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$365+ Cheap flights from Ontario (ONT) to Athens (ATH)

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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
May 24 — May 311
Sun 5/24
Sun 5/31
1 adult, Economy
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Cheap flight deals from Ontario to Athens

Cheapest flights from Ontario to Athens
Explore the most affordable flight options available from Ontario to Athens. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 24, 2026.

This United Airlines deal was found by Cheapflights users on 4/19. 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 10/47:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Tue 10/2012:35 pm
ATH
-
ONT
1 stop19h 51m
United Airlines
Deal found 4/19$814
This oojo deal was found by Cheapflights users on 4/22. 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 8/257:06 am
ONT
-
ATH
1 stop18h 39m
British Airways
Wed 9/22:00 pm
ATH
-
ONT
1 stop18h 58m
British Airways
Deal found 4/22$815
This oojo deal was found by Cheapflights users on 4/24. 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 8/267:06 am
ONT
-
ATH
1 stop18h 39m
British Airways
Fri 9/42:00 pm
ATH
-
ONT
1 stop29h 34m
British Airways
Deal found 4/24$821
This Expedia deal was found by Cheapflights users on 4/19. 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.
Mon 9/77:06 am
ONT
-
ATH
1 stop18h 39m
Iberia
Wed 9/166:55 am
ATH
-
ONT
2 stops26h 11m
Iberia
Deal found 4/19$838
This United Airlines deal was found by Cheapflights users on 4/21. 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 9/277:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Thu 10/1512:35 pm
ATH
-
ONT
1 stop19h 51m
United Airlines
Deal found 4/21$844
This British Airways deal was found by Cheapflights users on 4/19. 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 9/284:59 pm
ONT
-
ATH
2 stops23h 11m
British Airways
Mon 10/58:50 pm
ATH
-
ONT
2 stops34h 18m
British Airways
Deal found 4/19$847
This United Airlines deal was found by Cheapflights users on 4/22. 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 10/101:49 pm
ONT
-
ATH
2 stops34h 46m
United Airlines
Thu 10/2210:25 am
ATH
-
ONT
2 stops20h 27m
United Airlines
Deal found 4/22$849
This Gotogate deal was found by Cheapflights users on 4/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/712:59 pm
ONT
-
ATH
2 stops27h 11m
British Airways
Wed 9/164:15 pm
ATH
-
ONT
2 stops39h 22m
British Airways
Deal found 4/19$855
This United Airlines deal was found by Cheapflights users on 4/22. 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 10/1211:20 am
ONT
-
ATH
2 stops21h 20m
United Airlines
Thu 10/2210:25 am
ATH
-
ONT
2 stops20h 27m
United Airlines
Deal found 4/22$857
This Air Canada deal was found by Cheapflights users on 4/22. 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.
Tue 8/257:00 am
ONT
-
ATH
2 stops17h 10m
Multiple Airlines
Wed 9/212:10 pm
ATH
-
ONT
2 stops19h 49m
Multiple Airlines
Deal found 4/22$864
This oojo deal was found by Cheapflights users on 4/19. 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 8/2111:59 pm
ONT
-
ATH
1 stop25h 46m
British Airways
Fri 9/42:00 pm
ATH
-
ONT
1 stop29h 34m
British Airways
Deal found 4/19$871
This oojo deal was found by Cheapflights users on 4/24. 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 11/44:47 pm
ONT
-
ATH
2 stops22h 18m
British Airways
Wed 11/118:20 pm
ATH
-
ONT
2 stops35h 39m
British Airways
Deal found 4/24$875

Find flight deals from Ontario to Athens

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Athens (ATH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$814
(United Airlines)

One-way from

$365
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$796
Provider with most accurate pricing for Ontario-Athens Eleftherios V. flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Athens Eleftherios V. flights.
Search Deals
From Ontario to Athens Eleftherios V.
Search Deals
One-way flight from Ontario to Athens Eleftherios V.
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($240 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($56 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 Athens 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 24, 2026.
Use the filters below to find and compare flights from Ontario to Athens that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 5/5

6:00 am-2:55 pm

2 stops22h 55m

Athens Eleftherios V.

Thu 5/14

12:35 pm-10:35 pm

1 stop20h 00m

$982
Quickest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 5/4

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 5/21

9:45 am-6:36 pm

1 stop18h 51m

$1,060

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 5/5

10:15 pm-11:00 am

1 stop26h 45m

Athens Eleftherios V.

Thu 5/14

9:45 am-6:36 pm

1 stop18h 51m

$1,060

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 8/31

7:06 am-11:45 am

1 stop18h 39m

Athens Eleftherios V.

Mon 9/7

2:00 pm-10:58 pm

1 stop18h 58m

$1,115

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 5/7

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 5/14

9:45 am-6:36 pm

1 stop18h 51m

$1,120

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 6/8

7:00 am-11:45 am

1 stop18h 45m

Athens Eleftherios V.

Thu 9/3

12:00 pm-10:04 pm

1 stop20h 04m

$1,155

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 8/2

11:50 pm-3:45 pm

2 stops29h 55m

Athens Eleftherios V.

Thu 8/13

2:10 pm-10:35 pm

2 stops42h 25m

$1,330

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 7/11

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Sun 7/19

11:30 am-9:44 pm

1 stop20h 14m

$1,341

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 6/22

11:54 pm-6:15 pm

2 stops32h 21m

Athens Eleftherios V.

Sat 9/26

4:30 pm-8:13 pm

2 stops61h 43m

$1,382

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 6/2

10:41 pm-6:15 pm

2 stops33h 34m

Athens Eleftherios V.

Fri 6/12

4:30 am-10:38 pm

2 stops28h 08m

$1,411

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/19

Showing 1-10 of 22 resultsSorted by cheapest first
1
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3

Compare providers for flights from Ontario to Athens

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Athens in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Athens flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Athens flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Athens flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Athens flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Athens flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Athens

Have a flexible travel schedule? Discover the best time to fly to Athens 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 Athens

How much does it cost to fly round-trip from Ontario to Athens?

Reviews of airlines servicing Athens

Get insights into the airlines that provide service to Athens. 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 Athens. Reviews last updated April 24, 2026.
Read reviews from past customers who have flown United Airlines from Ontario to Athens. 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
9,643 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

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
9,643 reviews
United Airlines
7.4
Good
9,643 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

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 Athens. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Athens?

    Airlines like KLM, United Airlines, and Air Serbia fly from Ontario to Athens in about 17h 55m. The time it takes to get you to your destination can typically vary by up to 14h 26m. Ontario and Athens are separated by a distance of 6879 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Ontario to Athens round-trip?

    According to our current data, United Airlines ($588), offers the cheapest pricing from Ontario to Athens. United Airlines is priced at 28% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Athens by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Athens?

Book flights to Athens if you plan to visit one of these locations
Glyfada
Tolo
Piraeus
Galaxidi

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Top airline flying from Ontario to Athens

Discover the top airline that operate flights from Ontario to Athens. 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 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$823FlexibilityNo cancel feeOn-time69%

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