Ontario to Philadelphia ONT → PHL
Ontario International Airport (ONT) → Philadelphia International Airport (PHL)
The cheapest return found recently is $604 with Frontier Airlines, 30 Oct – 2 Nov, found yesterday.
Return
The cheapest return fare on each of 6 departure dates is usually $377 to $431.
Cheapest return found recently
$604
30 Oct – 2 Nov · Frontier Airlines
Ontario International Airport (ONT) → Philadelphia International Airport (PHL)
Leaves 11:52 a.m. · Return leaves 8:30 a.m. · 28 h 52 min of travel, both ways together
out 2 stops, back 1 stop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$604 30 Oct – 2 Novfound yesterdaySee prices for these dates
$333 6 Nov – 11 Novfound 6 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $228 to $333.
At $604, the cheapest return found recently is above that range.
25 days is a short history, so treat this range as an early guide.
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 6 departure dates from 20 Oct to 31 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 3-night return fares leaving within 3 days of 30 Oct to compare.
Every date we hold
8 fares on 6 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Oct – 26 Oct | $434 | Frontier Airlines | Ontario International Airport (ONT) → Philadelphia International Airport (PHL) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 24 Oct – 27 Oct | $366 | Frontier Airlines | Ontario International Airport (ONT) → Philadelphia International Airport (PHL) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 30 Oct – 2 Nov | $604 | Frontier Airlines | Ontario International Airport (ONT) → Philadelphia International Airport (PHL) | out 2 stops, back 1 stop | found yesterday | See prices for these dates |
| 6 Nov – 11 Nov | $333 | Alaska Airlines | Ontario International Airport (ONT) → Philadelphia International Airport (PHL) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
| 30 Dec – 5 Jan 2027 | $411 | Southwest Airlines | Ontario International Airport (ONT) → Philadelphia International Airport (PHL) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 31 Dec – 6 Jan 2027 | $422 | Southwest Airlines | Ontario International Airport (ONT) → Philadelphia International Airport (PHL) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $333.
Airlines on the cheapest dates: Frontier Airlines, Southwest Airlines, Alaska Airlines.
Premium cabin fares from Ontario to Philadelphia
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 30 Oct – 2 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to Philadelphia?
Return
Fares 14 to 29 days before departure were typically 34% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 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 | $417 | $332 | +51% | 10 |
| 7–13 days | $383 | $332 | +38% | 14 |
| 14–29 days | $277 | $250 | Cheapest seen | 25 |
| 30–59 days | $277 | $228 | +0% | 13 |
| 60–89 days | $411 | $292 | +48% | 7 |
| 90–179 days | $491 | $326 | +77% | 9 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Ontario → New York
130 km from Philadelphia
$355
$249 less than flying to Philadelphia
5 Nov – 17 Nov · ONT → LGA · out 1 stop, back nonstop
found 13 hours ago
Los Angeles → Philadelphia
56 km from Ontario
$393
$211 less than flying from Ontario
30 Oct – 2 Nov · LAX → PHL · out 1 stop, back 1 stop
found yesterday
Ontario → Baltimore
145 km from Philadelphia
$454
$150 less than flying to Philadelphia
25 Oct – 30 Oct · ONT → BWI · out 1 stop, back 1 stop
found yesterday
Long Beach → Philadelphia
60 km from Ontario
$597
$7 less than flying from Ontario
30 Oct – 2 Nov · LGB → PHL · out 1 stop, back 1 stop
found yesterday
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Ontario → New York
130 km from Philadelphia
$117
5 Dec · ONT → LGA · stops unknown
found today
Ontario → Baltimore
145 km from Philadelphia
$222
21 Jan 2027 · ONT → BWI · 1 stop
found 3 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 30 Oct – 2 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
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