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$720+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
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 July 1, 2025.

Round-trip from

$878
(Iberia)

One-way from

$720
(Air Serbia)

Popular in

December

Cheapest in

June

Average price

$960
From Athens Eleftherios V. to Ontario
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One-way flight from Athens Eleftherios V. to Ontario
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Highest demand for flights based on searches. 0% potential increase in price ($7 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 1, 2025.

This Iberia deal was found by Cheapflights users on 6/30. 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.
Thu 9/2510:55 pmATH - ONT
2 stops29h 59mIberia
Thu 10/98:44 amONT - ATH
2 stops24h 51mIberia
Deal found 6/30$878
This American Airlines deal was found by Cheapflights users on 6/29. 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.
Tue 7/153:55 pmATH - ONT
2 stops30h 01mAmerican Airlines
Sat 7/1910:28 pmONT - ATH
2 stops41h 47mAmerican Airlines
Deal found 6/29$909
This United Airlines deal was found by Cheapflights users on 6/30. 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 7/2412:35 pmATH - ONT
1 stop19h 31mUnited Airlines
Thu 8/75:05 amONT - ATH
2 stops19h 00mUnited Airlines
Deal found 6/30$922
This KLM deal was found by Cheapflights users on 6/29. 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 8/289:10 amATH - ONT
1 stop20h 01mKLM
Wed 9/37:05 amONT - ATH
1 stop16h 55mKLM
Deal found 6/29$933
This flygcity.se deal was found by Cheapflights users on 6/28. 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 flygcity.se is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/135:35 amATH - ONT
2 stops22h 17mBritish Airways
Wed 8/2010:29 pmONT - ATH
1 stop27h 36mBritish Airways
Deal found 6/28$942
This Delta deal was found by Cheapflights users on 6/30. 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 8/219:10 amATH - ONT
1 stop20h 01mDelta
Wed 9/37:05 amONT - ATH
1 stop16h 55mDelta
Deal found 6/30$957
This Ticket deal was found by Cheapflights users on 6/28. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/123:25 amATH - ONT
2 stops28h 55mAir France
Wed 8/2011:45 amONT - ATH
1 stop36h 25mAir France
Deal found 6/28$1,007
This flygcity.se deal was found by Cheapflights users on 6/28. 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 flygcity.se is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1312:10 pmATH - ONT
2 stops20h 42mAir Canada
Wed 8/205:10 amONT - ATH
3 stops22h 50mAir Canada
Deal found 6/28$1,090

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 July 1, 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.

Thu 9/25

10:55 pm-6:54 pm

2 stops29h 59m

Ontario

Thu 10/9

8:44 am-7:35 pm

2 stops24h 51m

$878

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 7/15

3:55 pm-11:56 am

2 stops30h 01m

Ontario

Sat 7/19

10:28 pm-2:15 am

2 stops41h 47m

$909

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 7/24

12:35 pm-10:06 pm

1 stop19h 31m

Ontario

Thu 8/7

5:05 am-10:05 am

2 stops19h 00m

$922

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 8/28

9:10 am-7:11 pm

1 stop20h 01m

Ontario

Wed 9/3

7:05 am-10:00 am

1 stop16h 55m

$933

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 8/13

5:35 am-5:52 pm

2 stops22h 17m

Ontario

Wed 8/20

10:29 pm-12:05 pm

1 stop27h 36m

$942

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 8/21

9:10 am-7:11 pm

1 stop20h 01m

Ontario

Wed 9/3

7:05 am-10:00 am

1 stop16h 55m

$957

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 8/12

3:25 am-10:20 pm

2 stops28h 55m

Ontario

Wed 8/20

11:45 am-10:10 am

1 stop36h 25m

$1,007

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 8/13

12:10 pm-10:52 pm

2 stops20h 42m

Ontario

Wed 8/20

5:10 am-2:00 pm

3 stops22h 50m

$1,090

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 7/28

4:20 pm-9:59 pm

2 stops39h 39m

$720

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sun 8/24

3:55 am-11:59 pm

2 stops30h 04m

$808

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 15 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 $328). 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 July 1, 2025.
Read through reviews of airlines operating flights from Athens to Ontario, such as Delta, KLM, and Air France. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,973 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,366 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.5
Good
1,472 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,858 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • What are the cheapest airlines to fly from Athens to Ontario one-way?

    To fly one-way, consider booking your trip with Air Serbia, which is currently one of the cheapest options available, starting at $720. American Airlines flights start at $830 while deals on British Airways start at $837 one-way.

  • 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 $328). 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 July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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