How long is the flight from Ontario to Greece?

A quick flight from Ontario to Greece can take about 20h. United Airlines provides one of the quickest options available for as low as $505. 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.

In terms of precipitation, rainfall in Greece ranges from 0.2 - 2.5 inches per month. December is typically the wettest month, when rainfall can reach 2.5 in. June is typically the driest time to visit Greece when rainfall is around 0.2 in.

If weather is an important factor for your trip to Greece, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 50.0 F).

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.

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.

$257+ Flights from Ontario to Greece

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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 December 12, 2025.

Wed 12/315:05 amONT - ATH

2 stops34h 35mUnited Airlines

Thu 1/156:35 amATH - ONT

2 stops21h 08mUnited Airlines

Deal found 12/11

$617

Wed 12/315:05 amONT - ATH

2 stops34h 35mUnited Airlines

Fri 1/167:05 amATH - ONT

2 stops39h 12mUnited Airlines

Deal found 12/11

$622

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Wed 1/147:05 amATH - ONT

2 stops25h 48mUnited Airlines

Deal found 12/11

$623

Wed 12/315:05 amONT - ATH

2 stops34h 35mUnited Airlines

Mon 1/1212:50 pmATH - ONT

2 stops42h 08mUnited Airlines

Deal found 12/11

$627

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Fri 1/166:35 amATH - ONT

2 stops39h 42mUnited Airlines

Deal found 12/11

$628

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Mon 1/1212:50 pmATH - ONT

2 stops42h 08mUnited Airlines

Deal found 12/11

$633

Mon 12/296:39 pmONT - ATH

2 stops55h 21mUnited Airlines

Wed 1/147:05 amATH - ONT

2 stops25h 48mUnited Airlines

Deal found 12/11

$714

Mon 12/296:39 pmONT - ATH

2 stops55h 21mUnited Airlines

Fri 1/166:35 amATH - ONT

2 stops39h 42mUnited Airlines

Deal found 12/11

$720

Mon 12/296:39 pmONT - ATH

2 stops55h 21mUnited Airlines

Mon 1/1212:50 pmATH - ONT

2 stops42h 08mUnited Airlines

Deal found 12/11

$725

Wed 12/311:40 pmONT - ATH

2 stops26h 00mUnited Airlines

Sun 1/112:00 pmATH - ONT

2 stops42h 53mUnited Airlines

Deal found 12/11

$863

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Sun 1/112:00 pmATH - ONT

2 stops42h 53mUnited Airlines

Deal found 12/11

$869

Mon 12/2911:59 pmONT - ATH

2 stops51h 21mBritish Airways

Sun 1/117:50 pmATH - ONT

2 stops34h 20mBritish Airways

Deal found 12/11

$913

Best flights from Ontario to Greece
Discover carefully curated flight deals from Ontario to Greece that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Thu 1/226:00 amONT - ATH

3 stops20h 00mUnited Airlines

Mon 1/266:25 amATH - ONT

2 stops26h 28mUnited Airlines

Deal found 12/9

$505

Tue 4/2811:01 amONT - ATH

2 stops22h 04mBritish Airways

Tue 5/126:30 pmATH - ONT

2 stops33h 15mBritish Airways

Deal found 12/10

$624

Mon 4/2011:55 amONT - ATH

2 stops27h 15mDelta

Sun 5/39:10 amATH - ONT

1 stop22h 59mDelta

Deal found 12/10

$731

Tue 4/2810:59 pmONT - ATH

1 stop26h 01mKLM

Tue 5/1212:10 pmATH - ONT

1 stop19h 59mKLM

Deal found 12/10

$893

Tue 1/205:05 amONT - ATH

3 stops20h 55mUnited Airlines

Tue 1/276:25 amATH - ONT

3 stops24h 33mUnited Airlines

Deal found 12/9

$705

Wed 1/143:09 pmONT - ATH

2 stops23h 56mBritish Airways

Sun 1/187:50 pmATH - ONT

2 stops31h 32mBritish Airways

Deal found 12/9

$781

Mon 3/235:15 amONT - ATH

2 stops26h 20mUnited Airlines

Sun 4/122:15 pmATH - ONT

2 stops40h 31mUnited Airlines

Deal found 12/10

$791

Sat 5/161:33 pmONT - ATH

2 stops26h 37mBritish Airways

Sun 5/248:40 pmATH - ONT

2 stops29h 52mBritish Airways

Deal found 12/10

$823

Wed 4/291:34 pmONT - ATH

2 stops18h 06mUnited Airlines

Thu 5/712:35 pmATH - ONT

1 stop19h 51mUnited Airlines

Deal found 12/10

$808

Tue 3/243:19 pmONT - ATH

2 stops19h 11mBritish Airways

Sun 4/127:05 amATH - ONT

2 stops26h 35mBritish Airways

Deal found 12/10

$840

Wed 4/111:58 pmONT - SKG

2 stops52h 47mBritish Airways

Thu 4/302:35 pmSKG - ONT

2 stops37h 10mBritish Airways

Deal found 12/10

$1,005

Tue 6/912:50 pmONT - SKG

2 stops36h 45mBritish Airways

Tue 6/2312:25 pmSKG - ONT

2 stops21h 07mBritish Airways

Deal found 12/11

$5,368

Last-minute flights from Ontario to Greece
Discover last-minute flight deals from Ontario to Greece. Data last updated December 12, 2025 and is based on user searches.

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Tue 1/137:05 amATH - ONT

2 stops25h 48mUnited Airlines

Deal found 12/11

$623

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Fri 1/166:35 amATH - ONT

2 stops39h 42mUnited Airlines

Deal found 12/11

$628

Tue 12/3011:59 pmONT - ATH

2 stops39h 41mUnited Airlines

Mon 1/1212:50 pmATH - ONT

2 stops42h 08mUnited Airlines

Deal found 12/11

$633

Wed 12/311:40 pmONT - ATH

2 stops26h 00mUnited Airlines

Wed 1/147:05 amATH - ONT

2 stops25h 48mUnited Airlines

Deal found 12/11

$617

Wed 12/315:05 amONT - ATH

2 stops34h 35mUnited Airlines

Fri 1/167:05 amATH - ONT

2 stops39h 12mUnited Airlines

Deal found 12/11

$622

Wed 12/315:05 amONT - ATH

2 stops34h 35mUnited Airlines

Mon 1/1212:50 pmATH - ONT

2 stops42h 08mUnited Airlines

Deal found 12/11

$627

Sat 1/101:24 pmONT - ATH

2 stops17h 11mUnited Airlines

Sat 1/177:05 amATH - ONT

2 stops25h 48mUnited Airlines

Deal found 12/11

$710

Sun 1/114:45 pmONT - ATH

2 stops34h 35mBritish Airways

Sun 1/258:00 amATH - ONT

2 stops24h 48mBritish Airways

Deal found 12/10

$490

Sun 1/184:45 pmONT - ATH

2 stops22h 35mBritish Airways

Sun 1/258:00 amATH - ONT

2 stops24h 13mBritish Airways

Deal found 12/10

$565

Tue 1/2010:58 amONT - ATH

2 stops22h 32mAmerican Airlines

Tue 1/277:35 amATH - ONT

3 stops25h 13mAmerican Airlines

Deal found 12/9

$508

Tue 1/205:05 amONT - ATH

3 stops20h 55mUnited Airlines

Tue 1/276:25 amATH - ONT

3 stops24h 33mUnited Airlines

Deal found 12/9

$705

Thu 1/226:00 amONT - ATH

3 stops20h 00mUnited Airlines

Mon 1/266:25 amATH - ONT

2 stops26h 28mUnited Airlines

Deal found 12/9

$505

One-way flights from Ontario to Greece
Search for one-way flight options from Ontario to Greece. Find affordable one-way fares based on user searches. Data last updated December 12, 2025.

Tue 4/141:33 pmONT - ATH

2 stops26h 37mBritish Airways

Deal found 12/11

$257

Tue 3/103:19 pmONT - ATH

2 stops25h 01mBritish Airways

Deal found 12/10

$263

Thu 3/262:47 pmONT - ATH

2 stops25h 38mBritish Airways

Deal found 12/11

$317

Fri 3/66:37 pmONT - ATH

3 stops53h 58mUnited Airlines

Deal found 12/11

$402

Sat 1/106:32 pmONT - ATH

2 stops21h 08mUnited Airlines

Deal found 12/10

$407

Sun 3/86:00 amONT - ATH

2 stops34h 40mUnited Airlines

Deal found 12/9

$418

Sun 1/115:05 amONT - ATH

2 stops25h 30mUnited Airlines

Deal found 12/10

$419

Tue 2/105:05 amONT - ATH

3 stops21h 35mUnited Airlines

Deal found 12/10

$427

Wed 3/115:15 amONT - ATH

2 stops20h 20mAir Canada

Deal found 12/10

$432

Mon 3/95:02 pmONT - ATH

2 stops21h 08mBritish Airways

Deal found 12/10

$433

Fri 3/67:30 amONT - ATH

2 stops44h 05mDelta

Deal found 12/11

$434

Thu 3/55:15 amONT - ATH

3 stops44h 20mAir Canada

Deal found 12/11

$439

Find flight deals from Ontario to Greece

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$490 (oojo)
One-way from	$257 (oojo)
Popular in	December
Cheapest in	November
Average price	$1,091

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. 3% potential increase in price ($30 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($29 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 1/22

6:00 am-12:00 pm

3 stops20h 00m

Athens Eleftherios V.

Mon 1/26

6:25 am-10:53 pm

2 stops26h 28m

$505

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 4/28

11:01 am-7:05 pm

2 stops22h 04m

Athens Eleftherios V.

Tue 5/12

6:30 pm-5:45 pm

2 stops33h 15m

$624

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 1/20

5:05 am-12:00 pm

3 stops20h 55m

Athens Eleftherios V.

Tue 1/27

6:25 am-8:58 pm

3 stops24h 33m

$705

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/20

11:55 am-1:10 am

2 stops27h 15m

Athens Eleftherios V.

Sun 5/3

9:10 am-10:09 pm

1 stop22h 59m

$731

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 1/14

3:09 pm-1:05 am

2 stops23h 56m

Athens Eleftherios V.

Sun 1/18

7:50 pm-5:22 pm

2 stops31h 32m

$781

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 3/23

5:15 am-4:35 pm

2 stops26h 20m

Athens Eleftherios V.

Sun 4/12

2:15 pm-8:46 pm

2 stops40h 31m

$791

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 4/29

1:34 pm-5:40 pm

2 stops18h 06m

Athens Eleftherios V.

Thu 5/7

12:35 pm-10:26 pm

1 stop19h 51m

$808

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 5/16

1:33 pm-2:10 am

2 stops26h 37m

Athens Eleftherios V.

Sun 5/24

8:40 pm-4:32 pm

2 stops29h 52m

$823

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 3/24

3:19 pm-7:30 pm

2 stops19h 11m

Athens Eleftherios V.

Sun 4/12

7:05 am-11:40 pm

2 stops26h 35m

$840

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 4/28

10:59 pm-11:00 am

1 stop26h 01m

Athens Eleftherios V.

Tue 5/12

12:10 pm-10:09 pm

1 stop19h 59m

$893

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 22 results

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 $424). 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?

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

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

9,095 reviews

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

9,095 reviews

United Airlines

7.4

Good

9,095 reviews

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

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. United Airlines provides one of the quickest options available for as low as $505. 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 $424). 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

Top airline flying from Ontario to Greece

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$635	Average$998	FlexibilityNo cancel fee	On-time69%

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$257+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Greece with Cheapflights

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3. Compare prices and book

Cheap flight deals from Ontario to Greece

Cheapest flights from Ontario to GreeceExplore 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 December 12, 2025.

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 December 12, 2025.

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 December 12, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

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.

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?

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 December 12, 2025.

Reviews of airlines servicing Greece

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.

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?

How long is the flight from Ontario to Greece?

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

How can I find direct flights from Ontario to Greece?

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

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

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.

Top airline flying from Ontario to Greece

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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 December 12, 2025.