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$601+ 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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ATH — ONT
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
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 February 11, 2026.

This United Airlines deal was found by Cheapflights users on 2/9. 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 4/156:45 am
ATH
-
ONT
2 stops21h 02m
United Airlines
Tue 4/217:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 2/9$959
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Fri 2/276:05 am
ATH
-
ONT
2 stops24h 02m
United Airlines
Tue 5/57:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Deal found 2/10$964
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Thu 2/266:25 am
ATH
-
ONT
2 stops24h 25m
United Airlines
Mon 3/26:37 pm
ONT
-
ATH
2 stops21h 03m
United Airlines
Deal found 2/10$968
This United Airlines deal was found by Cheapflights users on 2/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:05 am
ATH
-
ONT
2 stops21h 36m
United Airlines
Thu 3/56:37 pm
ONT
-
ATH
2 stops21h 03m
United Airlines
Deal found 2/11$970
This American Airlines deal was found by Cheapflights users on 2/9. 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.
Fri 3/67:45 am
ATH
-
ONT
2 stops26h 14m
American Airlines
Mon 3/92:39 pm
ONT
-
ATH
2 stops19h 16m
American Airlines
Deal found 2/9$975
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Fri 3/612:25 pm
ATH
-
ONT
2 stops34h 23m
United Airlines
Mon 3/911:59 pm
ONT
-
ATH
2 stops24h 06m
United Airlines
Deal found 2/10$976
This Tripair deal was found by Cheapflights users on 2/9. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/149:10 am
ATH
-
ONT
1 stop21h 50m
Multiple Airlines
Wed 4/2210:15 pm
ONT
-
ATH
1 stop26h 45m
Multiple Airlines
Deal found 2/9$987
This Tripair deal was found by Cheapflights users on 2/8. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/245:20 pm
ATH
-
ONT
2 stops32h 42m
KLM
Sat 2/2810:20 pm
ONT
-
ATH
2 stops28h 40m
KLM
Deal found 2/8$998
This Tripair deal was found by Cheapflights users on 2/9. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/29:45 am
ATH
-
ONT
1 stop21h 15m
Multiple Airlines
Wed 4/155:05 pm
ONT
-
ATH
2 stops22h 10m
Multiple Airlines
Deal found 2/9$1,000

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 February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$959
(United Airlines)

One-way from

$601
(Cheapflightsfares)

Popular in

January

Cheapest in

September

Average price

$832
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 ($99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 11, 2026.
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 4/28

6:45 am-6:02 pm

2 stops21h 17m

Ontario

Tue 5/5

7:00 am-10:35 am

1 stop17h 35m

$959

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Wed 4/15

6:45 am-5:47 pm

2 stops21h 02m

Ontario

Tue 4/21

7:00 am-10:35 am

1 stop17h 35m

$959

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 2/27

6:05 am-5:41 pm

2 stops21h 36m

Ontario

Sat 5/2

7:00 am-10:35 am

1 stop17h 35m

$964

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 3/2

6:25 am-5:41 pm

2 stops21h 16m

Ontario

Tue 5/5

7:00 am-10:35 am

1 stop17h 35m

$964

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 2/27

6:05 am-8:07 pm

2 stops24h 02m

Ontario

Tue 5/5

7:00 am-10:35 am

1 stop17h 35m

$964

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Mon 3/2

6:25 am-8:50 pm

2 stops24h 25m

Ontario

Sat 5/2

7:00 am-10:35 am

1 stop17h 35m

$964

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Tue 3/3

6:25 am-8:50 pm

2 stops24h 25m

Ontario

Tue 5/5

7:00 am-10:35 am

1 stop17h 35m

$964

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Sun 3/1

2:00 pm-10:57 pm

2 stops18h 57m

Ontario

Tue 5/5

7:00 am-10:35 am

1 stop17h 35m

$964

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Fri 2/27

6:05 am-8:07 pm

2 stops24h 02m

Ontario

Mon 3/2

6:37 pm-1:40 am

2 stops21h 03m

$968

AthensOntario

ATH - ONT

ATHONT

Athens Eleftherios V.

Thu 2/26

6:25 am-8:50 pm

2 stops24h 25m

Ontario

Mon 3/2

6:37 pm-1:40 am

2 stops21h 03m

$968

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

Showing 1-10 of 22 results
1
2
3
  • Most accurate provider: When it comes to deals on Athens-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Athens-Ontario flight deals on Cheapflights vs. FlightHub >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 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 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 $326). Flying from Athens to Ontario in October is currently the most expensive (average of $832). 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 February 11, 2026.
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
9,269 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Boarding

7.7

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
9,269 reviews
United Airlines
7.4
Good
9,269 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Boarding

7.7

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 21h 17m. 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 $326). Flying from Athens to Ontario in October is currently the most expensive (average of $832). 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 February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$913Average$1,037FlexibilityNo cancel feeOn-time69%

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