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$304+ 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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
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 July 30, 2025.

Round-trip from

$526
(United Airlines)

One-way from

$304
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$901
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 ($185 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 July 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 July 30, 2025.

This United Airlines deal was found by Cheapflights users on 7/28. 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 11/251:29 pmONT - ATH
2 stops17h 06mUnited Airlines
Tue 12/96:25 amATH - ONT
2 stops24h 17mUnited Airlines
Deal found 7/28$526
This British Airways deal was found by Cheapflights users on 7/28. 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 10/208:20 pmATH - ONT
2 stops32h 15mBritish Airways
Deal found 7/28$552
This Delta deal was found by Cheapflights users on 7/28. 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 8/237:05 amONT - ATH
1 stop17h 05mDelta
Fri 9/59:10 amATH - ONT
1 stop20h 01mDelta
Deal found 7/28$567
This Tripair deal was found by Cheapflights users on 7/30. 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.
Sat 8/236:50 pmONT - ATH
2 stops30h 20mAir Canada
Fri 9/512:10 pmATH - ONT
2 stops34h 03mAir Canada
Deal found 7/30$595
This KLM deal was found by Cheapflights users on 7/27. 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.
Wed 11/127:00 amONT - SKG
2 stops43h 50mKLM
Sun 11/1612:25 pmSKG - ONT
2 stops44h 16mKLM
Deal found 7/27$677
This Iberia deal was found by Cheapflights users on 7/30. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1110:50 amONT - SKG
2 stops24h 00mMultiple Airlines
Tue 8/269:40 pmSKG - ONT
2 stops35h 08mMultiple Airlines
Deal found 7/30$2,282
This British Airways deal was found by Cheapflights users on 7/29. 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.
Sat 8/212:46 pmONT - SKG
2 stops37h 49mBritish Airways
Fri 8/84:55 pmSKG - ONT
2 stops34h 57mBritish Airways
Deal found 7/29$2,908

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 July 30, 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

Tue 11/25

1:29 pm-4:35 pm

2 stops17h 06m

Athens Eleftherios V.

Tue 12/9

6:25 am-8:42 pm

2 stops24h 17m

$526

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 9/24

4:45 pm-12:50 am

2 stops22h 05m

Athens Eleftherios V.

Mon 10/20

8:20 pm-6:35 pm

2 stops32h 15m

$552

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 8/23

7:05 am-10:10 am

1 stop17h 05m

Athens Eleftherios V.

Fri 9/5

9:10 am-7:11 pm

1 stop20h 01m

$567

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 8/23

6:50 pm-11:10 am

2 stops30h 20m

Athens Eleftherios V.

Fri 9/5

12:10 pm-12:13 pm

2 stops34h 03m

$595

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Fri 10/10

7:00 am-12:55 pm

2 stops19h 55m

Thessaloniki Makedonia

Fri 10/31

1:40 pm-10:26 am

2 stops29h 46m

$1,330

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Mon 8/11

10:50 am-8:50 pm

2 stops24h 00m

Thessaloniki Makedonia

Tue 8/26

9:40 pm-10:48 pm

2 stops35h 08m

$2,282

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Sat 8/2

12:46 pm-12:35 pm

2 stops37h 49m

Thessaloniki Makedonia

Fri 8/8

4:55 pm-5:52 pm

2 stops34h 57m

$2,908

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 10/9

7:35 pm-6:15 am

2 stops24h 40m

$304

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 8/12

7:00 am-10:30 am

1 stop17h 30m

$399

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 8/18

7:05 am-10:00 am

1 stop16h 55m

$418

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 16 results
1
2

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 $1,287). 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 July 30, 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 July 30, 2025.
Read reviews from past customers who have flown Delta, KLM, 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
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

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
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

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.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

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
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

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.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

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.
Air Canada
7.1
Good
9,837 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

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.

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

    $399 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on KLM and Air Canada, with prices starting from $418 and $420, 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 $1,287). 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$955FlexibilityNo cancel feeOn-time69%
DeltaCheapest$571Average$771FlexibilityNo cancel feeOn-timeN/A

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