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$286+ 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 2/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
dic. 20 — dic. 271
sáb. 12/20
sáb. 12/27
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 noviembre 20, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$496
(oojo)

One-way from

$286
(Iberia)

Popular in

June

Cheapest in

February

Average price

$634
Provider with most accurate pricing for Los Angeles-Athens Eleftherios V. flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Athens Eleftherios V. flights.
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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 ($187 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 November 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 noviembre 20, 2025.

This United Airlines deal was found by Cheapflights users on 11/19. 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.
mié. 11/261:29 pmONT - ATH
2 stops17h 06mUnited Airlines
mar. 12/1612:50 pmATH - ONT
2 stops19h 59mUnited Airlines
Deal found 11/19$627
This United Airlines deal was found by Cheapflights users on 11/20. 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.
dom. 11/309:35 pmONT - ATH
2 stops33h 00mUnited Airlines
mar. 12/166:25 amATH - ONT
2 stops24h 17mUnited Airlines
Deal found 11/20$630
This KLM deal was found by Cheapflights users on 11/18. 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.
mié. 12/36:00 amONT - SKG
2 stops44h 50mKLM
dom. 12/712:25 pmSKG - ONT
2 stops44h 22mKLM
Deal found 11/18$675
This United Airlines deal was found by Cheapflights users on 11/19. 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.
vie. 11/285:05 amONT - ATH
2 stops27h 00mUnited Airlines
jue. 12/186:35 amATH - ONT
2 stops25h 50mUnited Airlines
Deal found 11/19$842
This Travelocity deal was found by Cheapflights users on 11/19. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/23:19 pmONT - ATH
2 stops18h 11mBritish Airways
mié. 12/107:50 amATH - ONT
2 stops22h 13mBritish Airways
Deal found 11/19$863
This United Airlines deal was found by Cheapflights users on 11/19. 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.
lun. 11/241:40 pmONT - ATH
2 stops24h 45mUnited Airlines
lun. 12/11:10 pmATH - ONT
2 stops42h 39mUnited Airlines
Deal found 11/19$872
This United Airlines deal was found by Cheapflights users on 11/19. 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.
lun. 12/2911:59 pmONT - ATH
2 stops50h 01mUnited Airlines
jue. 1/82:10 pmATH - ONT
2 stops56h 07mUnited Airlines
Deal found 11/19$909
This United Airlines deal was found by Cheapflights users on 11/19. 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.
lun. 12/2911:59 pmONT - ATH
2 stops50h 01mUnited Airlines
mié. 1/712:50 pmATH - ONT
2 stops44h 03mUnited Airlines
Deal found 11/19$1,017
This oojo deal was found by Cheapflights users on 11/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/2412:55 pmONT - ATH
2 stops37h 20mBritish Airways
sáb. 1/104:55 pmATH - ONT
2 stops39h 53mBritish Airways
Deal found 11/20$1,164
This American Airlines deal was found by Cheapflights users on 11/19. 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.
vie. 12/510:47 amONT - ATH
2 stops19h 08mMultiple Airlines
vie. 12/197:45 amATH - ONT
2 stops26h 29mMultiple Airlines
Deal found 11/19$1,182
This British Airways deal was found by Cheapflights users on 11/19. 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.
dom. 12/284:47 pmONT - ATH
2 stops22h 33mBritish Airways
jue. 1/84:10 pmATH - ONT
2 stops35h 12mBritish Airways
Deal found 11/19$1,194
This United Airlines deal was found by Cheapflights users on 11/20. 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.
mar. 12/21:50 pmONT - ATH
2 stops25h 05mUnited Airlines
mar. 1/62:10 pmATH - ONT
2 stops41h 48mUnited Airlines
Deal found 11/20$1,195

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 noviembre 20, 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

mar. 2/3

1:53 pm-1:40 am

2 stops25h 47m

Athens Eleftherios V.

lun. 2/9

6:25 am-10:53 pm

2 stops26h 28m

$499

OntarioAthens

ONT - ATH

ONTATH

Ontario

jue. 2/12

5:00 am-6:05 pm

2 stops27h 05m

Athens Eleftherios V.

vie. 2/27

2:05 pm-10:57 pm

2 stops18h 52m

$499

OntarioAthens

ONT - ATH

ONTATH

Ontario

jue. 1/8

6:39 pm-1:40 am

2 stops21h 01m

Athens Eleftherios V.

jue. 1/29

6:25 am-10:53 pm

2 stops26h 28m

$499

OntarioAthens

ONT - ATH

ONTATH

Ontario

jue. 1/22

1:53 pm-4:35 pm

2 stops40h 42m

Athens Eleftherios V.

lun. 1/26

6:25 am-10:53 pm

2 stops26h 28m

$511

OntarioAthens

ONT - ATH

ONTATH

Ontario

jue. 2/26

1:45 pm-5:35 pm

2 stops17h 50m

Athens Eleftherios V.

mar. 3/10

6:25 am-5:41 pm

2 stops20h 16m

$547

OntarioAthens

ONT - ATH

ONTATH

Ontario

mar. 4/28

7:00 am-10:55 pm

2 stops29h 55m

Athens Eleftherios V.

mar. 5/12

10:30 am-11:14 am

2 stops34h 44m

$601

OntarioAthens

ONT - ATH

ONTATH

Ontario

dom. 4/12

10:30 pm-7:00 am

2 stops22h 30m

Athens Eleftherios V.

mar. 5/5

10:30 am-11:20 am

2 stops34h 50m

$612

OntarioAthens

ONT - ATH

ONTATH

Ontario

mié. 4/15

1:33 pm-11:10 pm

2 stops23h 37m

Athens Eleftherios V.

mar. 5/5

1:10 pm-10:26 pm

2 stops43h 16m

$614

OntarioAthens

ONT - ATH

ONTATH

Ontario

mié. 4/15

1:33 pm-11:10 pm

2 stops23h 37m

Athens Eleftherios V.

mié. 4/29

10:25 am-10:26 pm

2 stops22h 01m

$628

OntarioAthens

ONT - ATH

ONTATH

Ontario

mié. 2/18

1:45 pm-4:35 pm

2 stops16h 50m

Athens Eleftherios V.

mié. 3/4

2:20 pm-10:57 pm

2 stops18h 37m

$632

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 22 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, August is the cheapest month in which you can book a flight from Ontario to Greece (average of $427). Flying from Ontario to Greece in July is currently the most expensive (average of $601). 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 noviembre 20, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to Greece in the afternoon. If you’re flexible enough to do this you can expect to save up to 43% on your trip compared to booking a flight in the morning.

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 noviembre 20, 2025.
Read reviews from past customers who have flown 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.
United Airlines
7.4
Good
9,029 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,029 reviews
United Airlines
7.4
Good
9,029 reviews

Entertainment

7.1

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 25h 47m. United Airlines provides one of the quickest options available for as low as $499. 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.

  • 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, August is the cheapest month in which you can book a flight from Ontario to Greece (average of $427). Flying from Ontario to Greece in July is currently the most expensive (average of $601). 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 airline flying from Ontario to Greece

Discover the top airline 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 noviembre 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$635Average$998FlexibilityNo cancel feeOn-time69%

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