Cheap flights from Ontario to Montreal from $520 ONT → YHU, YUL
Ontario International Airport (ONT) → St. Hubert Airport (YHU), Montreal-Pierre Elliott Trudeau International Airport (YUL)
The cheapest return found recently is $520 with United Airlines, 21 Dec – 4 Jan 2027, found 2 days ago.
- Cheapest return found recently
- $520, 21 Dec to 4 Jan 2027
- Usual return price
- $543 to $583
Return
The cheapest return fare on each of 3 departure dates is usually $543 to $583.
Cheapest return found recently
$520
21 Dec – 4 Jan 2027 · United Airlines
Ontario International Airport (ONT) → Montreal-Pierre Elliott Trudeau International Airport (YUL)
Leaves 11:52 p.m. · Return leaves 2:10 p.m. · 17 h 49 min of travel, both ways together
out 1 stop, back 1 stop
found 2 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$520 21 Dec – 4 Jan 2027found 2 days agoSee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 39 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $520 to $801.
At $520, the cheapest return found recently is at the low end of that range.
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 3 departure dates from 16 Dec to 21 Dec, 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 14-night return fares leaving within 3 days of 21 Dec to compare.
Every date we hold
7 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 16 Dec – 3 Jan 2027 | $566 | Frontier Airlines | Ontario International Airport (ONT) → St. Hubert Airport (YHU) | out 2 stops, back 2 stops | found yesterday | See prices for these dates |
| 17 Dec – 4 Jan 2027 | $600 | United Airlines | Ontario International Airport (ONT) → Montreal-Pierre Elliott Trudeau International Airport (YUL) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 21 Dec – 4 Jan 2027 | $520 | United Airlines | Ontario International Airport (ONT) → Montreal-Pierre Elliott Trudeau International Airport (YUL) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
Airlines on the cheapest dates: United Airlines, Frontier Airlines.
Premium cabin fares from Ontario to Montreal
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 21 Dec – 4 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to Montreal?
Return
The cheapest fares were 30 to 59 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (39 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 |
|---|---|---|---|---|
| 30–59 days | $595 | $520 | Cheapest seen | 20 |
| 60–89 days | $655 | $525 | +10% | 32 |
| 90–179 days | $601 | $579 | +1% | 16 |
| 180+ days | $721 | $721 | +21% | 8 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Los Angeles → Montreal
56 km from Ontario
$394
$126 less than flying from Ontario
17 Dec – 4 Jan 2027 · LAX → YUL · out 1 stop, back 1 stop
found yesterday
Palm Springs → Montreal
104 km from Ontario
$602
$82 more than flying from Ontario
1 May 2027 – 4 May 2027 · PSP → YUL · out 1 stop, back 2 stops
found 6 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Palm Springs → Montreal
104 km from Ontario
$292
1 Jun 2027 · PSP → YUL · 1 stop
found 5 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 21 Dec – 4 Jan 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 Montreal?
The cheapest return found recently is $520 with United Airlines, 21 Dec to 4 Jan 2027, found 2 days ago. The cheapest return fare on each of 3 departure dates is usually $543 to $583.
How far ahead should I book a flight from Ontario to Montreal?
In 39 days of prices between 24 Sept and 11 Nov, return fares were cheapest 30 to 59 days before departure.
Which airlines have the cheapest flights from Ontario to Montreal?
Between 16 Dec and 21 Dec, United Airlines has the cheapest return on 2 of the 3 departure dates we hold, and Frontier Airlines on 1.
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