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Cheap Frontier Flight Deals to Ontario

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip Frontier flight deals to Ontario

Thu, Sep 17 - Fri, Sep 18
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
12:07 pm - 1:43 pmONT  Ontario-SFO San Francisco
1h 36mnonstop
$59Frontier
Fri, Sep 11 - Sun, Sep 13
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
12:07 pm - 1:43 pmONT  Ontario-SFO San Francisco
1h 36mnonstop
$68Frontier
Fri, Sep 18 - Mon, Sep 28
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
12:07 pm - 1:43 pmONT  Ontario-SFO San Francisco
1h 36mnonstop
$73Frontier
Thu, Sep 24 - Mon, Sep 28
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
12:07 pm - 1:43 pmONT  Ontario-SFO San Francisco
1h 36mnonstop
$78Frontier
Fri, Sep 25 - Mon, Sep 28
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
12:07 pm - 1:43 pmONT  Ontario-SFO San Francisco
1h 36mnonstop
$79Frontier
Thu, Sep 17 - Tue, Sep 22
Frontier Logo
9:05 am - 10:30 amDEN  Denver Intl-ONT Ontario
2h 25mnonstop
Frontier Logo
11:45 am - 3:07 pmONT  Ontario-DEN Denver Intl
2h 22mnonstop
$82Frontier
Thu, Sep 24 - Tue, Oct 20
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
11:26 am - 6:25 pmONT  Ontario-SFO San Francisco
6h 59m1 stop Las Vegas Harry Reid Intl
$83Frontier
Thu, Oct 1 - Tue, Oct 6
Frontier Logo
9:05 am - 10:30 amDEN  Denver Intl-ONT Ontario
2h 25mnonstop
Frontier Logo
11:45 am - 3:07 pmONT  Ontario-DEN Denver Intl
2h 22mnonstop
$83Frontier
Thu, Oct 1 - Wed, Oct 7
Frontier Logo
6:02 pm - 7:36 pmSFO  San Francisco-ONT Ontario
1h 34mnonstop
Frontier Logo
2:30 pm - 6:24 pmONT  Ontario-SFO San Francisco
3h 54m1 stop Las Vegas Harry Reid Intl
$86Frontier
Sat, Oct 17 - Mon, Oct 19
Frontier Logo
9:01 am - 10:29 amDEN  Denver Intl-ONT Ontario
2h 28mnonstop
Frontier Logo
6:15 am - 9:41 amONT  Ontario-DEN Denver Intl
2h 26mnonstop
$87Frontier
Useful Info

KAYAK's insights & trends for Ontario flights with Frontier

Get data-powered insights and trends into Frontier flights to Ontario to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly with Frontier to Ontario?

The cheapest month for Frontier flights to Ontario is September, where tickets cost $162 (return) on average. On the other hand, the most expensive months to fly this route on Frontier are July and June, where the average cost of round-trip tickets is $297 and $277 respectively.

How far in advance should I book Frontier flights to Ontario?

For the absolute cheapest price on Frontier, our data suggests you should book 4 weeks before departure.

What is the cheapest flight to Ontario with Frontier?

The cheapest airline ticket to Ontario from the United States with Frontier in the last 5 days was $33 one-way, and $82 round-trip on the route from Denver to Ontario. The most popular route is from Denver to Ontario and the cheapest ticket found on this route in the last 5 days was $82 return.

How many direct flights does Frontier operate to Ontario every week?

Each week there are around 61 direct flights from within the United States to Ontario. The most common day for departures is Monday, with 16% of flights taking off on this day.

What is the cheapest day to fly to Ontario?

Based on KAYAK data, the cheapest day to fly to Ontario is Thursday where tickets can be as cheap as $217. On the other hand, the most expensive day to fly is Saturday, where prices are $248 on average.

What is the cheapest time of day to fly to Ontario with Frontier?

The cheapest time of day to fly to Ontario with Frontier is generally in the evening, when flights cost $176 on average.

Good to know

Low season

February

Cheapest flight

$33

Average price round-trip

$354

Good deal round-trip

$301
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Denver to Ontario
(avg. price over the last 2 weeks)
or less

When to book flights with Frontier to Ontario

Average price per month
Flight prices as travel date approaches

FAQs for flying to Ontario with Frontier

  • Is Frontier cheaper than other airlines flying to Ontario?

    With an average return price of $332, Frontier is cheaper than JetBlue when it comes to flights to Ontario. However, the cheapest airline flying to Ontario is United Airlines, with an average return price of $226.

  • Which other airlines fly to Ontario?

    Along with Frontier, you can also fly to Ontario with Delta, Southwest, Alaska Airlines, American Airlines, United Airlines, JetBlue, JetBlue and United Airlines.

  • How much is a flight to Ontario with Frontier?

    On average, Frontier flights to Ontario cost $332 for a round-trip.

  • Which airport do Frontier flights to Ontario fly into?

    You’ll fly into Ontario Airport when flying to Ontario with Frontier.

Top tips for your flights to Ontario with Frontier

  • The cheapest flight to Ontario with Frontier found on KAYAK in the last 2 weeks departed from Las Vegas and cost $138.
  • If you’re intending to fly with Frontier, book your flight to Ontario at least 1 week before departure to ensure a below-average price.
  • High season for flights to Ontario with Frontier is November and prices are highest at this time. The cheapest month to fly is February.

Frontier customer reviews

5.6
Fair2,628 verified ratings
5.4Comfort
6.5Crew
4.5Food
5.9Boarding
4.2Entertainment
Traveler rating:
Sort by:
K
2.0 Poor
Sat in the airport waiting for my flight for 5 hours. Finally got on the plane only to be thrown off and told that my flight was cancelled. Zero customer service. Nobody spoke to us. Just the worst
J
2.0 Poor
3+ hour delay on a direct flight is never ideal.
A
2.0 Poor
When I was boarding my departure from Raleigh to Orlando I was inappropriately scolded by a female dog named Mia because I didn’t pay in advance for my carry on bag ($75). Frontiers website is confusing regarding pre-paying for carryons so it was a simple mistake. I also had paid for “upfront plus” meaning me and my son were seated in the front row with no one in the middle seat ($450 upgrade). When we were boarding Mia said “sir, you didn’t pay for your carryon” in a not so polite tone and told me to get out of line and come back to the counter to pay for my carryon. The way they had the retractable rope left me no room to circle back without making the people behind me move so I just stood there and then she said a second time “sir!! Go pay for your carryon” in an embarrassing tone. I then moved their rope so I could get back to the counter when a second female dog then asked “are you done!?!?” because I had said “do you want me to bulldoze the people behind me?” I then said you do realize I paid over $400 for upfront plus so I was certainly not trying to sneak a carryon bag without paying. Long story short, I am soooo done with discount airlines!!! By the time you pay for all the “extras” you might as well have paid for Delta Southwest or American! Frontier airlines sucks and I was embarrassed by a female dog named Mia!!!
W
4.0 Mediocre
No reclining seats
A
8.0 Very good
Friendly service. No charges for phones.
N
8.0 Very good
Great services
A
2.0 Poor
They cancelled my flight
J
10.0 Wonderful
Frontier is good until they cancel your flight. Way too many cancellations.
G
2.0 Poor
See my last review
G
4.0 Mediocre
I know Frontier is a “no-frills” airline. I understand the concept. However, I jumped on some tickets for our family vacation, expecting to play a bit of a game to figure out the family bags and not over spend. In the end, I got the short end of this deal by far. 1. I did not expect them to charge the baggage fee for each direction. It makes the fee look high-ish at a glance, but reasonable. Then when you get to checkout and realize you have to pay it twice to come home with your luggage, it becomes ridiculous. 2. The low checked bag weight limit. I am used to packing a 50lb bag with my preferred airline. Frontier’s artificially low 40lb limit more quickly triggers the extra weight fee, which almost DOUBLES the price of the bag if you go over ($79 for the bag/$75 for the next 10 lbs) 3. The fee for a carry-on bag is the same as a checked bag but with a lower size and weight limit. Make it make sense! 4. The seats are terrible. My 2.5 hour flight almost had me losing my mind. I’m 6’3” and my femurs barely fit in the space provided. My knees had to wiggle just right to jam into the crack next to the armrest of the seat in front of me. The cushioning was thin and inadequate. I am tall but I’m not a freak. These seats are unacceptable. 5. I overheard the woman next to me speaking with the gate agent about being charged a $25 fee for not checking in online - she checked in at the airport counter when she arrived. That’s ridiculous. She was old and in a wheelchair. She had a paper boarding pass, and was obviously not tech savvy. She should not be punished for that. 6. They do not have good placement in the terminals. It was always out on the end or down on a subfloor, and we had to walk out on the tarmac almost every time. In Denver. Their home airport! 7. Every time I loaded a new page on the website while buying my tickets or my bags, it was constantly trying to upsell me on some esoteric bundle. Like, a pop-up every time. Very annoying. 8. No screens in the boarding area (at least where we were) to confirm you’re in the right place. Just static gate number signs. I am sure these are standard practices for Frontier, and I should have read more about them before I purchased tickets, but as a result of this single round trip, I do not plan to ever use this cut-rate airline again. I would rather pay the normal amount for a ticket and be treated like a customer instead of a mark.
Read more about Frontier

Everything you need to know for your flight to Ontario

Other airlines flying to Ontario

United Airlines flights to Ontario
Alaska Airlines flights to Ontario
American Airlines flights to Ontario
Delta flights to Ontario
Southwest flights to Ontario