Find cheap Frontier flights to Ontario
CMH — ONT
Aug 26 — Sep 21
Round-trip
1 adult, Economy
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Cheapest Frontier flights from USA to OntarioExplore the most affordable Frontier flight options available from USA to Ontario. Find the lowest fares with prices last updated on July 27, 2026.
Explore the most affordable Frontier flight options available from USA to Ontario. Find the lowest fares with prices last updated on July 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/23![Frontier logo]()
$62
This Frontier deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/263:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/23![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/299:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Mon 8/318:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/26![Frontier logo]()
$69
Best Frontier flights from USA to OntarioDiscover carefully curated Frontier flight deals from USA to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 27, 2026.
Discover carefully curated Frontier flight deals from USA to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 27, 2026.
This Booking.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/59:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Sun 9/68:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/27![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/179:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Fri 8/218:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/27![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/229:05 am
DEN
- ONT
Nonstop2h 25m
Frontier
Sat 9/266:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Deal found 7/27![Frontier logo]()
$122
Direct Frontier flights from USA to OntarioExplore non-stop Frontier flight options from USA to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated July 27, 2026.
Explore non-stop Frontier flight options from USA to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated July 27, 2026.
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1412:31 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Mon 9/2811:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 7/24![Frontier logo]()
$57
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Mon 9/1412:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Deal found 7/26![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Mon 9/1412:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Deal found 7/24![Frontier logo]()
$59
Last-minute Frontier flights from USA to OntarioDiscover last-minute Frontier flight deals from USA to Ontario. Data last updated July 27, 2026 and is based on user searches.
Discover last-minute Frontier flight deals from USA to Ontario. Data last updated July 27, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/23![Frontier logo]()
$62
This Frontier deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/263:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/23![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/299:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Mon 8/318:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/26![Frontier logo]()
$69
One-way Frontier flights to OntarioSearch for one-way Frontier flight options to Ontario. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
Search for one-way Frontier flight options to Ontario. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
This eDestinos deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2210:29 pm
DEN
- ONT
Nonstop2h 21m
Frontier
Deal found 7/24![Frontier logo]()
$27
This Super.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/912:11 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/23![Frontier logo]()
$33
This Super.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3110:29 pm
DEN
- ONT
Nonstop2h 21m
Frontier
Deal found 7/26![Frontier logo]()
$33
Flights to Ontario with Frontier at a glance
Find detailed information about Frontier flights from USA to Ontario. Explore the options provided by Frontier to plan your journey from USA to Ontario. Data last updated July 27, 2026.
Cheapflights Insights
Find cheap Frontier flights to Ontario
US0-ONT
SFO-ONT
DEN-ONT
How long is the flight to Ontario with Frontier?
On average, Frontier flights from the United States to Ontario take 3 hours 20 minutes. Flights to Ontario from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.
Frontier weekly flight availability to Ontario
The most flights to Ontario operated by Frontier are scheduled on a Monday (9 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (8 on average).
When is the best time to book a flight to Ontario with Frontier?
The best time to book a flight to Ontario with Frontier is 42 days before departure. On average, fares are higher if you book on the same day as departure.
When is the cheapest time to fly to Ontario with Frontier?
Users looking for the cheapest Frontier fares to Ontario should consider flying on Saturday evenings, when prices are typically cheapest. Budget-minded travellers will want to avoid Saturday at noon, when prices are usually at their highest.
FAQs about flights to Ontario with Frontier
Reviews of Frontier
See what Cheapflights users have to say about their Frontier experience.
Overview
Reviews
Frontier
2,753 reviews
Overview
Comfort
5.4
Entertainment
4.3
Crew
6.6
Food
4.5
Boarding
5.9
Recent reviews
10.0
|Jul 2026Better Food and there was no entertainment . You guys could provide head phones and wifi for the passengers
2.0
|Jul 2026Flight delayed 3 hours
6.0
|Jun 2026Nothing. Needs better seat. Need atleast water. Need wifi
4.0
|Jun 2026The flight was delayed about 3hours
2.0
|Jun 2026I paid extra for seating upfront but was very cramped and had to wait for other passengers to unboard even though I paid for seating upfront front to unboard first. Reason being they were probably not going to make their connecting flights because we had to wait an hour and a half for an open gate. I had to wait on the tarmac for as long as the flight itself took. It was a horrible experience and not only should I receive a refund for my upgrade, but I should receive a refund for the entire flight. I plan on sending a formal complaint as well as letting friends and family know that frontier is a horrible choice. It is by far a better option to pay a bit more and use a different airline. My opinion may be changed if something is done to earn my business once more. Otherwise I have nothing positive to say about my experience.
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