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$424+ 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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$555
(Delta)

One-way from

$424
(Gotogate)

Popular in

June

Cheapest in

November

Average price

$1,075
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 ($192 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Delta deal was found by Cheapflights users on 6/9. 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 8/207:05 amONT - ATH
1 stop16h 55mDelta
Thu 8/289:10 amATH - ONT
1 stop20h 01mDelta
Deal found 6/9$555
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Mon 9/87:00 amONT - ATH
1 stop17h 30mUnited Airlines
Fri 9/2610:25 amATH - ONT
2 stops22h 05mUnited Airlines
Deal found 6/10$559
This Iberia deal was found by Cheapflights users on 6/12. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/242:54 pmONT - ATH
2 stops23h 56mMultiple Airlines
Mon 10/208:45 pmATH - ONT
2 stops37h 17mMultiple Airlines
Deal found 6/12$588
This Orbitz deal was found by Cheapflights users on 6/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2910:55 amONT - ATH
2 stops29h 05mBritish Airways
Sat 11/87:15 pmATH - ONT
2 stops36h 45mBritish Airways
Deal found 6/11$604
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1911:29 pmONT - ATH
1 stop26h 36mAmerican Airlines
Wed 8/2712:00 pmATH - ONT
1 stop19h 12mAmerican Airlines
Deal found 6/12$630
This Tripair deal was found by Cheapflights users on 6/12. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/46:25 amONT - SKG
2 stops41h 45mKLM
Wed 8/2011:00 amSKG - ONT
2 stops21h 42mKLM
Deal found 6/12$672
This KLM deal was found by Cheapflights users on 6/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/217:05 amONT - ATH
1 stop17h 05mKLM
Sat 8/309:10 amATH - ONT
1 stop20h 01mKLM
Deal found 6/10$675
This Air Canada deal was found by Cheapflights users on 6/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/195:10 amONT - ATH
3 stops21h 40mAir Canada
Wed 8/272:30 pmATH - ONT
3 stops32h 02mAir Canada
Deal found 6/12$745
This Air Serbia deal was found by Cheapflights users on 6/10. 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 Air Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2911:59 pmONT - SKG
2 stops41h 11mAir Serbia
Mon 9/14:10 pmSKG - ONT
2 stops40h 20mAir Serbia
Deal found 6/10$1,205
This British Airways deal was found by Cheapflights users on 6/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/412:46 pmONT - SKG
2 stops22h 04mBritish Airways
Tue 8/199:40 pmSKG - ONT
2 stops28h 26mBritish Airways
Deal found 6/11$1,658

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 June 12, 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

Wed 8/20

7:05 am-10:00 am

1 stop16h 55m

Athens Eleftherios V.

Thu 8/28

9:10 am-7:11 pm

1 stop20h 01m

$555

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 9/8

7:00 am-10:30 am

1 stop17h 30m

Athens Eleftherios V.

Fri 9/26

10:25 am-10:30 pm

2 stops22h 05m

$559

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 9/24

2:54 pm-12:50 am

2 stops23h 56m

Athens Eleftherios V.

Mon 10/20

8:45 pm-12:02 am

2 stops37h 17m

$588

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 10/29

10:55 am-1:00 am

2 stops29h 05m

Athens Eleftherios V.

Sat 11/8

7:15 pm-10:00 pm

2 stops36h 45m

$604

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 8/19

11:29 pm-12:05 pm

1 stop26h 36m

Athens Eleftherios V.

Wed 8/27

12:00 pm-9:12 pm

1 stop19h 12m

$630

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Mon 8/4

6:25 am-10:10 am

2 stops41h 45m

Thessaloniki Makedonia

Wed 8/20

11:00 am-10:42 pm

2 stops21h 42m

$672

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 8/21

7:05 am-10:10 am

1 stop17h 05m

Athens Eleftherios V.

Sat 8/30

9:10 am-7:11 pm

1 stop20h 01m

$675

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 8/19

5:10 am-12:50 pm

3 stops21h 40m

Athens Eleftherios V.

Wed 8/27

2:30 pm-12:32 pm

3 stops32h 02m

$745

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Tue 7/29

11:59 pm-3:10 am

2 stops41h 11m

Thessaloniki Makedonia

Mon 9/1

4:10 pm-10:30 pm

2 stops40h 20m

$1,205

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Mon 8/4

12:46 pm-8:50 pm

2 stops22h 04m

Thessaloniki Makedonia

Tue 8/19

9:40 pm-4:06 pm

2 stops28h 26m

$1,658

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 25 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, 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 $1,284). 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 June 12, 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.

Rainfall in Greece by month

Plan your trip to Greece by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Greece ranges from 0.2 - 2.5 inches per month. December is typically the wettest month, when rainfall can reach 2.5 in. June is typically the driest time to visit Greece when rainfall is around 0.2 in.

Temperature in Greece by month

Plan your trip to Greece by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Greece, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 50.0 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and LOT from Ontario to Greece to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

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
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

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
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

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.
LOT
7.6
Good
1,077 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

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
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

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.
Virgin Atlantic
7.4
Good
652 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Overall

8.0

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?

    $424 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on United Airlines and KLM, with prices starting from $429 and $481, 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 $1,284). 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 3 airlines flying from Ontario to Greece

Discover the top 3 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$940FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$552Average$824FlexibilityNo cancel feeOn-time71%
DeltaCheapest$584Average$812FlexibilityNo cancel feeOn-timeN/A

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