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$340+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
FCO — ONT
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
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 January 26, 2026.

This United Airlines deal was found by Cheapflights users on 1/25. 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 3/37:05 am
FCO
-
ONT
2 stops22h 45m
United Airlines
Thu 4/306:59 pm
ONT
-
FCO
1 stop33h 21m
United Airlines
Deal found 1/25$601
This United Airlines deal was found by Cheapflights users on 1/25. 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 2/107:05 am
FCO
-
ONT
2 stops19h 38m
United Airlines
Tue 2/175:00 am
ONT
-
FCO
2 stops19h 25m
United Airlines
Deal found 1/25$604
This lol.travel deal was found by Cheapflights users on 1/25. 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.
Wed 4/11:10 pm
FCO
-
ONT
1 stop18h 20m
British Airways
Wed 4/1510:59 am
ONT
-
FCO
1 stop16h 06m
British Airways
Deal found 1/25$612
This United Airlines deal was found by Cheapflights users on 1/25. 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 2/510:30 am
FCO
-
ONT
2 stops44h 28m
United Airlines
Sun 2/86:39 pm
ONT
-
FCO
2 stops52h 51m
United Airlines
Deal found 1/25$618
This Air Canada deal was found by Cheapflights users on 1/25. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/1411:15 am
FCO
-
ONT
2 stops34h 28m
Air Canada
Sat 3/71:50 pm
ONT
-
FCO
2 stops33h 05m
Air Canada
Deal found 1/25$624
This United Airlines deal was found by Cheapflights users on 1/26. 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 4/76:50 am
FCO
-
ONT
2 stops20h 12m
United Airlines
Tue 4/147:00 am
ONT
-
FCO
1 stop15h 55m
United Airlines
Deal found 1/26$631
This United Airlines deal was found by Cheapflights users on 1/25. 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 4/16:50 am
FCO
-
ONT
2 stops24h 55m
United Airlines
Tue 4/146:05 am
ONT
-
FCO
2 stops17h 10m
United Airlines
Deal found 1/25$632
This British Airways deal was found by Cheapflights users on 1/25. 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.
Wed 4/221:10 pm
FCO
-
ONT
1 stop18h 25m
British Airways
Mon 5/410:59 am
ONT
-
FCO
1 stop16h 06m
British Airways
Deal found 1/25$641
This United Airlines deal was found by Cheapflights users on 1/24. 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 4/259:45 am
FCO
-
ONT
1 stop21h 41m
United Airlines
Mon 4/271:27 pm
ONT
-
FCO
1 stop14h 53m
United Airlines
Deal found 1/24$645
This United Airlines deal was found by Cheapflights users on 1/26. 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 3/167:05 am
FCO
-
ONT
2 stops18h 36m
United Airlines
Sun 3/2911:05 am
ONT
-
FCO
1 stop17h 15m
United Airlines
Deal found 1/26$652
This United Airlines deal was found by Cheapflights users on 1/25. 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 2/19:40 am
FCO
-
ONT
2 stops22h 13m
United Airlines
Sun 2/85:05 am
ONT
-
FCO
2 stops19h 20m
United Airlines
Deal found 1/25$655

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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$601
(United Airlines)

One-way from

$340
(CheapTickets.ch)

Popular in

July

Cheapest in

November

Average price

$600
Provider with most accurate pricing for Rome Fiumicino-Ontario flight deals.
Search Deals
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. 12% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 26, 2026.
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 4/2

1:10 pm-11:59 pm

1 stop19h 49m

Ontario

Thu 4/9

10:59 am-12:05 pm

1 stop16h 06m

$612

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Tue 3/31

2:20 pm-8:36 pm

1 stop15h 16m

Ontario

Mon 4/13

7:00 am-7:55 am

1 stop15h 55m

$618

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Thu 2/5

10:30 am-9:58 pm

2 stops44h 28m

Ontario

Sun 2/8

6:39 pm-8:30 am

2 stops52h 51m

$618

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Sat 2/14

11:15 am-12:43 pm

2 stops34h 28m

Ontario

Sat 3/7

1:50 pm-7:55 am

2 stops33h 05m

$624

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Wed 4/1

6:50 am-10:45 pm

2 stops24h 55m

Ontario

Tue 4/14

6:05 am-8:15 am

2 stops17h 10m

$632

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Wed 4/22

1:10 pm-10:35 pm

1 stop18h 25m

Ontario

Mon 5/4

10:59 am-12:05 pm

1 stop16h 06m

$641

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Fri 4/3

3:40 pm-10:45 pm

1 stop16h 05m

Ontario

Mon 4/6

1:27 pm-1:20 pm

1 stop14h 53m

$645

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Sat 4/25

9:45 am-10:26 pm

1 stop21h 41m

Ontario

Sat 5/2

10:43 am-1:20 pm

1 stop17h 37m

$645

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Fri 4/3

2:20 pm-8:36 pm

1 stop15h 16m

Ontario

Fri 4/10

1:27 pm-1:20 pm

1 stop14h 53m

$648

RomeOntario

FCO - ONT

FCOONT

Rome Fiumicino

Mon 4/20

1:10 pm-11:46 pm

1 stop19h 36m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 21 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, November is the cheapest month in which you can book a flight from Rome Fiumicino Airport to Ontario (average of $351). Flying from Rome Fiumicino Airport to Ontario in July is currently the most expensive (average of $667). 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 $618, British Airways can have you in Ontario from Rome Fiumicino Airport in 15h 16m. 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, November is the cheapest month in which you can book a flight from Rome Fiumicino Airport to Ontario (average of $351). Flying from Rome Fiumicino Airport to Ontario in July is currently the most expensive (average of $667). 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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