HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Greece

$270+ 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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Dec 18 — Dec 251
Thu 12/18
Thu 12/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Greece with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 November 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$501
(Iberia)

One-way from

$270
(Expedia)

Popular in

June

Cheapest in

February

Average price

$634
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. 19% potential increase in price ($187 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 18, 2025.

This United Airlines deal was found by Cheapflights users on 11/16. 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 11/246:38 pmONT - ATH
2 stops21h 02mUnited Airlines
Wed 12/36:35 amATH - ONT
2 stops24h 07mUnited Airlines
Deal found 11/16$509
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/256:00 amONT - ATH
2 stops33h 40mUnited Airlines
Fri 12/56:05 amATH - ONT
2 stops21h 32mUnited Airlines
Deal found 11/16$512
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/256:00 amONT - ATH
2 stops33h 40mUnited Airlines
Wed 12/36:35 amATH - ONT
2 stops21h 02mUnited Airlines
Deal found 11/16$514
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/266:00 amONT - ATH
2 stops32h 25mUnited Airlines
Thu 12/46:25 amATH - ONT
2 stops26h 24mUnited Airlines
Deal found 11/16$520
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/265:05 amONT - ATH
2 stops33h 20mUnited Airlines
Wed 12/36:35 amATH - ONT
2 stops24h 07mUnited Airlines
Deal found 11/16$522
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/256:00 amONT - ATH
2 stops33h 40mUnited Airlines
Thu 12/46:25 amATH - ONT
3 stops50h 24mUnited Airlines
Deal found 11/16$523
This Delta deal was found by Cheapflights users on 11/16. 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.
Fri 11/2110:25 pmONT - ATH
2 stops50h 10mDelta
Fri 12/512:50 pmATH - ONT
2 stops56h 12mDelta
Deal found 11/16$524
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/236:38 pmONT - ATH
2 stops43h 47mUnited Airlines
Fri 12/56:05 amATH - ONT
3 stops26h 44mUnited Airlines
Deal found 11/16$525
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/231:40 pmONT - ATH
2 stops40h 55mUnited Airlines
Thu 12/46:35 amATH - ONT
3 stops26h 14mUnited Airlines
Deal found 11/16$527
This United Airlines deal was found by Cheapflights users on 11/16. 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 11/261:40 pmONT - ATH
2 stops24h 45mUnited Airlines
Tue 12/212:50 pmATH - ONT
2 stops41h 52mUnited Airlines
Deal found 11/16$532
This KLM deal was found by Cheapflights users on 11/16. 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 12/36:00 amONT - SKG
2 stops44h 50mKLM
Sun 12/712:25 pmSKG - ONT
2 stops41h 14mKLM
Deal found 11/16$620
This Turkish Airlines deal was found by Cheapflights users on 11/17. 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.
Wed 11/266:00 amONT - SKG
2 stops28h 55mMultiple Airlines
Mon 12/19:30 amSKG - ONT
2 stops35h 49mMultiple Airlines
Deal found 11/17$1,591

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 November 18, 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

Sun 1/18

6:00 am-1:35 pm

2 stops21h 35m

Athens Eleftherios V.

Thu 2/5

6:05 am-10:51 pm

2 stops26h 46m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/21

10:30 pm-1:35 pm

2 stops29h 05m

Athens Eleftherios V.

Fri 2/6

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 1/20

6:00 am-1:35 pm

2 stops21h 35m

Athens Eleftherios V.

Fri 2/6

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 1/17

6:00 am-1:35 pm

2 stops21h 35m

Athens Eleftherios V.

Fri 2/6

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/21

10:30 pm-1:35 pm

2 stops29h 05m

Athens Eleftherios V.

Mon 2/2

6:05 am-10:51 pm

2 stops26h 46m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 1/23

5:10 pm-1:35 pm

2 stops34h 25m

Athens Eleftherios V.

Wed 2/4

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 1/23

5:10 pm-1:35 pm

2 stops34h 25m

Athens Eleftherios V.

Sun 2/8

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/21

5:10 pm-1:35 pm

2 stops34h 25m

Athens Eleftherios V.

Wed 2/4

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 1/17

6:00 am-1:35 pm

2 stops21h 35m

Athens Eleftherios V.

Wed 2/4

6:05 am-9:05 pm

2 stops25h 00m

$500

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 1/17

1:10 pm-1:35 pm

2 stops38h 25m

Athens Eleftherios V.

Thu 2/5

6:05 am-10:51 pm

2 stops26h 46m

$500

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/17

Showing 1-10 of 28 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 $427). 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 November 18, 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.

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 November 18, 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
9,019 reviews

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

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
9,019 reviews
United Airlines
7.4
Good
9,019 reviews

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

Crew

8.1

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 21h 35m. Delta provides one of the quickest options available for as low as $500. 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?

    $270 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Iberia and United Airlines, with prices starting from $336 and $406, 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 $427). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Greece

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Heathrow flights
Los Angeles to Charles de Gaulle flights
San Francisco to Heathrow flights
San Francisco to Charles de Gaulle flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
Los Angeles to Orly flights
Los Angeles to Gatwick flights
Los Angeles to Istanbul flights
Los Angeles to Madrid flights
Los Angeles to London City flights
San Francisco to Istanbul flights
San Francisco to Leonardo da Vinci/Fiumicino flights
San Francisco to Gatwick flights
Los Angeles to Frankfurt flights
San Francisco to London City flights
San Francisco to Lisbon flights
Los Angeles to Barcelona-El Prat flights
San Francisco to Frankfurt flights
Los Angeles to Amsterdam flights
Los Angeles to Zurich flights
Ontario to Charles de Gaulle flights
Los Angeles to Stansted flights
San Francisco to Zurich flights
San Francisco to Barcelona-El Prat flights
San Francisco to Orly flights
Los Angeles to Dublin flights
Ontario to Heathrow flights
San Diego to Heathrow flights
Los Angeles to Lisbon flights
San Francisco to Amsterdam flights
Los Angeles to Palma de Mallorca flights
Los Angeles to Luton flights
Ontario to Palma de Mallorca flights
San Francisco to Dublin flights
San Francisco to Madrid flights
Santa Ana to Heathrow flights
Santa Ana to Charles de Gaulle flights
Los Angeles to Athens flights
San Francisco to Stansted flights
San Francisco to Munich flights
Los Angeles to Beauvais-Tille flights
San Francisco to Malpensa flights
Ontario to Leonardo da Vinci/Fiumicino flights
Los Angeles to Malpensa flights
Los Angeles to Copenhagen flights
San Francisco to Linate flights
Los Angeles to Munich flights
Burbank to Charles de Gaulle flights
Las Vegas to Heathrow flights
San Francisco to Sabiha Gokcen flights

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 November 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$635Average$998FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.