Cheap flights from Philadelphia to Ontario from $566 PHL → ONT
Philadelphia International Airport (PHL) → Ontario International Airport (ONT)
The cheapest return found recently is $566 with Frontier Airlines, 27 Dec – 3 Jan 2027, found 2 days ago.
- Cheapest return found recently
- $566, 27 Dec to 3 Jan 2027
- Usual return price
- $509 to $548
Return
The cheapest return fare on each of 3 departure dates is usually $509 to $548.
Cheapest return found recently
$566
27 Dec – 3 Jan 2027 · Frontier Airlines
Philadelphia International Airport (PHL) → Ontario International Airport (ONT)
Leaves 7:52 p.m. · Return leaves 10:48 p.m. · 41 h 38 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
$566 27 Dec – 3 Jan 2027found 2 days agoSee prices for these dates
$489 28 Dec – 3 Jan 2027found 5 days agoSee prices for these dates
What have prices looked like?
Over 38 days, 25 Sept to 11 Nov, the cheapest return we saw each day was $318 to $509.
At $566, the cheapest return found recently is above 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 27 Dec to 30 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 7-night return fares leaving within 3 days of 27 Dec to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 27 Dec – 3 Jan 2027 | $566 | Frontier Airlines | Philadelphia International Airport (PHL) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 28 Dec – 3 Jan 2027 | $489 | Frontier Airlines | Philadelphia International Airport (PHL) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 30 Dec – 3 Jan 2027 | $529 | Frontier Airlines | Philadelphia International Airport (PHL) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
Airlines on the cheapest dates: Frontier Airlines.
Premium cabin fares from Philadelphia to Ontario
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 27 Dec – 3 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Philadelphia to Ontario?
Return
Fares 60 to 89 days before departure were typically 7% lower than 30 to 59 days before departure.
From the cheapest return each day between 25 Sept and 11 Nov (38 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 | $434 | $318 | +7% | 16 |
| 60–89 days | $404 | $318 | Cheapest seen | 25 |
| 90–179 days | $412 | $411 | +2% | 8 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
New York → Ontario
130 km from Philadelphia
$362
$204 less than flying from Philadelphia
6 Apr 2027 – 20 Apr 2027 · JFK → ONT · out 1 stop, back 1 stop
found 2 days ago
Philadelphia → Los Angeles
56 km from Ontario
$447
$119 less than flying to Ontario
22 Jul 2027 – 26 Jul 2027 · PHL → BUR · out 1 stop, back 1 stop
found 3 days ago
Baltimore → Ontario
145 km from Philadelphia
$435
$131 less than flying from Philadelphia
18 Nov – 30 Nov · BWI → ONT · out 1 stop, back 1 stop
found 4 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
New York → Ontario
130 km from Philadelphia
$183
9 Mar 2027 · JFK → ONT · 1 stop
found 2 days ago
Philadelphia → Los Angeles
56 km from Ontario
$390
1 Dec · TTN → LAX · 2 stops
found 4 days ago
Lancaster → Ontario
98 km from Philadelphia
$476
17 Nov · LNS → ONT · 2 stops
found 6 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 27 Dec – 3 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 Philadelphia to Ontario?
The cheapest return found recently is $566 with Frontier Airlines, 27 Dec to 3 Jan 2027, found 2 days ago. The cheapest return we hold, of any age, is $489 with Frontier Airlines, 28 Dec to 3 Jan 2027, found 5 days ago. The cheapest return fare on each of 3 departure dates is usually $509 to $548.
How far ahead should I book a flight from Philadelphia to Ontario?
In 38 days of prices between 25 Sept and 11 Nov, return fares 60 to 89 days before departure were typically 7% lower than 30 to 59 days before departure.
Which airlines have the cheapest flights from Philadelphia to Ontario?
Between 27 Dec and 30 Dec, Frontier Airlines has the cheapest return on all 3 departure dates we hold.
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