HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Greece

$366+ 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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
May 2 — May 91
Sat 5/2
Sat 5/9
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

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 April 2, 2026.

This United Airlines deal was found by Cheapflights users on 4/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:00 am
ONT
-
ATH
2 stops19h 10m
United Airlines
Wed 9/91:10 pm
ATH
-
ONT
2 stops39h 01m
United Airlines
Deal found 4/1$801
This FlightHub deal was found by Cheapflights users on 3/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2810:56 pm
ONT
-
ATH
2 stops23h 59m
Turkish Airlines
Sun 10/113:55 am
ATH
-
ONT
2 stops27h 34m
Turkish Airlines
Deal found 3/28$803
This Air Canada deal was found by Cheapflights users on 3/31. 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.
Sun 8/165:00 am
ONT
-
ATH
2 stops20h 10m
Air Canada
Wed 9/23:25 pm
ATH
-
ONT
2 stops31h 13m
Air Canada
Deal found 3/31$808
This oojo deal was found by Cheapflights users on 3/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2510:56 pm
ONT
-
ATH
2 stops23h 59m
Turkish Airlines
Fri 10/910:00 pm
ATH
-
ONT
2 stops33h 29m
Turkish Airlines
Deal found 3/28$814
This oojo deal was found by Cheapflights users on 3/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/224:59 pm
ONT
-
ATH
2 stops23h 11m
British Airways
Wed 9/307:00 pm
ATH
-
ONT
2 stops33h 57m
British Airways
Deal found 3/30$817
This United Airlines deal was found by Cheapflights users on 3/30. 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.
Sun 8/26:30 am
ONT
-
ATH
1 stop18h 05m
United Airlines
Tue 11/176:25 am
ATH
-
ONT
2 stops21h 22m
United Airlines
Deal found 3/30$823
This KLM deal was found by Cheapflights users on 3/28. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:05 am
ONT
-
ATH
1 stop17h 55m
KLM
Tue 5/1212:10 pm
ATH
-
ONT
1 stop19h 38m
KLM
Deal found 3/28$833
This Kissandfly.com deal was found by Cheapflights users on 3/28. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:00 am
ONT
-
ATH
1 stop17h 35m
Lufthansa
Tue 5/1211:45 am
ATH
-
ONT
2 stops20h 50m
Lufthansa
Deal found 3/28$837
This Expedia deal was found by Cheapflights users on 4/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:22 pm
ONT
-
ATH
1 stop35h 23m
Iberia
Wed 9/96:55 am
ATH
-
ONT
2 stops26h 11m
Iberia
Deal found 4/1$842
This KLM deal was found by Cheapflights users on 4/1. 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.
Tue 5/510:15 pm
ONT
-
ATH
1 stop26h 45m
KLM
Thu 5/149:45 am
ATH
-
ONT
1 stop18h 51m
KLM
Deal found 4/1$843
This oojo deal was found by Cheapflights users on 4/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:10 pm
ONT
-
ATH
2 stops37h 20m
Turkish Airlines
Tue 9/223:40 pm
ATH
-
ONT
2 stops38h 33m
Turkish Airlines
Deal found 4/2$846
This oojo deal was found by Cheapflights users on 3/31. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/12:39 pm
ONT
-
SKG
2 stops62h 16m
British Airways
Wed 4/87:00 pm
SKG
-
ONT
2 stops33h 37m
British Airways
Deal found 3/31$1,190

Find flight deals from Ontario to Greece

Keep the following information in mind while searching for Ontario to Greece flight deals. Data was last updated April 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$801
(United Airlines)

One-way from

$366
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$728
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. 21% potential increase in price ($210 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 April 2, 2026.
Use the filters below to find and compare flights from Ontario to Greece that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 4/26

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Tue 5/12

12:10 pm-9:48 pm

1 stop19h 38m

$833

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 4/26

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Mon 5/11

9:45 am-9:48 pm

1 stop22h 03m

$892

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 4/30

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Tue 5/5

9:45 am-6:33 pm

1 stop18h 48m

$904

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 5/9

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Sun 5/17

9:45 am-6:36 pm

1 stop18h 51m

$964

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 7/20

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 7/30

9:45 am-6:23 pm

1 stop18h 38m

$985

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 8/10

7:00 am-10:00 am

1 stop17h 00m

Athens Eleftherios V.

Thu 8/20

9:45 am-6:01 pm

1 stop18h 16m

$985

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 4/23

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 4/30

9:45 am-9:00 pm

1 stop21h 15m

$1,027
Quickest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 7/25

7:05 am-9:20 am

1 stop16h 15m

Athens Eleftherios V.

Sat 8/15

9:45 am-6:01 pm

1 stop18h 16m

$1,115

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 4/14

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Sun 5/3

9:45 am-6:33 pm

1 stop18h 48m

$1,188

OntarioThessaloniki

ONT - SKG

ONTSKG

Ontario

Wed 9/23

4:59 pm-11:50 am

2 stops32h 51m

Thessaloniki Makedonia

Sat 10/24

3:50 pm-11:06 pm

2 stops41h 16m

$1,193

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/28

Showing 1-10 of 33 resultsSorted by cheapest first
1
2
3
4

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 $420). Flying from Ontario to Greece in June is currently the most expensive (average of $660). 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.

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 April 2, 2026.
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
9,533 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

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
9,533 reviews
United Airlines
7.4
Good
9,533 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

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 17h 55m. KLM provides one of the quickest options available for as low as $833. 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.

  • 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 $420). Flying from Ontario to Greece in June is currently the most expensive (average of $660). 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
Los Angeles to Leonardo da Vinci/Fiumicino flights
San Francisco to Heathrow flights
San Francisco to Charles de Gaulle flights
San Francisco to Leonardo da Vinci/Fiumicino flights
San Francisco to Barcelona-El Prat flights
Los Angeles to Gatwick flights
Los Angeles to Madrid flights
Los Angeles to Stansted flights
Los Angeles to Istanbul flights
Los Angeles to Barcelona-El Prat flights
Los Angeles to Frankfurt flights
Los Angeles to London City flights
Los Angeles to Amsterdam flights
San Francisco to Gatwick flights
San Francisco to Dublin flights
Los Angeles to Dublin flights
San Francisco to Istanbul flights
San Francisco to Stansted flights
Los Angeles to Athens flights
San Francisco to London City flights
San Francisco to Frankfurt flights
San Francisco to Lisbon flights
Los Angeles to Lisbon flights
Ontario to Heathrow flights
San Francisco to Madrid flights
San Francisco to Amsterdam flights
San Francisco to Athens flights
San Francisco to Zurich flights
San Francisco to Malpensa flights
San Diego to Heathrow flights
Los Angeles to Luton flights
Los Angeles to Copenhagen flights
Los Angeles to Orly flights
San Francisco to Munich flights
Los Angeles to Zurich flights
Los Angeles to Malpensa flights
San Francisco to Copenhagen flights
Los Angeles to Munich flights
Ontario to Leonardo da Vinci/Fiumicino flights
San Francisco to Linate flights
Las Vegas to Heathrow 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 April 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$823FlexibilityNo 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.
Site
©2026 Cheapflights