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Ontario

$478+ 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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap 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 September 17, 2025.

Round-trip from

$832
(United Airlines)

One-way from

$478
(Kiwi.com)

Popular in

October

Cheapest in

September

Average price

$550
From Athens Eleftherios V. to Ontario
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One-way flight from Athens Eleftherios V. to Ontario
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High demand for flights, 3% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/15. 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 12/116:25 amATH - ONT
2 stops24h 17mUnited Airlines
Sat 1/101:20 pmONT - ATH
2 stops17h 15mUnited Airlines
Deal found 9/15$832
This United Airlines deal was found by Cheapflights users on 9/15. 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 10/110:25 amATH - ONT
2 stops20h 59mUnited Airlines
Sun 10/56:27 pmONT - ATH
2 stops27h 43mUnited Airlines
Deal found 9/15$833
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/24:00 pmATH - ONT
2 stops39h 24mUnited Airlines
Mon 10/66:27 pmONT - ATH
2 stops27h 43mUnited Airlines
Deal found 9/16$834
This American Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 10/88:05 pmATH - ONT
2 stops32h 57mAmerican Airlines
Wed 10/1510:57 amONT - ATH
2 stops21h 58mAmerican Airlines
Deal found 9/17$836
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/110:25 amATH - ONT
2 stops22h 27mUnited Airlines
Wed 10/86:00 amONT - ATH
2 stops17h 55mUnited Airlines
Deal found 9/17$839
This lol.travel deal was found by Cheapflights users on 9/14. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/37:05 amATH - ONT
2 stops39h 32mUnited Airlines
Sun 11/167:00 amONT - ATH
2 stops32h 40mUnited Airlines
Deal found 9/14$880
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/11:40 pmATH - ONT
2 stops31h 02mDelta
Sun 10/57:05 amONT - ATH
1 stop17h 50mDelta
Deal found 9/15$927
This Delta deal was found by Cheapflights users on 9/16. 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 10/26:00 amATH - ONT
2 stops21h 00mDelta
Mon 10/67:05 amONT - ATH
1 stop17h 50mDelta
Deal found 9/16$928
This Delta deal was found by Cheapflights users on 9/17. 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.
Wed 10/86:00 amATH - ONT
2 stops19h 53mDelta
Wed 10/157:05 amONT - ATH
1 stop17h 50mDelta
Deal found 9/17$933
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 12/166:25 amATH - ONT
3 stops26h 24mUnited Airlines
Thu 12/251:40 pmONT - ATH
2 stops17h 55mUnited Airlines
Deal found 9/16$958
This United Airlines deal was found by Cheapflights users on 9/16. 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 12/1512:50 pmATH - ONT
2 stops19h 59mUnited Airlines
Thu 12/251:40 pmONT - ATH
2 stops17h 55mUnited Airlines
Deal found 9/16$971
This United Airlines deal was found by Cheapflights users on 9/16. 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 12/112:50 pmATH - ONT
2 stops20h 01mUnited Airlines
Mon 12/151:34 pmONT - ATH
2 stops17h 01mUnited Airlines
Deal found 9/16$1,009

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 September 17, 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.

Sun 12/14

6:15 am-8:42 pm

2 stops24h 27m

Ontario

Sat 1/10

1:20 pm-4:35 pm

2 stops17h 15m

$832

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 10/1

10:25 am-9:24 pm

2 stops20h 59m

Ontario

Sun 10/5

6:27 pm-8:10 am

2 stops27h 43m

$833

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 10/2

4:00 pm-9:24 pm

2 stops39h 24m

Ontario

Mon 10/6

6:27 pm-8:10 am

2 stops27h 43m

$834

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 10/1

10:25 am-10:52 pm

2 stops22h 27m

Ontario

Wed 10/8

6:00 am-9:55 am

2 stops17h 55m

$839

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 11/3

7:05 am-12:37 pm

2 stops39h 32m

Ontario

Sun 11/16

7:00 am-1:40 am

2 stops32h 40m

$880

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 10/1

1:40 pm-10:42 am

2 stops31h 02m

Ontario

Sun 10/5

7:05 am-10:55 am

1 stop17h 50m

$927

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 10/8

6:00 am-3:53 pm

2 stops19h 53m

Ontario

Wed 10/15

7:05 am-10:55 am

1 stop17h 50m

$933

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 12/16

6:25 am-10:49 pm

3 stops26h 24m

Ontario

Thu 12/25

1:40 pm-5:35 pm

2 stops17h 55m

$958

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 12/15

12:50 pm-10:49 pm

2 stops19h 59m

Ontario

Thu 12/25

1:40 pm-5:35 pm

2 stops17h 55m

$971

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 10/2

10:30 am-10:23 pm

1 stop21h 53m

Ontario

Mon 10/6

11:36 am-10:55 am

1 stop37h 19m

$1,015

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 22 results
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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, August is the cheapest month in which you can book a flight from Athens to Ontario (average of $246). Flying from Athens to Ontario in March is currently the most expensive (average of $327). 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 September 17, 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
8,926 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
8,926 reviews
United Airlines
7.4
Good
8,926 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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 24h 27m. 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, August is the cheapest month in which you can book a flight from Athens to Ontario (average of $246). Flying from Athens to Ontario in March is currently the most expensive (average of $327). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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