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Greece

$366+ 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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Jun 24 — Jul 11
Wed 6/24
Wed 7/1
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 May 25, 2026.

This United Airlines deal was found by Cheapflights users on 5/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/141:18 pm
ONT
-
ATH
2 stops23h 47m
United Airlines
Wed 9/2312:10 pm
ATH
-
ONT
2 stops42h 06m
United Airlines
Deal found 5/23$801
This Air Canada deal was found by Cheapflights users on 5/21. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/291:18 pm
ONT
-
ATH
2 stops34h 52m
Air Canada
Tue 9/812:10 pm
ATH
-
ONT
2 stops41h 51m
Air Canada
Deal found 5/21$803
This Delta deal was found by Cheapflights users on 5/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:05 am
ONT
-
ATH
1 stop17h 55m
Delta
Fri 10/29:45 am
ATH
-
ONT
1 stop18h 19m
Delta
Deal found 5/23$814
This United Airlines deal was found by Cheapflights users on 5/20. 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.
Sun 9/277:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Tue 10/136:45 am
ATH
-
ONT
2 stops26h 14m
United Airlines
Deal found 5/20$818
This KLM deal was found by Cheapflights users on 5/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:05 am
ONT
-
ATH
1 stop17h 55m
KLM
Wed 9/29:45 am
ATH
-
ONT
1 stop18h 16m
KLM
Deal found 5/22$820
This Delta deal was found by Cheapflights users on 5/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2312:00 pm
ONT
-
ATH
2 stops25h 00m
Delta
Wed 10/76:00 am
ATH
-
ONT
2 stops21h 17m
Delta
Deal found 5/22$823
This United Airlines deal was found by Cheapflights users on 5/22. 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 8/235:00 am
ONT
-
ATH
2 stops19h 10m
United Airlines
Tue 9/111:45 am
ATH
-
ONT
2 stops20h 50m
United Airlines
Deal found 5/22$828
This United Airlines deal was found by Cheapflights users on 5/21. 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 9/266:32 pm
ONT
-
ATH
2 stops30h 03m
United Airlines
Tue 10/1310:25 am
ATH
-
ONT
2 stops45h 33m
United Airlines
Deal found 5/21$830
This Air Canada deal was found by Cheapflights users on 5/21. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/261:49 pm
ONT
-
ATH
2 stops37h 51m
Air Canada
Tue 10/1312:10 pm
ATH
-
ONT
2 stops34h 31m
Air Canada
Deal found 5/21$836
This Delta deal was found by Cheapflights users on 5/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/97:05 am
ONT
-
ATH
1 stop16h 55m
Delta
Wed 9/29:45 am
ATH
-
ONT
1 stop18h 16m
Delta
Deal found 5/21$857
This British Airways deal was found by Cheapflights users on 5/20. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:31 pm
ONT
-
SKG
2 stops19h 59m
British Airways
Tue 10/610:05 pm
SKG
-
ONT
2 stops29h 42m
British Airways
Deal found 5/20$1,049
This Turkish Airlines deal was found by Cheapflights users on 5/24. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/32:14 pm
ONT
-
SKG
2 stops20h 11m
Multiple Airlines
Sun 10/119:35 am
SKG
-
ONT
2 stops24h 07m
Multiple Airlines
Deal found 5/24$1,188

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 May 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$801
(United Airlines)

One-way from

$366
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$916
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. 24% potential increase in price ($252 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 25, 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
Quickest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 9/7

7:00 am-11:00 am

1 stop18h 00m

Athens Eleftherios V.

Wed 9/16

9:45 am-6:01 pm

1 stop18h 16m

$986

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 7/12

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Wed 7/22

9:45 am-6:23 pm

1 stop18h 38m

$986

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Wed 9/23

1:31 pm-7:30 pm

2 stops19h 59m

Thessaloniki Makedonia

Tue 10/6

10:05 pm-5:47 pm

2 stops29h 42m

$1,049

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 8/7

6:10 am-10:35 am

1 stop18h 25m

Athens Eleftherios V.

Mon 8/24

11:45 am-10:35 pm

2 stops20h 50m

$1,052

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 7/13

5:00 am-10:10 am

2 stops19h 10m

Athens Eleftherios V.

Thu 7/23

12:35 pm-10:51 pm

1 stop20h 16m

$1,115

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 7/13

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Wed 7/22

9:45 am-6:23 pm

1 stop18h 38m

$1,154

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 7/5

7:00 am-11:45 am

1 stop18h 45m

Athens Eleftherios V.

Tue 7/21

12:00 pm-10:34 pm

1 stop20h 34m

$1,155

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 7/2

6:39 pm-8:10 am

2 stops51h 31m

Athens Eleftherios V.

Wed 7/15

12:35 pm-10:51 pm

1 stop20h 16m

$1,234

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 7/7

7:00 am-11:45 am

1 stop18h 45m

Athens Eleftherios V.

Thu 7/30

2:05 pm-11:59 pm

1 stop19h 54m

$1,322

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 7/6

5:34 am-11:45 am

1 stop20h 11m

Athens Eleftherios V.

Tue 7/14

2:00 pm-10:32 pm

1 stop18h 32m

$1,323

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/20

Showing 1-10 of 39 resultsSorted by cheapest first
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2
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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
No data available for this route at this time. Please check back soon.

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 May 25, 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
9,747 reviews

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,747 reviews
United Airlines
7.4
Good
9,747 reviews

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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. KLM provides one of the quickest options available for as low as $986. 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.

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 May 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$836FlexibilityNo cancel feeOn-time69%

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