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$351+ 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
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
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 julio 3, 2025.

Round-trip from

$493
(Finnair)

One-way from

$351
(Trip.com)

Popular in

June

Cheapest in

November

Average price

$975
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 ($25 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 julio 3, 2025.

This Finnair deal was found by Cheapflights users on 7/1. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/56:47 amONT - ATH
2 stops18h 03mMultiple Airlines
vie. 11/141:00 pmATH - ONT
2 stops20h 45mMultiple Airlines
Deal found 7/1$493
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/196:00 amONT - ATH
2 stops19h 10mUnited Airlines
mié. 12/106:15 amATH - ONT
2 stops21h 31mUnited Airlines
Deal found 6/30$499
This Air Canada deal was found by Cheapflights users on 7/1. 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.
mié. 8/275:10 amONT - ATH
2 stops22h 50mAir Canada
jue. 9/44:00 pmATH - ONT
2 stops38h 43mAir Canada
Deal found 7/1$533
This KLM deal was found by Cheapflights users on 7/1. 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.
dom. 8/247:05 amONT - ATH
1 stop17h 50mKLM
mié. 9/39:10 amATH - ONT
1 stop20h 01mKLM
Deal found 7/1$548
This Delta deal was found by Cheapflights users on 7/1. 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.
sáb. 9/135:40 pmONT - ATH
2 stops28h 40mDelta
mar. 9/2310:30 amATH - ONT
2 stops21h 53mDelta
Deal found 7/1$561
This Iberia deal was found by Cheapflights users on 6/30. 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.
lun. 8/2510:50 amONT - ATH
2 stops18h 20mIberia
mié. 9/310:35 pmATH - ONT
2 stops30h 19mIberia
Deal found 6/30$577
This Expedia deal was found by Cheapflights users on 7/2. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/911:59 pmONT - ATH
2 stops32h 21mBritish Airways
lun. 8/187:30 pmATH - ONT
2 stops56h 22mBritish Airways
Deal found 7/2$589
This Virgin Atlantic deal was found by Cheapflights users on 7/1. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/137:05 amONT - ATH
1 stop17h 05mVirgin Atlantic
mar. 9/231:05 pmATH - ONT
2 stops20h 37mVirgin Atlantic
Deal found 7/1$621
This KLM deal was found by Cheapflights users on 7/2. 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.
mié. 11/127:00 amONT - SKG
2 stops19h 50mKLM
dom. 11/1612:25 pmSKG - ONT
2 stops44h 16mKLM
Deal found 7/2$677
This British Airways deal was found by Cheapflights users on 7/3. 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.
sáb. 9/2712:45 pmONT - SKG
2 stops21h 10mBritish Airways
mar. 10/79:40 pmSKG - ONT
2 stops28h 46mBritish Airways
Deal found 7/3$779
This Air Serbia deal was found by Cheapflights users on 7/3. 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.
mar. 7/1511:59 pmONT - SKG
2 stops29h 26mAir Serbia
dom. 8/174:05 pmSKG - ONT
2 stops40h 05mAir Serbia
Deal found 7/3$6,205

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 julio 3, 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

mié. 11/5

6:47 am-10:50 am

2 stops18h 03m

Athens Eleftherios V.

vie. 11/14

1:00 pm-11:45 pm

2 stops20h 45m

$493

OntarioAthens

ONT - ATH

ONTATH

Ontario

mié. 11/19

6:00 am-11:10 am

2 stops19h 10m

Athens Eleftherios V.

mié. 12/10

6:15 am-5:46 pm

2 stops21h 31m

$499

OntarioAthens

ONT - ATH

ONTATH

Ontario

mié. 8/27

5:10 am-2:00 pm

2 stops22h 50m

Athens Eleftherios V.

jue. 9/4

4:00 pm-8:43 pm

2 stops38h 43m

$533

OntarioAthens

ONT - ATH

ONTATH

Ontario

dom. 8/24

7:05 am-10:00 am

1 stop16h 55m

Athens Eleftherios V.

jue. 9/4

9:10 am-7:11 pm

1 stop20h 01m

$548

OntarioAthens

ONT - ATH

ONTATH

Ontario

sáb. 9/13

5:40 pm-8:20 am

2 stops28h 40m

Athens Eleftherios V.

mar. 9/23

10:30 am-10:23 pm

2 stops21h 53m

$561

OntarioAthens

ONT - ATH

ONTATH

Ontario

lun. 8/25

10:50 am-3:10 pm

2 stops18h 20m

Athens Eleftherios V.

mié. 9/3

10:35 pm-6:54 pm

2 stops30h 19m

$577

OntarioAthens

ONT - ATH

ONTATH

Ontario

sáb. 8/9

11:59 pm-6:20 pm

2 stops32h 21m

Athens Eleftherios V.

lun. 8/18

7:30 pm-5:52 pm

2 stops56h 22m

$589

OntarioAthens

ONT - ATH

ONTATH

Ontario

sáb. 9/13

7:05 am-10:10 am

1 stop17h 05m

Athens Eleftherios V.

mar. 9/23

1:05 pm-11:42 pm

2 stops20h 37m

$621

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

jue. 7/31

12:59 am-11:30 am

2 stops48h 31m

Thessaloniki Makedonia

vie. 8/8

4:15 pm-4:06 pm

2 stops33h 51m

$985

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

mar. 7/15

11:59 pm-3:25 pm

2 stops29h 26m

Thessaloniki Makedonia

dom. 8/17

4:05 pm-10:10 pm

2 stops40h 05m

$6,205

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 21 results
1
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

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 $1,288). 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 julio 3, 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 julio 3, 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
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

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
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

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
1,367 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

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
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

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
654 reviews
Delta
8.0
Very good
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

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
7,982 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

7.9

Entertainment

7.9

Overall

8.0

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 $436, 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 $1,288). 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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Alternative routes for Ontario to Greece

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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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$550Average$955FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$552Average$815FlexibilityNo cancel feeOn-time71%
DeltaCheapest$571Average$812FlexibilityNo cancel feeOn-timeN/A

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