Cheap flights from Ontario to Rome from $358 ONT → FCO
Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO)
The cheapest return found recently is $795 with Alaska Airlines, 9 May 2027 – 16 May 2027, found yesterday. The cheapest one-way found recently is $358 with Alaska Airlines, 17 Apr 2027, found 2 days ago.
- Cheapest one-way found recently
- $358, found 2 days ago
- Cheapest return found recently
- $795, 9 May 2027 to 16 May 2027
- Usual return price
- $903 to $1,179
- Cheapest month to fly
- March 2027, return fares from $783 found in the last 7 days
Return
The cheapest return fare on each of 9 departure dates is usually $903 to $1,179.
Cheapest return found recently
$795
9 May 2027 – 16 May 2027 · Alaska Airlines
Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO)
Leaves 12:00 p.m. · Return leaves 7:30 a.m. · 36 h 20 min of travel, both ways together
out 1 stop, back 1 stop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$795 9 May 2027 – 16 May 2027found yesterdaySee prices for these dates
$783 1 Mar 2027 – 7 Mar 2027found 5 days agoSee prices for these dates
What have prices looked like?
Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $676 to $812.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 9 departure dates from 23 Dec to 9 Sept 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 7-night return fares leaving within 3 days of 9 May 2027 to compare.
Every date we hold
35 fares on 9 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 23 Dec – 5 Jan 2027 | $1,421 | United Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 1 Mar 2027 – 7 Mar 2027 | $783 | United Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 2 stops, back 1 stop | found 5 days ago | See prices for these dates |
| 19 Mar 2027 – 26 Mar 2027 | $956 | United Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 2 stops, back 1 stop | found 6 days ago | See prices for these dates |
| 30 Apr 2027 – 10 May 2027 | $931 | Alaska Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 9 May 2027 – 16 May 2027 | $795 | Alaska Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
| 21 Jun 2027 – 5 Jul 2027 | $1,179 | Alaska Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 1 Jul 2027 – 8 Jul 2027 | $1,211 | Alaska Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 2 stops | found 2 days ago | See prices for these dates |
| 13 Jul 2027 – 18 Jul 2027 | $1,090 | United Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 9 Sept 2027 – 30 Sept 2027 | $903 | United Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | out 1 stop, back 1 stop | found 7 days ago | See prices for these dates |
Which month looks cheapest?
March 2027 is the cheapest month — from $783.
Airlines on the cheapest dates: United Airlines, Alaska Airlines.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$358
17 Apr 2027 · Alaska Airlines
Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO)
Leaves 4:00 p.m. · 36 h 15 min trip
1 stop
found 2 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$358 17 Apr 2027found 2 days agoOpen this trip
$355 9 Feb 2027found 6 days agoOpen this trip
What have prices looked like?
Over 37 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $349 to $566.
Those were the prices on those days, not today's.
Is this a good one-way price?
Not enough comparable prices yet: we hold one-way fares on 2 departure dates and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 17 Apr 2027 to compare.
Every date we hold
2 fares on 2 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 9 Feb 2027 | $355 | United Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | 2 stops | found 6 days ago | Open this trip |
| 17 Apr 2027 | $358 | Alaska Airlines | Ontario International Airport (ONT) → Leonardo da Vinci-Fiumicino Airport (FCO) | 1 stop | found 2 days ago | Open this trip |
Which month looks cheapest?
February 2027 is the cheapest month — from $355.
Airlines on the cheapest dates: United Airlines, Alaska Airlines.
Premium cabin fares from Ontario to Rome
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 9 May 2027 – 16 May 2027 in another cabin: Premium economy · Business · First
Today's prices for 17 Apr 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to Rome?
Return
Fares 90 to 179 days before departure were typically 11% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $861 | $796 | +13% | 30 |
| 7–13 days | $854 | $709 | +12% | 32 |
| 14–29 days | $803 | $676 | +5% | 39 |
| 30–59 days | $782 | $676 | +3% | 45 |
| 60–89 days | $859 | $738 | +13% | 35 |
| 90–179 days | $762 | $728 | Cheapest seen | 39 |
| 180+ days | $903 | $776 | +19% | 37 |
One-way
Not enough history yet: in 37 days of one-way prices, 24 Sept to 11 Nov, fewer than 3 booking ranges had prices on 7 days or more.
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Los Angeles → Rome
56 km from Ontario
$668
$127 less than flying from Ontario
9 May 2027 – 16 May 2027 · LAX → FCO · out 1 stop, back 1 stop
found 2 days ago
Long Beach → Rome
60 km from Ontario
$1,288
$493 more than flying from Ontario
1 Jul 2027 – 8 Jul 2027 · LGB → FCO · out 1 stop, back 1 stop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Los Angeles → Rome
56 km from Ontario
$308
$50 less than flying from Ontario
24 Nov · LAX → FCO · stops unknown
found 2 days ago
Long Beach → Rome
60 km from Ontario
$418
$60 more than flying from Ontario
17 Apr 2027 · LGB → FCO · 1 stop
found 2 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 9 May 2027 – 16 May 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Ontario to Rome?
The cheapest return found recently is $795 with Alaska Airlines, 9 May 2027 to 16 May 2027, found yesterday. The cheapest return we hold, of any age, is $783 with United Airlines, 1 Mar 2027 to 7 Mar 2027, found 5 days ago. The cheapest return fare on each of 9 departure dates is usually $903 to $1,179.
How much is a one-way flight from Ontario to Rome?
The cheapest one-way found recently is $358 with Alaska Airlines, 17 Apr 2027, found 2 days ago. The cheapest one-way we hold, of any age, is $355 with United Airlines, 9 Feb 2027, found 6 days ago.
What is the cheapest month to fly from Ontario to Rome?
March 2027 is the cheapest month for a return, from $783, 1 Mar 2027 to 7 Mar 2027, found 5 days ago. February 2027 is the cheapest month for a one-way, from $355, 9 Feb 2027, found 6 days ago.
How far ahead should I book a flight from Ontario to Rome?
In 49 days of prices between 24 Sept and 11 Nov, return fares 90 to 179 days before departure were typically 11% lower than 0 to 6 days before departure.
How long is the flight from Ontario to Rome?
The cheapest one-way found recently, with Alaska Airlines on 17 Apr 2027, takes 36 h 15 min with 1 stop.
Which airlines have the cheapest flights from Ontario to Rome?
Between 23 Dec and 9 Sept 2027, United Airlines has the cheapest return on 5 of the 9 departure dates we hold, and Alaska Airlines on 4.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work