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Ontario

$435+ Cheap flights from Greece to Ontario (ONT)

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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Jan 13 — Jan 201
Tue 1/13
Tue 1/20
1 adult, Economy
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Cheap flight deals from Greece to Ontario

Cheapest flights from Greece to Ontario
Explore the most affordable flight options available from Greece to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.

This United Airlines deal was found by Cheapflights users on 12/13. 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.
Thu 12/252:10 pmATH - ONT
2 stops42h 31mUnited Airlines
Wed 12/315:05 amONT - ATH
2 stops33h 20mUnited Airlines
Deal found 12/13$1,057
This United Airlines deal was found by Cheapflights users on 12/13. 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.
Thu 12/252:10 pmATH - ONT
2 stops42h 31mUnited Airlines
Thu 1/16:39 pmONT - ATH
2 stops56h 16mUnited Airlines
Deal found 12/13$1,097
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/2112:50 pmATH - ONT
2 stops38h 53mUnited Airlines
Wed 12/315:05 amONT - ATH
2 stops33h 20mUnited Airlines
Deal found 12/13$1,105
This United Airlines deal was found by Cheapflights users on 12/13. 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.
Thu 12/252:10 pmATH - ONT
2 stops42h 31mUnited Airlines
Tue 12/306:39 pmONT - ATH
2 stops59h 36mUnited Airlines
Deal found 12/13$1,130
This British Airways deal was found by Cheapflights users on 12/13. 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 12/224:55 pmATH - ONT
2 stops35h 21mBritish Airways
Wed 12/314:47 pmONT - ATH
2 stops22h 18mBritish Airways
Deal found 12/13$1,143
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/2112:50 pmATH - ONT
2 stops38h 53mUnited Airlines
Thu 1/16:39 pmONT - ATH
2 stops56h 16mUnited Airlines
Deal found 12/13$1,145
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/2012:50 pmATH - ONT
2 stops43h 51mUnited Airlines
Wed 12/315:05 amONT - ATH
2 stops33h 20mUnited Airlines
Deal found 12/13$1,165
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/2112:50 pmATH - ONT
2 stops55h 11mUnited Airlines
Tue 12/306:39 pmONT - ATH
2 stops59h 36mUnited Airlines
Deal found 12/13$1,178
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/226:35 amATH - ONT
2 stops37h 26mUnited Airlines
Thu 1/18:11 amONT - ATH
2 stops42h 44mUnited Airlines
Deal found 12/13$1,195
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/2012:50 pmATH - ONT
2 stops43h 51mUnited Airlines
Thu 1/16:39 pmONT - ATH
2 stops56h 16mUnited Airlines
Deal found 12/13$1,205
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/226:35 amATH - ONT
2 stops21h 08mUnited Airlines
Tue 12/306:39 pmONT - ATH
2 stops59h 36mUnited Airlines
Deal found 12/13$1,228
This United Airlines deal was found by Cheapflights users on 12/13. 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 12/2012:50 pmATH - ONT
2 stops43h 51mUnited Airlines
Tue 12/306:39 pmONT - ATH
2 stops59h 36mUnited Airlines
Deal found 12/13$1,237

Find flight deals from Greece to Ontario

Keep the following information in mind while searching for Greece to Ontario flight deals. Data was last updated December 14, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$953
(United Airlines)

One-way from

$455
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$936
Provider with most accurate pricing for Athens Eleftherios V.-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Athens Eleftherios V.-Los Angeles flights.
Search Deals
From Greece to Ontario
Search Deals
One-way flight from Greece to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($103 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Greece to Ontario 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 December 14, 2025.
Use the filters below to find and compare flights from Greece to Ontario that are best for you.

Fly from

Greece

Fly to

Ontario

Route

Depart

Return

Price

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 4/15

6:55 am-8:46 pm

2 stops23h 51m

Ontario

Thu 4/23

7:00 am-10:35 am

1 stop17h 35m

$953

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 1/22

6:25 am-8:58 pm

2 stops24h 33m

Ontario

Mon 1/26

6:00 am-4:35 pm

2 stops24h 35m

$956

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sun 2/15

8:00 am-10:04 pm

2 stops24h 04m

Ontario

Sun 3/1

2:44 pm-7:10 pm

2 stops18h 26m

$958

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 4/15

9:10 am-6:15 pm

1 stop19h 05m

Ontario

Thu 4/23

7:00 am-11:00 am

1 stop18h 00m

$963

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 5/21

12:35 pm-10:26 pm

1 stop19h 51m

Ontario

Wed 6/10

5:00 am-1:25 pm

2 stops22h 25m

$973

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 5/20

12:35 pm-10:26 pm

1 stop19h 51m

Ontario

Fri 5/29

5:00 am-10:10 am

2 stops19h 10m

$1,015

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 12/25

2:10 pm-10:41 pm

2 stops42h 31m

Ontario

Wed 12/31

5:05 am-12:25 am

2 stops33h 20m

$1,057

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 12/25

2:10 pm-10:41 pm

2 stops42h 31m

Ontario

Thu 1/1

6:39 pm-12:55 pm

2 stops56h 16m

$1,097

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 6/10

12:35 pm-10:26 pm

1 stop19h 51m

Ontario

Sat 6/20

7:00 am-10:35 am

1 stop17h 35m

$1,114

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 12/25

2:10 pm-10:41 pm

2 stops42h 31m

Ontario

Tue 12/30

6:39 pm-4:15 pm

2 stops59h 36m

$1,130

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Showing 1-10 of 19 results
1
2

Best time to book a flight from Greece to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Greece 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 Greece to Ontario

What is the cheapest month to book a flight from Greece to Ontario?

Currently, June is the cheapest month in which you can book a flight from Greece to Ontario (average of $368). Flying from Greece to Ontario in October is currently the most expensive (average of $806). 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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated December 14, 2025.
Read through reviews of airlines operating flights from Greece to Ontario, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,094 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,094 reviews
United Airlines
7.4
Good
9,094 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from Greece to Ontario. 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 into for flights to Ontario from Greece?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Greece. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from Greece to Ontario?

    Airlines like United Airlines and American Airlines fly from Greece to Ontario in about 23h 51m. The time it takes to get you to your destination can typically vary by up to 13m. The distance from Greece to Ontario is about 6879 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • Can I find deals for flights from Greece to Ontario that include hotel bookings?

    Yes. In addition to deals on Greece to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Greece to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Greece to Ontario.

  • Can I find deals for business class flights from Greece to Ontario?

    Yes. Cheapflights offers flight deals from Greece to Ontario 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 Greece to Ontario?

    Currently, June is the cheapest month in which you can book a flight from Greece to Ontario (average of $368). Flying from Greece to Ontario in October is currently the most expensive (average of $806). 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 airline flying from Greece to Ontario

Discover the top airline that operate flights from Greece to Ontario. 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 December 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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