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Greece

$408+ 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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
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 October 28, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$501
(United Airlines)

One-way from

$408
(Gotogate)

Popular in

June

Cheapest in

February

Average price

$750
Provider with most accurate pricing for Los Angeles-Athens Eleftherios V. flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Athens Eleftherios V. flights.
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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 ($27 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 28, 2025.

This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/37:00 amONT - ATH
2 stops41h 05mUnited Airlines
Tue 11/1812:25 pmATH - ONT
2 stops34h 06mUnited Airlines
Deal found 10/27$490
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 11/126:05 amONT - ATH
2 stops19h 30mUnited Airlines
Wed 11/192:20 pmATH - ONT
2 stops18h 31mUnited Airlines
Deal found 10/28$501
This Delta deal was found by Cheapflights users on 10/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1010:25 pmONT - ATH
2 stops26h 10mDelta
Fri 11/2112:50 pmATH - ONT
2 stops32h 16mDelta
Deal found 10/27$503
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 10/295:05 amONT - ATH
2 stops19h 00mUnited Airlines
Wed 11/56:35 amATH - ONT
2 stops24h 09mUnited Airlines
Deal found 10/28$507
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/85:05 amONT - ATH
2 stops34h 35mUnited Airlines
Tue 1/1312:50 pmATH - ONT
2 stops20h 03mUnited Airlines
Deal found 10/27$510
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/125:05 amONT - ATH
2 stops19h 00mUnited Airlines
Thu 11/2012:25 pmATH - ONT
2 stops44h 06mUnited Airlines
Deal found 10/27$513
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/115:05 amONT - ATH
2 stops19h 00mUnited Airlines
Wed 11/1912:25 pmATH - ONT
3 stops44h 26mUnited Airlines
Deal found 10/27$518
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:00 amONT - ATH
2 stops41h 20mUnited Airlines
Thu 11/2012:25 pmATH - ONT
2 stops44h 06mUnited Airlines
Deal found 10/27$519
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/101:50 pmONT - ATH
2 stops24h 35mUnited Airlines
Wed 12/176:35 amATH - ONT
2 stops26h 14mUnited Airlines
Deal found 10/27$522
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/71:50 pmONT - ATH
2 stops24h 35mUnited Airlines
Tue 1/1312:50 pmATH - ONT
2 stops20h 03mUnited Airlines
Deal found 10/27$523
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:41 pmONT - ATH
2 stops35h 54mUnited Airlines
Tue 1/1312:50 pmATH - ONT
2 stops20h 03mUnited Airlines
Deal found 10/27$529
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:41 pmONT - ATH
2 stops20h 59mUnited Airlines
Tue 1/1312:50 pmATH - ONT
2 stops20h 03mUnited Airlines
Deal found 10/27$530

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 October 28, 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 1/21

5:05 am-12:00 pm

3 stops20h 55m

Athens Eleftherios V.

Wed 1/28

6:15 am-10:53 pm

2 stops26h 38m

$509

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 12/9

1:34 pm-1:40 am

2 stops26h 06m

Athens Eleftherios V.

Tue 1/13

12:50 pm-10:53 pm

2 stops20h 03m

$510

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/28

1:53 pm-1:40 am

2 stops25h 47m

Athens Eleftherios V.

Thu 2/5

6:35 am-8:58 pm

2 stops24h 23m

$512

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 1/27

1:53 pm-1:40 am

2 stops25h 47m

Athens Eleftherios V.

Thu 2/5

12:50 pm-10:53 pm

2 stops20h 03m

$512

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 1/27

1:53 pm-1:40 am

2 stops25h 47m

Athens Eleftherios V.

Wed 2/4

12:50 pm-10:53 pm

2 stops20h 03m

$512

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/28

1:53 pm-1:40 am

2 stops25h 47m

Athens Eleftherios V.

Wed 2/4

12:50 pm-10:53 pm

2 stops20h 03m

$512

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/21

7:16 am-6:50 pm

2 stops25h 34m

Athens Eleftherios V.

Wed 1/28

7:50 am-10:48 pm

2 stops24h 58m

$514

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 1/24

3:30 pm-1:35 pm

2 stops60h 05m

Athens Eleftherios V.

Fri 2/6

6:05 am-10:29 pm

2 stops26h 24m

$516

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 12/10

1:50 pm-12:25 am

2 stops24h 35m

Athens Eleftherios V.

Wed 12/17

6:35 am-10:49 pm

2 stops26h 14m

$522

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 12/6

6:41 pm-4:35 pm

2 stops35h 54m

Athens Eleftherios V.

Tue 1/13

12:50 pm-10:53 pm

2 stops20h 03m

$529

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 25 results
1
2
3

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 $433). Flying from Ontario to Greece in July is currently the most expensive (average of $601). 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 October 28, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to Greece in the afternoon. If you’re flexible enough to do this you can expect to save up to 43% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Ontario to Greece?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Greece. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Greece flight should consider departing on Monday afternoons when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 28, 2025.
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
9,001 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

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
9,001 reviews
United Airlines
7.4
Good
9,001 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

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 20h 55m. United Airlines provides one of the quickest options available for as low as $509. 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.

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

    $408 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 $415 and $840, 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, August is the cheapest month in which you can book a flight from Ontario to Greece (average of $433). Flying from Ontario to Greece in July is currently the most expensive (average of $601). 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 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$635Average$998FlexibilityNo cancel feeOn-time69%

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