

2 stops24h 55m

Athens Eleftherios V.

Wed 2/25

2:20 pm-10:57 pm

2 stops18h 37m

$576

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 11/3

7:00 am-6:00 pm

2 stops25h 00m

Athens Eleftherios V.

Tue 11/11

12:25 pm-9:49 pm

2 stops43h 24m

$576

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 2/17

5:40 am-4:35 pm

2 stops24h 55m

Athens Eleftherios V.

Tue 2/24

2:10 pm-10:57 pm

2 stops18h 47m

$576

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 11/2

7:00 am-6:00 pm

2 stops25h 00m

Athens Eleftherios V.

Tue 11/11

12:25 pm-9:49 pm

2 stops43h 24m

$576

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 2/17

5:40 am-4:35 pm

2 stops24h 55m

Athens Eleftherios V.

Wed 2/25

2:20 pm-10:57 pm

2 stops18h 37m

$576

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 2/16

5:40 am-4:35 pm

2 stops24h 55m

Athens Eleftherios V.

Tue 2/24

2:10 pm-10:57 pm

2 stops18h 47m

$576

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 33 results
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Best time to book a flight from Ontario to Greece

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

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

Currently, November is the cheapest month in which you can book a flight from Ontario to Greece (average of $679). Flying from Ontario to Greece in June is currently the most expensive (average of $1,282). 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.

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

Find hourly flight availability from Ontario to Greece. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Greece as you normally would.

Reviews of airlines servicing Greece

Get insights into the airlines that provide service to Greece. 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 Greece. Reviews last updated September 17, 2025.
Read reviews from past customers who have flown Delta and United Airlines from Ontario to Greece. 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
7,961 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Greece. 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 from for flights from Ontario to Greece?

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

  • How long is the flight from Ontario to Greece?

    A quick flight from Ontario to Greece can take about 19h 35m. British Airways provides one of the quickest options available for as low as $559. The distance from Ontario to Greece is about 6879 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $385 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on United Airlines and KLM, with prices starting from $389 and $637, respectively.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from Ontario to Greece (average of $679). Flying from Ontario to Greece in June is currently the most expensive (average of $1,282). 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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Top 2 airlines flying from Ontario to Greece

Discover the top 2 airlines that operate flights from Ontario to Greece. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$955FlexibilityNo cancel feeOn-time69%
DeltaCheapest$602Average$812FlexibilityNo cancel feeOn-timeN/A

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