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Greece

$257+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Mar 25 — Apr 11
Wed 3/25
Wed 4/1
1 adult, Economy
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Cheap 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 February 23, 2026.

This United Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 8/195:00 am
ONT
-
ATH
2 stops19h 10m
United Airlines
Thu 9/312:35 pm
ATH
-
ONT
1 stop19h 51m
United Airlines
Deal found 2/19$590
This United Airlines deal was found by Cheapflights users on 2/22. 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 9/66:02 am
ONT
-
ATH
2 stops17h 58m
United Airlines
Wed 9/1611:45 am
ATH
-
ONT
2 stops20h 41m
United Airlines
Deal found 2/22$599
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Sat 9/57:00 am
ONT
-
ATH
2 stops41h 00m
United Airlines
Wed 9/1611:45 am
ATH
-
ONT
2 stops20h 41m
United Airlines
Deal found 2/22$610
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Sat 9/57:00 am
ONT
-
ATH
2 stops41h 00m
United Airlines
Thu 9/1711:45 am
ATH
-
ONT
2 stops44h 41m
United Airlines
Deal found 2/22$616
This Tripair deal was found by Cheapflights users on 2/23. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:00 am
ONT
-
ATH
2 stops21h 35m
Multiple Airlines
Tue 3/171:45 pm
ATH
-
ONT
2 stops35h 43m
Multiple Airlines
Deal found 2/23$617
This United Airlines deal was found by Cheapflights users on 2/21. 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.
Sat 3/216:37 pm
ONT
-
ATH
2 stops54h 33m
United Airlines
Fri 4/36:00 am
ATH
-
ONT
2 stops40h 38m
United Airlines
Deal found 2/21$620
This Tripair deal was found by Cheapflights users on 2/21. 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 4/612:57 pm
ONT
-
ATH
1 stop36h 03m
Multiple Airlines
Tue 4/216:00 am
ATH
-
ONT
2 stops21h 15m
Multiple Airlines
Deal found 2/21$624
This oojo deal was found by Cheapflights users on 2/20. 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.
Wed 10/214:59 pm
ONT
-
ATH
2 stops23h 26m
British Airways
Wed 11/48:20 pm
ATH
-
ONT
2 stops35h 39m
British Airways
Deal found 2/20$626
This oojo deal was found by Cheapflights users on 2/21. 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.
Thu 11/192:59 pm
ONT
-
ATH
2 stops24h 26m
British Airways
Mon 11/304:55 pm
ATH
-
ONT
2 stops39h 04m
British Airways
Deal found 2/21$635
This British Airways deal was found by Cheapflights users on 2/22. 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.
Sun 9/66:10 am
ONT
-
ATH
1 stop19h 35m
Multiple Airlines
Wed 9/166:55 am
ATH
-
ONT
2 stops27h 22m
Multiple Airlines
Deal found 2/22$639
This oojo deal was found by Cheapflights users on 2/21. 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.
Mon 8/2412:47 pm
ONT
-
ATH
2 stops20h 18m
British Airways
Mon 9/78:50 pm
ATH
-
ONT
2 stops54h 58m
British Airways
Deal found 2/21$640
This oojo deal was found by Cheapflights users on 2/22. 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.
Mon 5/184:52 pm
ONT
-
SKG
2 stops34h 08m
British Airways
Mon 5/251:20 pm
SKG
-
ONT
2 stops40h 36m
British Airways
Deal found 2/22$847

Find flight deals from Ontario to Greece

Keep the following information in mind while searching for Ontario to Greece flight deals. Data was last updated February 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$620
(United Airlines)

One-way from

$257
(oojo)

Popular in

June

Cheapest in

February

Average price

$588
Provider with most accurate pricing for Los Angeles-Athens Eleftherios V. flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Athens Eleftherios V. flights.
Search Deals
From Ontario to Greece
Search Deals
One-way flight from Ontario to Greece
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($196 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 23, 2026.
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

Wed 8/19

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Thu 9/3

12:35 pm-10:26 pm

1 stop19h 51m

$655

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 8/19

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Wed 9/2

12:35 pm-10:26 pm

1 stop19h 51m

$655

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 4/30

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Wed 5/13

12:35 pm-10:30 pm

1 stop19h 55m

$684

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/20

5:10 am-11:05 pm

2 stops31h 55m

Athens Eleftherios V.

Sun 5/3

12:10 pm-5:52 pm

2 stops39h 42m

$737

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Mon 5/18

4:52 pm-1:00 pm

2 stops34h 08m

Thessaloniki Makedonia

Mon 5/25

1:20 pm-7:56 pm

2 stops40h 36m

$847

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 7/22

7:20 am-11:45 am

1 stop18h 25m

Athens Eleftherios V.

Wed 8/5

12:00 pm-9:28 pm

1 stop19h 28m

$920

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 7/2

1:50 pm-10:10 am

3 stops34h 20m

Athens Eleftherios V.

Wed 7/15

3:25 pm-10:37 pm

2 stops41h 12m

$960

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 4/14

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Tue 4/28

9:45 am-9:00 pm

1 stop21h 15m

$977

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 3/21

10:25 pm-4:35 pm

2 stops33h 10m

Athens Eleftherios V.

Fri 4/3

9:45 am-9:00 pm

1 stop21h 15m

$1,016

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Sun 8/16

11:59 pm-8:25 pm

2 stops34h 26m

Thessaloniki Makedonia

Sun 8/23

9:15 pm-10:40 pm

2 stops35h 25m

$1,058

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 35 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 $420). Flying from Ontario to Greece in June is currently the most expensive (average of $646). 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.

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 February 23, 2026.
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
9,344 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

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
9,344 reviews
United Airlines
7.4
Good
9,344 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

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 17h 35m. United Airlines provides one of the quickest options available for as low as $655. 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 $420). Flying from Ontario to Greece in June is currently the most expensive (average of $646). 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 February 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$603Average$901FlexibilityNo cancel feeOn-time69%

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