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$447+ Cheap flights from Athens (ATH) 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Jan 7 — Jan 141
Wed 1/7
Wed 1/14
1 adult, Economy
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Cheap flight deals from Athens to Ontario

Cheapest flights from Athens to Ontario
Explore the most affordable flight options available from Athens to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 8, 2025.

This United Airlines deal was found by Cheapflights users on 12/6. 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 12/266:35 amATH - ONT
2 stops26h 06mUnited Airlines
Tue 2/36:00 amONT - ATH
2 stops33h 40mUnited Airlines
Deal found 12/6$1,046
This United Airlines deal was found by Cheapflights users on 12/6. 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 12/266:35 amATH - ONT
2 stops26h 06mUnited Airlines
Mon 2/26:00 amONT - ATH
2 stops24h 35mUnited Airlines
Deal found 12/6$1,047
This Delta deal was found by Cheapflights users on 12/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:05 amATH - ONT
2 stops23h 45mDelta
Mon 2/26:00 amONT - ATH
2 stops24h 30mDelta
Deal found 12/6$1,068
This American Airlines deal was found by Cheapflights users on 12/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/284:50 pmATH - ONT
2 stops39h 24mMultiple Airlines
Tue 2/33:09 pmONT - ATH
2 stops18h 21mMultiple Airlines
Deal found 12/6$1,541
This Iberia deal was found by Cheapflights users on 12/8. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/243:55 pmATH - ONT
2 stops29h 58mIberia
Mon 6/158:43 amONT - ATH
1 stop16h 57mIberia
Deal found 12/8$1,583
This Qatar Airways deal was found by Cheapflights users on 12/6. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:00 pmATH - ONT
2 stops39h 14mQatar Airways
Mon 2/26:00 amONT - ATH
2 stops43h 10mQatar Airways
Deal found 12/6$1,925
This Qatar Airways deal was found by Cheapflights users on 12/6. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:40 pmATH - ONT
2 stops45h 34mQatar Airways
Mon 2/26:00 amONT - ATH
2 stops43h 10mQatar Airways
Deal found 12/6$1,927
This Qatar Airways deal was found by Cheapflights users on 12/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:00 pmATH - ONT
2 stops38h 29mQatar Airways
Mon 6/811:51 amONT - ATH
2 stops34h 39mQatar Airways
Deal found 12/8$1,971
This Qatar Airways deal was found by Cheapflights users on 12/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:00 pmATH - ONT
2 stops38h 29mQatar Airways
Sat 6/611:51 amONT - ATH
2 stops34h 39mQatar Airways
Deal found 12/8$2,002
This Qatar Airways deal was found by Cheapflights users on 12/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/97:00 pmATH - ONT
2 stops33h 33mQatar Airways
Tue 6/26:00 amONT - ATH
2 stops40h 30mQatar Airways
Deal found 12/8$2,011
This Qatar Airways deal was found by Cheapflights users on 12/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/127:00 pmATH - ONT
2 stops33h 33mQatar Airways
Wed 6/311:51 amONT - ATH
2 stops34h 39mQatar Airways
Deal found 12/8$2,041
This Qatar Airways deal was found by Cheapflights users on 12/8. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/127:00 pmATH - ONT
2 stops33h 33mQatar Airways
Sat 6/66:00 amONT - ATH
2 stops40h 30mQatar Airways
Deal found 12/8$2,071

Find flight deals from Athens to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Athens (ATH) to Ontario (ONT). 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 December 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$926
(Iberia)

One-way from

$447
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$931
Provider with most accurate pricing for Athens Eleftherios V.-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Athens Eleftherios V.-Ontario flights.
Search Deals
From Athens Eleftherios V. to Ontario
Search Deals
One-way flight from Athens Eleftherios V. to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($98 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 Athens 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 8, 2025.
Use the filters below to find and compare flights from Athens to Ontario that are best for you.

Fly from

Athens

Fly to

Ontario

Route

Depart

Return

Price

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 4/7

6:55 am-5:47 pm

2 stops20h 52m

Ontario

Tue 4/14

7:00 am-10:35 am

1 stop17h 35m

$945

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sat 2/21

6:30 am-9:59 pm

2 stops25h 29m

Ontario

Sat 2/28

6:00 am-6:05 pm

2 stops26h 05m

$949

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sat 1/24

6:30 am-5:51 pm

2 stops21h 21m

Ontario

Mon 3/2

1:45 pm-4:35 pm

2 stops16h 50m

$950

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 1/22

6:25 am-10:53 pm

2 stops26h 28m

Ontario

Mon 1/26

6:00 am-4:35 pm

2 stops24h 35m

$950

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 4/15

10:25 am-10:11 pm

2 stops21h 46m

Ontario

Sun 4/19

7:00 am-10:35 am

1 stop17h 35m

$956

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 3/13

12:20 pm-11:35 am

1 stop32h 15m

Ontario

Wed 3/18

10:30 pm-9:55 am

1 stop26h 25m

$979

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 3/13

12:20 pm-11:35 am

1 stop32h 15m

Ontario

Sun 3/15

10:30 pm-9:55 am

1 stop26h 25m

$979

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 4/29

9:10 am-6:15 pm

1 stop19h 05m

Ontario

Thu 5/14

7:00 am-10:00 am

1 stop17h 00m

$979

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sun 3/1

8:00 am-10:04 pm

2 stops24h 04m

$608

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sat 2/28

7:55 am-10:49 pm

2 stops24h 54m

$642

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/6

Showing 1-10 of 19 results
1
2

Compare providers for flights from Athens to Ontario

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 Athens to Ontario in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 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 Athens-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Athens-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Athens-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Athens-Ontario flights, Cheapflights users trust eDreams the most. eDreams 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 Athens-Ontario 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 Athens to Ontario

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

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

Currently, June is the cheapest month in which you can book a flight from Athens to Ontario (average of $368). Flying from Athens 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 8, 2025.
Read through reviews of airlines operating flights from Athens 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
9,076 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

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
9,076 reviews
United Airlines
7.4
Good
9,076 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

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 Athens to Ontario. 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 Athens to Ontario?

    Departing from Athens to Ontario will take you 20h 52m. Airlines will cover a distance of 6879 mi.

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

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

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

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

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

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

    Currently, June is the cheapest month in which you can book a flight from Athens to Ontario (average of $368). Flying from Athens 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

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Athens to Ontario

Discover the top airline that operate flights from Athens 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 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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