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$491+ Cheap flights from Fiumicino (FCO) 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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
FCO — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap flight deals from Leonardo da Vinci/Fiumicino to Ontario

Cheapest flights from Leonardo da Vinci/Fiumicino to Ontario
Explore the most affordable flight options available from Leonardo da Vinci/Fiumicino to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/9. 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 12/247:00 amFCO - ONT
2 stops38h 38mUnited Airlines
Wed 1/75:05 amONT - FCO
2 stops42h 25mUnited Airlines
Deal found 12/9$795
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Sun 12/2111:00 amFCO - ONT
2 stops43h 07mUnited Airlines
Thu 1/85:05 amONT - FCO
2 stops18h 25mUnited Airlines
Deal found 12/9$800
This Finnair deal was found by Cheapflights users on 12/10. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/191:10 pmFCO - ONT
1 stop18h 04mMultiple Airlines
Thu 1/110:50 amONT - FCO
1 stop14h 55mMultiple Airlines
Deal found 12/10$801
This Finnair deal was found by Cheapflights users on 12/10. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/231:10 pmFCO - ONT
1 stop18h 04mMultiple Airlines
Thu 1/110:50 amONT - FCO
1 stop14h 55mMultiple Airlines
Deal found 12/10$809
This American Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/241:10 pmFCO - ONT
1 stop31h 43mAmerican Airlines
Wed 1/73:09 pmONT - FCO
2 stops36h 31mAmerican Airlines
Deal found 12/9$814
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Fri 12/269:45 amFCO - ONT
2 stops21h 56mUnited Airlines
Wed 1/71:24 pmONT - FCO
2 stops34h 06mUnited Airlines
Deal found 12/9$817
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Tue 12/231:30 pmFCO - ONT
2 stops29h 31mUnited Airlines
Wed 1/71:24 pmONT - FCO
2 stops34h 06mUnited Airlines
Deal found 12/9$856
This Finnair deal was found by Cheapflights users on 12/10. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/151:10 pmFCO - ONT
1 stop18h 18mMultiple Airlines
Wed 12/2410:50 amONT - FCO
1 stop14h 55mMultiple Airlines
Deal found 12/10$870
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Sat 12/2011:00 amFCO - ONT
2 stops43h 07mUnited Airlines
Sat 1/35:05 amONT - FCO
2 stops42h 25mUnited Airlines
Deal found 12/9$875
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/1611:00 amFCO - ONT
2 stops31h 54mAmerican Airlines
Tue 2/37:16 amONT - FCO
2 stops20h 24mAmerican Airlines
Deal found 12/11$897
This Delta deal was found by Cheapflights users on 12/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:10 amFCO - ONT
2 stops19h 58mDelta
Wed 1/712:41 pmONT - FCO
1 stop36h 49mDelta
Deal found 12/9$915
This Finnair deal was found by Cheapflights users on 12/9. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/231:10 pmFCO - ONT
1 stop29h 28mMultiple Airlines
Mon 1/57:10 amONT - FCO
2 stops16h 50mMultiple Airlines
Deal found 12/9$940

Find flight deals from Leonardo da Vinci/Fiumicino to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Leonardo da Vinci/Fiumicino (FCO) 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 12, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$624
(American Airlines)

One-way from

$491
(Finnair)

Popular in

January

Cheapest in

November

Average price

$796
Provider with most accurate pricing for Rome Fiumicino-Ontario flight deals.
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Provider most trusted by Cheapflights users for Rome Fiumicino-Ontario flights.
Search Deals
From Rome Fiumicino to Ontario
Search Deals
One-way flight from Rome Fiumicino to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($89 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Leonardo da Vinci/Fiumicino 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 12, 2025.
Use the filters below to find and compare flights from Rome Fiumicino Airport to Ontario that are best for you.

Fly from

Leonardo da Vinci/Fiumicino

Fly to

Ontario

Route

Depart

Return

Price

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Thu 3/5

1:10 pm-6:39 pm

2 stops38h 29m

Ontario

Mon 3/9

2:47 pm-9:55 pm

2 stops23h 08m

$625

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Wed 3/11

11:35 am-10:30 pm

1 stop18h 55m

Ontario

Wed 3/18

10:56 am-10:35 am

1 stop15h 39m

$637

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Thu 3/5

9:40 am-8:50 pm

2 stops20h 10m

Ontario

Mon 3/9

11:59 pm-7:45 am

1 stop23h 46m

$783

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Thu 1/15

7:05 am-10:53 pm

2 stops24h 48m

Ontario

Sat 1/24

5:05 am-7:55 am

2 stops17h 50m

$784

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Thu 12/25

12:20 pm-12:38 pm

2 stops33h 18m

Ontario

Tue 1/6

1:24 pm-8:30 am

2 stops58h 06m

$795

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Wed 12/24

7:00 am-12:38 pm

2 stops38h 38m

Ontario

Sat 1/3

5:05 am-8:30 am

2 stops42h 25m

$795

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Thu 12/25

12:20 pm-12:38 pm

2 stops33h 18m

Ontario

Sat 1/3

5:05 am-8:30 am

2 stops42h 25m

$795

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Sun 12/21

11:00 am-9:07 pm

2 stops43h 07m

Ontario

Thu 1/8

5:05 am-8:30 am

2 stops18h 25m

$800

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Sun 12/21

11:00 am-9:07 pm

2 stops43h 07m

Ontario

Tue 1/6

1:24 pm-8:30 am

2 stops58h 06m

$800

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Tue 6/9

3:40 pm-11:06 pm

1 stop16h 26m

Ontario

Tue 6/23

1:00 pm-12:20 pm

1 stop14h 20m

$800

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 24 results
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  • Most accurate provider: When it comes to deals on Rome Fiumicino Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Rome Fiumicino Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Rome Fiumicino Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Rome Fiumicino Airport-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 Rome Fiumicino Airport-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 Leonardo da Vinci/Fiumicino to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Leonardo da Vinci/Fiumicino 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 Rome Fiumicino Airport to Ontario

What is the cheapest month to book a flight from Rome Fiumicino Airport to Ontario?

Currently, September is the cheapest month in which you can book a flight from Rome Fiumicino Airport to Ontario (average of $350). Flying from Rome Fiumicino Airport to Ontario in July is currently the most expensive (average of $668). 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.

Related info for your journey

Find useful and relevant information for your journey from Leonardo da Vinci/Fiumicino to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Rome Fiumicino?

    If you book a flight to Ontario from Rome Fiumicino, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Rome Fiumicino to Ontario per day from 0 different airlines.

  • How long is the flight from Rome Fiumicino Airport to Ontario?

    For as low as $783, American Airlines can have you in Ontario from Rome Fiumicino Airport in 20h 10m. The distance from Rome Fiumicino Airport to Ontario is about 6303 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Leonardo da Vinci/Fiumicino to Ontario that include hotel bookings?

    Yes. In addition to deals on Leonardo da Vinci/Fiumicino to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Leonardo da Vinci/Fiumicino to Ontario?

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

  • Can I find deals for business class flights from Leonardo da Vinci/Fiumicino to Ontario?

    Yes. Cheapflights offers flight deals from Leonardo da Vinci/Fiumicino 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 Rome Fiumicino Airport to Ontario?

    Currently, September is the cheapest month in which you can book a flight from Rome Fiumicino Airport to Ontario (average of $350). Flying from Rome Fiumicino Airport to Ontario in July is currently the most expensive (average of $668). 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.

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