Cheap flights from San Antonio to Ontario from $153 SAT → ONT
San Antonio International Airport (SAT) → Ontario International Airport (ONT)
The cheapest return found recently is $266 with Frontier Airlines, 7 Feb 2027 – 9 Feb 2027, found yesterday. The cheapest one-way found recently is $153 with Frontier Airlines, 7 Jan 2027, found yesterday.
- Cheapest one-way found recently
- $153, Frontier Airlines, found yesterday
- Cheapest return found recently
- $266, 7 Feb 2027 to 9 Feb 2027
- Cheapest month to fly
- December 2026, return fares from $217 found in the last 7 days
Return
Not enough comparable prices yet for a usual return price.
Cheapest return found recently
$266
7 Feb 2027 – 9 Feb 2027 · Frontier Airlines
San Antonio International Airport (SAT) → Ontario International Airport (ONT)
Leaves 8:20 p.m. · Return leaves 6:09 a.m. · 27 h 19 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
$266 7 Feb 2027 – 9 Feb 2027found yesterdaySee prices for these dates
$217 5 Dec – 9 Decfound 5 days agoSee prices for these dates
What have prices looked like?
Over 26 days, 25 Sept to 12 Nov, the cheapest return we saw each day was $217 to $440.
26 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?
Not enough comparable prices yet: we hold return fares on 2 departure dates and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other 2-night return fares leaving within 3 days of 7 Feb 2027 to compare.
Every date we hold
4 fares on 2 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 5 Dec – 9 Dec | $217 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 7 Feb 2027 – 9 Feb 2027 | $266 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $217.
Airlines on the cheapest dates: Frontier Airlines.
One-way
The cheapest one-way fare on each of 8 departure dates is usually $154 to $272.
Cheapest one-way found recently
$153
7 Jan 2027 · Frontier Airlines
San Antonio International Airport (SAT) → Ontario International Airport (ONT)
Leaves 8:24 p.m. · 5 h 51 min trip
1 stop · via Denver International Airport (DEN)
found yesterday
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$153 7 Jan 2027found yesterdayOpen this trip
$152 4 Decfound 2 days agoOpen this trip
What have prices looked like?
Over 44 days, 24 Sept to 12 Nov, the cheapest one-way we saw each day was $100 to $241.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 8 departure dates from 21 Nov to 21 May 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 one-way fares leaving within 3 days of 7 Jan 2027 to compare.
Every date we hold
17 fares on 8 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 21 Nov | $158 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found 3 days ago | Open this trip |
| 4 Dec | $152 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found 2 days ago | Open this trip |
| 7 Jan 2027 | $153 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found yesterday | Open this trip |
| 11 Jan 2027 | $155 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found yesterday | Open this trip |
| 13 Feb 2027 | $162 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found yesterday | Open this trip |
| 18 Mar 2027 | $297 | United Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found yesterday | Open this trip |
| 6 May 2027 | $272 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found yesterday | Open this trip |
| 21 May 2027 | $272 | Frontier Airlines | San Antonio International Airport (SAT) → Ontario International Airport (ONT) | 1 stop | found yesterday | Open this trip |
Which month looks cheapest?
December 2026 is the cheapest month — from $152.
Airlines on the cheapest dates: Frontier Airlines, United Airlines.
Premium cabin fares from San Antonio 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 7 Feb 2027 – 9 Feb 2027 in another cabin: Premium economy · Business · First
Today's prices for 7 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Antonio to Ontario?
Return
Not enough history yet: in 26 days of return prices, 25 Sept to 12 Nov, fewer than 3 booking ranges had prices on 7 days or more.
One-way
Fares 30 to 59 days before departure were typically 49% lower than 7 to 13 days before departure.
From the cheapest one-way each day between 24 Sept and 12 Nov (44 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 |
|---|---|---|---|---|
| 7–13 days | $197 | $158 | +97% | 11 |
| 14–29 days | $113 | $100 | +13% | 26 |
| 30–59 days | $100 | $100 | Cheapest seen | 10 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Austin → Ontario
118 km from San Antonio
$210
$56 less than flying from San Antonio
6 Feb 2027 – 9 Feb 2027 · AUS → ONT · out 1 stop, back 1 stop
found 3 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Austin → Ontario
118 km from San Antonio
$90
$63 less than flying from San Antonio
5 Dec · AUS → ONT · 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 7 Feb 2027 – 9 Feb 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 San Antonio to Ontario?
The cheapest return found recently is $266 with Frontier Airlines, 7 Feb 2027 to 9 Feb 2027, found yesterday. The cheapest return we hold, of any age, is $217 with Frontier Airlines, 5 Dec to 9 Dec, found 5 days ago.
How much is a one-way flight from San Antonio to Ontario?
The cheapest one-way found recently is $153 with Frontier Airlines, 7 Jan 2027, found yesterday. The cheapest one-way we hold, of any age, is $152 with Frontier Airlines, 4 Dec, found 2 days ago. The cheapest one-way fare on each of 8 departure dates is usually $154 to $272.
What is the cheapest month to fly from San Antonio to Ontario?
December 2026 is the cheapest month for a return, from $217, 5 Dec to 9 Dec, found 5 days ago. It is the cheapest month for a one-way too, from $152, 4 Dec, found 2 days ago.
How far ahead should I book a flight from San Antonio to Ontario?
In 44 days of prices between 24 Sept and 12 Nov, one-way fares 30 to 59 days before departure were typically 49% lower than 7 to 13 days before departure.
How long is the flight from San Antonio to Ontario?
The cheapest one-way found recently, with Frontier Airlines on 7 Jan 2027, takes 5 h 51 min with 1 stop.
Which airlines have the cheapest flights from San Antonio to Ontario?
Between 21 Nov and 21 May 2027, Frontier Airlines has the cheapest one-way on 7 of the 8 departure dates we hold, and United 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