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$703+ 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 6/17. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$820
(British Airways)

One-way from

$703
(Air Serbia)

Popular in

December

Cheapest in

June

Average price

$785
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 June 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 June 12, 2025.

This lol.travel deal was found by Cheapflights users on 6/12. 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.
Fri 6/273:25 pmATH - ONT
2 stops40h 13mMultiple Airlines
Sat 7/122:37 pmONT - ATH
2 stops24h 18mMultiple Airlines
Deal found 6/12$799
This American Airlines deal was found by Cheapflights users on 6/10. 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 10/75:40 pmATH - ONT
2 stops34h 13mAmerican Airlines
Fri 10/2411:59 pmONT - ATH
2 stops40h 11mAmerican Airlines
Deal found 6/10$818
This British Airways deal was found by Cheapflights users on 6/10. 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.
Tue 6/247:55 amATH - ONT
2 stops23h 43mBritish Airways
Tue 7/14:50 pmONT - ATH
2 stops23h 20mBritish Airways
Deal found 6/10$820
This Iberia deal was found by Cheapflights users on 6/10. 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 9/310:35 pmATH - ONT
2 stops30h 19mIberia
Mon 9/2212:47 pmONT - ATH
2 stops40h 23mIberia
Deal found 6/10$881
This United Airlines deal was found by Cheapflights users on 6/10. 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 7/212:10 pmATH - ONT
2 stops20h 42mUnited Airlines
Fri 10/106:37 pmONT - ATH
2 stops29h 28mUnited Airlines
Deal found 6/10$888
This Delta deal was found by Cheapflights users on 6/10. 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.
Fri 9/56:00 amATH - ONT
2 stops20h 08mDelta
Fri 9/1910:59 pmONT - ATH
1 stop25h 01mDelta
Deal found 6/10$909
This KLM deal was found by Cheapflights users on 6/10. 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 9/49:10 amATH - ONT
1 stop20h 01mKLM
Sat 9/207:00 amONT - ATH
1 stop17h 00mKLM
Deal found 6/10$911
This Air Serbia deal was found by Cheapflights users on 6/11. 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 Serbia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/24:20 amATH - ONT
2 stops28h 10mAir Serbia
Mon 9/1510:56 pmONT - ATH
2 stops29h 59mAir Serbia
Deal found 6/11$1,115

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 June 12, 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.

Fri 6/27

3:25 pm-9:38 pm

2 stops40h 13m

Ontario

Sat 7/12

2:37 pm-12:55 am

2 stops24h 18m

$799

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 10/7

5:40 pm-5:53 pm

2 stops34h 13m

Ontario

Fri 10/24

11:59 pm-2:10 am

2 stops40h 11m

$818

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 6/24

7:55 am-9:38 pm

2 stops23h 43m

Ontario

Tue 7/1

4:50 pm-2:10 am

2 stops23h 20m

$820

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 9/3

10:35 pm-6:54 pm

2 stops30h 19m

Ontario

Mon 9/22

12:47 pm-3:10 pm

2 stops40h 23m

$881

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 7/2

12:10 pm-10:52 pm

2 stops20h 42m

Ontario

Fri 10/10

6:37 pm-10:05 am

2 stops29h 28m

$888

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 9/5

6:00 am-4:08 pm

2 stops20h 08m

Ontario

Fri 9/19

10:59 pm-10:00 am

1 stop25h 01m

$909

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 9/4

9:10 am-7:11 pm

1 stop20h 01m

Ontario

Sat 9/20

7:00 am-10:00 am

1 stop17h 00m

$911

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 9/2

4:20 am-10:30 pm

2 stops28h 10m

Ontario

Mon 9/15

10:56 pm-2:55 pm

2 stops29h 59m

$1,115

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 6/17

4:20 am-9:59 pm

2 stops27h 39m

$703

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 11/3

1:00 pm-11:45 pm

2 stops20h 45m

$802

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 19 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 June 12, 2025.
Get a feel of what it's like to fly with Delta, KLM and Qatar Airways from Athens to Ontario by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

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
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

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
1,358 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

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
Qatar Airways
7.4
Good
3,584 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

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
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

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
7,946 reviews

Crew

8.5

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

7.9

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 $703. American Airlines flights start at $809 while deals on Iberia start at $844 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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