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Ontario

$623+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
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 January 27, 2026.

This Orbitz deal was found by Cheapflights users on 1/26. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/87:25 am
ATH
-
ONT
2 stops26h 43m
Multiple Airlines
Mon 9/75:00 am
ONT
-
ATH
2 stops19h 10m
Multiple Airlines
Deal found 1/26$934
This United Airlines deal was found by Cheapflights users on 1/26. 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 4/156:45 am
ATH
-
ONT
2 stops21h 02m
United Airlines
Fri 4/247:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 1/26$963
This United Airlines deal was found by Cheapflights users on 1/25. 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 2/231:10 pm
ATH
-
ONT
2 stops19h 47m
United Airlines
Tue 3/31:45 pm
ONT
-
ATH
2 stops16h 50m
United Airlines
Deal found 1/25$966
This United Airlines deal was found by Cheapflights users on 1/25. 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 8/1712:35 pm
ATH
-
ONT
1 stop19h 51m
United Airlines
Mon 8/317:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 1/25$978
This KLM deal was found by Cheapflights users on 1/26. 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.
Fri 8/79:10 am
ATH
-
ONT
1 stop18h 51m
KLM
Sun 8/237:00 am
ONT
-
ATH
1 stop18h 00m
KLM
Deal found 1/26$1,079
This United Airlines deal was found by Cheapflights users on 1/26. 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 8/86:00 am
ATH
-
ONT
2 stops40h 33m
United Airlines
Mon 9/77:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 1/26$1,127
This United Airlines deal was found by Cheapflights users on 1/26. 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 1/306:05 am
ATH
-
ONT
2 stops45h 46m
United Airlines
Tue 2/36:00 am
ONT
-
ATH
2 stops24h 35m
United Airlines
Deal found 1/26$1,141
This Priceline deal was found by Cheapflights users on 1/26. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/87:25 am
ATH
-
ONT
2 stops24h 49m
British Airways
Mon 9/78:15 am
ONT
-
ATH
1 stop17h 30m
British Airways
Deal found 1/26$1,152
This KLM deal was found by Cheapflights users on 1/26. 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.
Thu 7/99:10 am
ATH
-
ONT
1 stop18h 51m
KLM
Mon 8/37:00 am
ONT
-
ATH
1 stop18h 00m
KLM
Deal found 1/26$1,156

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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$884
(Gurufare)

One-way from

$623
(American Airlines)

Popular in

January

Cheapest in

September

Average price

$1,038
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. 10% potential increase in price ($99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 27, 2026.
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.

Mon 2/23

1:10 pm-10:57 pm

2 stops19h 47m

Ontario

Tue 3/3

1:45 pm-4:35 pm

2 stops16h 50m

$966

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 2/24

6:25 am-5:41 pm

2 stops21h 16m

Ontario

Tue 3/3

1:45 pm-4:35 pm

2 stops16h 50m

$966

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 4/15

6:45 am-5:47 pm

2 stops21h 02m

Ontario

Fri 4/24

6:45 pm-11:05 pm

2 stops18h 20m

$967

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 7/9

9:10 am-6:01 pm

1 stop18h 51m

Ontario

Mon 8/3

7:00 am-11:00 am

1 stop18h 00m

$1,156

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 2/9

7:45 am-8:10 pm

2 stops22h 25m

Ontario

Tue 2/24

2:39 pm-7:30 pm

2 stops18h 51m

$1,209

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 2/10

2:20 pm-6:45 pm

2 stops38h 25m

Ontario

Sat 2/14

2:39 pm-1:25 am

2 stops24h 46m

$1,223

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 6/18

2:05 pm-11:59 pm

1 stop19h 54m

Ontario

Thu 7/16

6:00 am-11:45 am

1 stop19h 45m

$1,260

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 6/18

2:05 pm-11:59 pm

1 stop19h 54m

Ontario

Sat 7/18

6:00 am-11:45 am

1 stop19h 45m

$1,295

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 5/27

2:00 pm-11:59 pm

1 stop19h 59m

Ontario

Wed 6/3

7:20 am-11:45 am

1 stop18h 25m

$1,309

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sat 5/9

7:25 am-10:35 pm

2 stops25h 10m

$623

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 19 results
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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 $361). 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 January 27, 2026.
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
9,205 reviews

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

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
9,205 reviews
United Airlines
7.4
Good
9,205 reviews

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

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 KLM fly from Greece to Ontario in about 18h 51m. The time it takes to get you to your destination can typically vary by up to 56m. 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 $361). 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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Alternative routes for Greece to Ontario

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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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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