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Greece

$316+ 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
Apr 13 — Apr 201
Mon 4/13
Mon 4/20
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 March 14, 2026.

This United Airlines deal was found by Cheapflights users on 3/10. 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 8/237:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Fri 9/111:10 pm
ATH
-
ONT
2 stops39h 09m
United Airlines
Deal found 3/10$691
This United Airlines deal was found by Cheapflights users on 3/10. 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 8/227:13 pm
ONT
-
ATH
2 stops29h 22m
United Airlines
Fri 9/111:10 pm
ATH
-
ONT
2 stops39h 09m
United Airlines
Deal found 3/10$695
This United Airlines deal was found by Cheapflights users on 3/11. 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.
Fri 10/237:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Sun 11/86:25 am
ATH
-
ONT
2 stops21h 22m
United Airlines
Deal found 3/11$700
This United Airlines deal was found by Cheapflights users on 3/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/106:30 am
ONT
-
ATH
1 stop18h 05m
United Airlines
Tue 12/156:25 am
ATH
-
ONT
2 stops24h 56m
United Airlines
Deal found 3/14$709
This British Airways deal was found by Cheapflights users on 3/10. 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.
Tue 5/54:52 pm
ONT
-
ATH
2 stops23h 18m
British Airways
Thu 5/147:25 am
ATH
-
ONT
2 stops24h 34m
British Airways
Deal found 3/10$711
This KLM deal was found by Cheapflights users on 3/12. 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.
Sun 8/307:00 am
ONT
-
ATH
1 stop18h 00m
KLM
Fri 9/49:45 am
ATH
-
ONT
1 stop18h 16m
KLM
Deal found 3/12$714
This Delta deal was found by Cheapflights users on 3/10. 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.
Sat 8/2212:00 pm
ONT
-
ATH
2 stops33h 35m
Delta
Wed 9/166:00 am
ATH
-
ONT
2 stops26h 40m
Delta
Deal found 3/10$715
This United Airlines deal was found by Cheapflights users on 3/10. 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 8/257:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Wed 9/166:00 am
ATH
-
ONT
2 stops40h 12m
United Airlines
Deal found 3/10$716
This Delta deal was found by Cheapflights users on 3/10. 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.
Sat 8/227:00 am
ONT
-
ATH
1 stop16h 20m
Delta
Thu 9/176:35 am
ATH
-
ONT
2 stops21h 26m
Delta
Deal found 3/10$718
This Delta deal was found by Cheapflights users on 3/10. 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 8/262:00 pm
ONT
-
ATH
2 stops20h 05m
Delta
Fri 9/116:00 am
ATH
-
ONT
2 stops39h 14m
Delta
Deal found 3/10$720
This United Airlines deal was found by Cheapflights users on 3/10. 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 8/237:13 pm
ONT
-
ATH
2 stops29h 22m
United Airlines
Wed 9/166:00 am
ATH
-
ONT
2 stops40h 12m
United Airlines
Deal found 3/10$721
This oojo deal was found by Cheapflights users on 3/13. 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.
Tue 9/14:54 pm
ONT
-
SKG
2 stops34h 41m
British Airways
Wed 9/91:50 pm
SKG
-
ONT
2 stops42h 00m
British Airways
Deal found 3/13$782

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 March 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$691
(United Airlines)

One-way from

$316
(oojo)

Popular in

June

Cheapest in

February

Average price

$708
Provider with most accurate pricing for Los Angeles Los Angeles-Athens Eleftherios V. flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles 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. 21% potential increase in price ($206 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 14, 2026.
Use the filters below to find and compare flights from Ontario to Greece that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 8/28

10:59 pm-1:20 pm

2 stops28h 21m

Athens Eleftherios V.

Wed 9/16

6:00 am-10:40 pm

2 stops26h 40m

$783

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Wed 9/9

4:59 pm-2:25 pm

2 stops35h 26m

Thessaloniki Makedonia

Sat 9/19

12:15 pm-5:48 pm

2 stops39h 33m

$848

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/20

6:00 am-11:00 pm

2 stops31h 00m

Athens Eleftherios V.

Sun 5/3

9:45 am-6:33 pm

1 stop18h 48m

$849

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 4/16

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Sun 4/19

12:35 pm-10:31 pm

1 stop19h 56m

$857

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 5/12

7:00 am-2:55 pm

2 stops21h 55m

Athens Eleftherios V.

Fri 5/22

12:35 pm-10:46 pm

1 stop20h 11m

$917

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 4/22

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Tue 4/28

9:45 am-9:00 pm

1 stop21h 15m

$997

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 7/11

10:59 pm-11:00 am

1 stop26h 01m

Athens Eleftherios V.

Wed 7/29

9:45 am-6:15 pm

1 stop18h 30m

$1,026

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Sat 8/8

6:00 am-8:25 pm

2 stops28h 25m

Thessaloniki Makedonia

Tue 8/11

9:15 pm-10:40 pm

2 stops59h 25m

$1,083

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 7/2

1:50 pm-10:10 am

2 stops34h 20m

Athens Eleftherios V.

Wed 7/15

3:25 pm-10:37 pm

2 stops41h 12m

$1,085

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 4/2

5:10 am-9:00 pm

2 stops29h 50m

Athens Eleftherios V.

Tue 4/7

10:25 am-10:31 pm

2 stops22h 06m

$1,106

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/11

Showing 1-10 of 44 resultsSorted by cheapest first
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5

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 $418). 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 March 14, 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
9,423 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

Entertainment

7.1

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
9,423 reviews
United Airlines
7.4
Good
9,423 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Overall

7.4

Entertainment

7.1

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 18h 05m. United Airlines provides one of the quickest options available for as low as $709. 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 $418). 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 March 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$823FlexibilityNo cancel feeOn-time69%

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