ONT - DEN

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ONT — DEN
Oct 4 — Oct 111
Round-trip
1 adult
Economy
0 bags
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Tue 10/4
Tue 10/11

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Good to know

Low season

January

High season

June

Cheapest flight

$40

Average price round-trip

$157

Good deal round-trip

$103

Good deal one-way

$64
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly with an average 23% increase in price.
Flight from Ontario to Denver Intl
(avg. price over the last 2 weeks)
or less
or less

When to book flights from Ontario to Denver Intl

Estimated round-trip price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight from ONT to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $75 or less one-way and $117 or less round-trip.
  • The cheapest flight from Ontario to Denver was found 28 days before departure, on average.
  • Book at least 2 weeks before departure in order to get a below-average price.
  • High season is considered to be May, June and July. The cheapest month to fly is January.
  • On average*, there is no price difference when choosing to fly in the morning or the evening on this flight route.
  • If you are flying out of Ontario Airport (ONT) and need to park, you will find various parking spots. There are long and short-term parking options depending on how long you want to park. The parking stalls are open throughout to every passenger who wishes to park offering the ultimate convenience. They are located in each terminal providing valet, premium, and general parking options.
  • When flying from Ontario Airport (ONT), it is recommended that you arrive at least 2h earlier before your scheduled flight. It is vital to consider the time you will take when checking in at the airport, getting boarding passes, and passing through security checks. Luckily, the Ontario Airport (ONT) waiting time is improving to excellent staffing and screening options.
  • There are multiple power stations in all terminals when you get to Denver International Airport (DEN) and need to work. The stations are well-equipped making it comfortable to work at your convenience.
  • With multiple lounges at Denver International Airport (DEN), passengers can take advantage of the services and refuel when waiting for the next flight or shuttle bus. All the lounges are easily accessible as they are located near passenger departures.
  • If you are having an early morning flight and looking for accommodation, there are various hotels near Ontario Airport (ONT) offering excellent services like free shuttle transfer to the airport. These hotels include Double Tree by Hilton Hotel located 0.9 miles from the airport and Holiday Inn Ontario Airport, which is around 0.7 miles from the airport.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking flights from Ontario to Denver

Top airlines flying Ontario to Denver Intl

Scores according to KAYAK customer reviews
7.0
United AirlinesOverall score based on 70268 reviews
7.4Boarding
7.0Comfort
7.7Crew
6.6Entertainment
6.5Food
Airline reviews
Pros: "The flight was on time and smooth."
Cons: "Too many people with carry on luggage."
Read more about United Airlines
Pros: "The flight was on time and smooth."
Cons: "Too many people with carry on luggage."
Pros: "Wonderful flight.... great crew!"
Pros: "A quick flight between the two cities."
Cons: "After we all boarded the plane, there was an issue to be resolved. This meant we were stuck on the plane, mostly in our seats, for an hour before we took off. This meant there were numerous people on our flight who either missed or had to run to their next flights."
Pros: "The crew was wonderful"
Cons: "My flight was severely delayed."
Pros: "I liked the ticket price."
Cons: "The seat was very narrow with absolutely minimal leg space, and a carry-on bag was not included in the fare."
Pros: "The crew was so polite and helpful."
Cons: "Nothing could be improved for this short flight!"
Cons: "Delta Global Services is the contract company for UA and Delta in MISSOULA. After a great flight to MSO from Denver, we have been sitting in the plane while DGS tried to figure out how to get us off the plane. No management is here to make decisions. Horrible company that is managing United’s flight"
Pros: "The captain was wonderful"
Cons: "The crew were jerks"
Pros: "Fast boarding in good order"
Cons: "Over two hours delayed. Had to carry on carry off my bags that were heavy. Messed up my schedule. Had to incur extra charges at San Diego destination due to the inconvenience."
Pros: "One if the bathrooms was closed and a second one had no running water."
Pros: "Nothing."
Cons: "Delayed flights leading to incredibly tight connection times, staff inconsistent with messaging re the source of the delay, zero compassion for customers, offering $700-$1,400 to get off the plane when you charge $200 to change a flight 2 weeks in advance is especially galling! Will not fly with United again whenever there is a viable alternative to my destination."
Pros: "We were on time and the flights were excellent. Liked the way the pilot and the crew interacted"
Cons: "Our flight was delayed out of Mpls 2 hours so we had to rebook everything since we would miss our connection in Denver to Honolulu. The process of rebooking was terrible -- took almost 2 hours standing in line and the booking agent wasn't knowledgable Had to make an additional stop in LAX and arrived in Honolulu 5 hours later than we were supposed to. VERY disappointing experience all around!"
Pros: "Flight was on-time; no delays; great crew! I also liked the fact there was a person at the gate to let us know where our connecting flight gate was - that was really helpful!"
Cons: "In flight entertainment (archived TV/Movies) not provided (other than through personal electronics); but that didn't bother me - flight between Santa Barbara and Denver isn't that long."
Pros: "Crews were great, customer service was great! Rescheduled several times due to weather."
Cons: "Sitting on the ground at the wrong airport for fuel to wait out the fog in Denver."
Cons: "An hour late which made me have to run to the next gate which is not pleasant for a 70 year old with a bum knee."
Pros: "a little bit more foot-room than my previous flight on a different airline."
Pros: "Someone was sick on the flight while baordjng and it took over an hour for clean up.. we were an hour and a half late. Snacks are ridiculous...really? All the airline can offer is a small bag of mixed pretzels? Think you should offer more choice or larger option for a 4 hour flight."
Pros: "Staff was great, and the few delays that occurred were fairly minimal and it was clear that the staff/pilot did their best to keep things timely"
Cons: "These seats and spaces are incredibly small, my body is so sore! Also the internet costs money? I've travelled with other airlines that include Wi-Fi for free"
Pros: "Nothing. Horrible experience all around. Didn't get home till midnight"
Cons: "Kayak sent me a push notification saying flight was delayed. Arrived at airport, it was scheduled for on time. Airline wouldn't let me or my bag on the flight meaning I had to wait in the airport for 4 hours until the next flight out."
Pros: "On time. Comfortable"
Pros: "Efficient"
Cons: "Bumpy ride"
Pros: "I liked how quick and easy the flight was; from boarding to exiting the plane in SFO."
Cons: "The size of the plane."
Pros: "Upon arrival at my gate departing to Durham with a 2 year old handful. I was excited to hear the attendant call for travelers with small children to board first. The thought of boarding at the same time as everyone else was giving me anxiety."
Cons: "Once I shuffled through tons disgruntled travelers because of my "child privilege" the attendant rolled her eyes and took a deep breath at the amount of time it took me to get to my ticket. Mind you, it makes sense I would have it somewhere convenient, but like I said single traveller, 2 year old handful. She scanned my ticket and flogged her hair in the air telling me take my stuff to the front of the plane. While the other attendant tagged all my items."
Pros: "The crew were pretty quick and responsive and the seats were pretty good."
Cons: "The dinner was alright but the breakfast was awful. The breakfast was the worst I ever had on a flight and the only thing I found edible were the little cookies that came with it. I had the omelette meal and it made me sick taking even one bite of it and the smell was pretty bad too."
Pros: "I didn't fly.I bought the ticket for my son. He had no complaints. You should ask in your questionnaire if the booked flight was for self or someone else."
Cons: "I think United is all about themselves and not the customer that group boarding is the worse and I travel first class and there was no food on the plane they had the nerve to announce it did not get a meal I do not think that is fair for $159 the company that I work for is about fifty of us and I will not be recommending any of them to you guys your special seats is only about who wants to pay for it like I said only about yourself United"
Pros: "This was a short flight. The only issue was the boarding. Took a while for me to get to my seat."
Cons: "TSA took forever, other than that. My flight boards at 0540 and I got there exactly at 0545. The plane already made its way to the runway and wouldn't wait an extra 10 mins for passengers to enter."
Pros: "Flight back was delayed 10 hours and my daughter was stuck at airport and had very little sleep . Upset about this experience and won't fly united ever again"
Pros: "2.5 HR layover lost bag"
Pros: "Nice, big plane"
Cons: "The entertainment went out."
Pros: "The pilots"
Cons: "It's united."
Pros: "Movies were great. Crew was helpful but seemed flustered."
Cons: "Food was terrible for a ten hour flight; I think we all had upset stomachs from it. Passenger next to me was huge and definitely had mansplain going, not cool."
Pros: "Nice plane very smooth flight"
Cons: "Plane was late and missed connection to Wichita"
Pros: "Crew and staff were great!"
Cons: "Flight was delayed over 3 hours so we had to move to next day."
Cons: "I was charged $7 for the TV and it should have been $5 as my flight was less than 2 hours and the TV kept going out."
Pros: "Great staff."
Cons: "A crying baby that say behind me."
Pros: "On time, friendly crew, bags got through timely"
Cons: "Nothing in particular."
Pros: "The crew was nice and boarding went smoothly. I'm glad that they now offer complementary small snacks."
Cons: "I can never get the entertainment to work on my personal device and the seating is always tight in economy class."
Pros: "Flight Attendants were nice."
Cons: "The flight was expensive and they wouldn't let us or anyone place carry ons in the over head bin. It was an expensive ticket and didn't include checked bags ($25 more). Carry-ons wound up being "stowed". It would have been nice to know before I bought the tickets that I needed a smaller carry on."
Pros: "We were upgraded to first class on our connecting flight and my husband and i sat together. That made up for the first flight, because our seating separated us three, which I didn't like."
Cons: "Delayed flight to Denver and our seats were not together."
Pros: "Good flight attendants."
Cons: "Nothing"
Cons: "Super annoying toung boy who kicked my seat and slammed the tray table al ost the entire flight...obviously not United's fault."
Pros: "I liked that 1 out of our four flights had more room & personal tvs."
Cons: "I did not like the fact that out of our four flights three were not too comfortable... & no tvs on three out of four"
Pros: "WiFi was awesome"
Cons: "Wish the TV preview was continuous & pay for movies but watch regular TV work no charge"
Cons: "They crushed my luggage but replaced the carry on after."
Pros: "Got to check 2 carry on pieces for free because too many people had carry on bags. We had paid to check one bag and would have to pick it up anyway, so checking extra pieces was not a problem and actually was very much appreciated."
Cons: "15 minutes late in taking off because an airline associate failed to close out a screen on the computer. It took too long to figure out the problem."
Pros: "The staff was nice"
Cons: "There isn't anything I would say that I didn't like. I just would have to say it was overall a good experience"

Leg room is not great on Frontier for anyone 6 feet tall or taller. One flight attendant snapped at me while I wazwaiting for bathroom

Very efficient always on time. I have flown with Frontier several times and always an excellent experience.

Pros: "Boarding was easy!"
Cons: "Customer service w crew very rude and extremely inappropriate"
Cons: "$4 for a bottle of water, cheap thin uncomfortable seats, tiny space to sit in and the girls at the desk are rude and not helpful! If you want packed planes with no space and thin uncomfortable seats and no drinks or snacks definitely fly here"
Pros: "The crew was reassuring when we were running to board and helped my husband, who had trouble walking."
Pros: "Everything"
Cons: "Don’t charge for food"
Pros: "It was good"
Cons: "All those extra fees even for a drink!!! First time on frontier not sure if I would use it again"
Cons: "Have plane depart on time."
Cons: "The rep. at the baggage drop off was being unnecessarily unkind. Though she did not attend to us, it was obvious to all those in line she was upset. She gave her co-rep. attitude &created a very uncomfortable environment. We do not know either of their names. The negative rep was the AfricanAm lady."
Cons: "Flexibility with the flight."
Pros: "Everything else was fine."
Cons: "The flight was delayed 30 mins prior to boarding for 6 hours. They were missing a part that needed to be ordered. What I don't understand is why they couldn't have emailed everyone to notify us so we weren't stuck in the airport for 6 hours."
Pros: "Early, friendly staff"
Cons: "No WiFi"
Cons: "5 hour delay, horrible last minute communication. Second time in a row this has happened with Frontier. Will never fly them again at any price."
Pros: "Boarding was fast, Polite staff, Very nice crew."
Cons: "Due to all the delays on my first flight I just decided To re-book a different flight back I will never fly with this company again terrible the only reason they get a star because I can’t give them nine terrible"
Pros: "Nothing"
Cons: "Late. Late.Late Staff seemed rude"
Cons: "Three hour delay which almost made me miss my connecting flight. Not even an apology was offered. As we landed my connecting flight was boarding and no attempt was made to deplane the delayed connecting travellers first."
Pros: "Flights was on time."
Cons: "Hidden charges for seats; $45 baggage fee; had to purchase soft drinks; seat didn't recline; had to pay extra for that convenience."
Pros: "The crew were kind and efficient and the planes were clean and well maintained."
Cons: "No entertainment on the flights, but that is to be expected for the price."
Pros: "I liked that there were no issues with my flight I was able to just board , get there and have no problems"
Cons: "I don’t like the fees for everything. It kinda just made me annoyed that there were fees attached to everything that doubled the cost of my flight."
Pros: "We appreciated the cheap airline ticket prices."
Cons: "We were outraged by having to pay $45 for each piece of luggage, including carry ons! After these hidden fees, our tickets would have been cheaper for a well established and popular airline."
Pros: "Quick boarding / deplaning"
Cons: "You have to PAY for a CARRY ON. That's just deceptive so I recommend doing the math when you book your next flight and go for other airlines even if their price is slightly higher than Frontier."
Pros: "The staff was so kind and made the trip fun, very fast flight but so enjoyable. I honestly will not fly another airline if frontier is available. And best of all it was inexpensive... other flights were pushing 500$ and I got this ticket for 200$ overall great experience!!"
Cons: "Only thing was I couldn't buy a drink with cash which is all I had on me but I think that's every airline so nothing frontier specific :)"
Pros: "I lived"
Cons: "definitely would be better if there was USB ports and if I'm gonna spend $7.99 on a shot of whiskey it would at least fill the glass up"
Pros: "It was cheap"
Cons: "I had to find another flight on my own to replace the second leg of my trip from Denver to Salt Lake City. The customer service was ridiculous."
Cons: "Uncomfortable seats - don't recline! Rude crew, create an impression if they're doing you a favor by being there. Flight significantly delayed. No clear announcements. As a frequent flier, didn't expect a Spirit like experience from Frontier!"
Pros: "The cheap price"
Cons: "No complementary drinks such as soda or snacks such as peanuts or pretzels"
Pros: "The staff was friendly."
Cons: "The flight was delayed, and there was poor communication in the waiting area other than making sure your baby item extras were tagged. People with children were told to be ready to board early, but we were the 3rd group to board. I had to pay $3 for my daughter to have juice to drink (no beverage or snack included) after I had to pay extra to get seats assigned to be together with my 3 year old."
Pros: "The flight left 5 hours late, spent a good 30-40 min on the runway, the bagage claim was never marked and announced after most people had figured it out, and they lost two pieces of our luggage. I guess that is good service, since the common standard today is being beaten bloody and dragged off the plane. I wish they had communicated the reasons for the delay, given accurate estimates, etc"
Pros: "Flight crew was good."
Cons: "Everything is an additional charge from having a bag on board to cokes."
Cons: "After being left on the plane for a long time and not even offered ice water or anything. We were released out to the lobby. And then shortly after asked to get back on the plane where it was EXTREMELY Hot. I would NEVER go frontier again."
Cons: "From the get go this flight was terrible. Frontier at DCA doesn't open their ticketing counter until 2 hours before the flight leaves - this means that even though there were 15 people in line, the worker just walked away and left an empty desk after she finished helping the flight before us. The flight attendants were unhelpful and condescending; a man complained because something from the overhead bin was dripping on his head and he received one cocktail napkin in response. They made you pay for sodas (despite me taking this exact flight from DEN to DCA 7 days earlier and getting sodas for free) and overall it was a disappointing experience. I sincerely hope Frontier gets their act together soon, they've become a disappointment of an airline."
Pros: "Absolutely nothing the flight never took off and I never mad it to my destination."
Cons: "Everything this is the worst flying experience I've ever had in my entire life I will never fly frontier again"
Pros: "Fairly good ticket price"
Cons: "Too hot on plane Extra charge for luggage"
Pros: "Flights were overall good. Airplane crew was attentive and cordial- sats are comfortable although not reclineable. Flight was on time and even arrived ahead of schedule"
Cons: "Check in crew was not very cordial/friendly- Did not have any check in Kiosks open at MSY and no one around the dask for over 40 minutes Tried to check in online 12 hours prior to my flight so I could get discounted check in bag prices and it would not accept my email as contact so it would not let me finalize the process so had to pay full price at airport- Although flight arrived early- had to wait almost one hour for luggage"
Pros: "Flight attendants were nice."
Cons: "Flight was late, Boarding procedure was not efficient it would help if they seated by seat letter when I boarded I was in seat f by the window but the other two seats were already occupied and they had to get up to let me in this happened numerous times for everyone on the plan causing a long boarding time. Plane had some off issues I think with the fuel pumps or the hydraulics there was a really annoying sound for the entire flight. No wifi Not enough leg room"
Cons: "Boarding. Why can't airlines go back to the old way of boarding from the rear of the airplane first?"
Pros: "Nothing - the airline is not customer service driven"
Cons: "Have to get checked in 45 minutes before flight. Unreasonable. Over a dozen people stranded with no other flight options from Frontier and staff vanished Not work the low fees when you have to sit at a gate hours before a flight to be guaranteed a seat Fly SWA"
Pros: "Arrived early but then had to sit on tamark to wait for open gate. When able to check in at terminal desk, was able to go through TS-Pre check when I got my ticket."
Cons: "Seats too close together. Crew didn't come through cabin very often to check on passengers or pick up trash. Don't like use card for few dollars of drinks or food. Terminal desk wasn't open when I went to check in 2 hours early. Had difficult time with kiosk. Paying $40 each for carry on both ways and more for a window seat. Flight was delayed from Denver to Madison."
Pros: "Crew was great, plane was on time, boarding easy and prompt."
Cons: "Ticket prices are really good, but since you have to pay for your carry-on baggage and drinks/snacks, you might as well spend an extra $100 on another airline. I will probably not fly Frontier again if I have another choice."
Cons: "Lost all the luggage of the group flying from Portland to Indianapolis through Denver. Simply did not answer the phone number provided for updates on the bags. Took over 24 hours to locate and deliver our bags. Arrived in Indianapolis 1.5 hours late."
Pros: "Service was good."
Cons: "I still didn't receive a $100 voucher that was promise because of the 10 hour flight delay."
Pros: "I liked the timeliness of the boarding process."
Cons: "I did not like the attitude of the one of the male flight attendants and found that he was unprofessional. The seats were the most uncomfortable seats I've had to sit in during a flight. The airline doesn't offer free complimentary drinks and they still don't offer a TSA precheck option for their flights."
Cons: "Swindled at the airport to pay $40 for a carry on, with no heads up during the booking process."
Cons: "I did not realize they charge extra money for a carry-on bag. At that point you have no choice to pay the money. That should be noted up front."
Pros: "I was impressed with how smooth the takeoff and landing were in addition to the kindness of the crew."
Cons: "The hidden charges and random fees got me sweating as they piled up, but nothing too terrible that it actually made flying Frontier more expensive than other airlines."
Cons: "Flight left 45 minutes late with no alerts, uncomfortable planes, tray "tables" couldn't hold more than a deck of cards and a small coffee, nickel and dime for everything, no wifi"
Pros: "Cheap ticket"
Cons: "Paid $130 for a ticket and ended up paying an extra $150 for baggage. Backpack was too big to be considered a Personal Item so $40 for a carry-on. I had tried stuffing into one checked bag so I did not have to pay the extra $40 for a second bag (already paid $35 for the first one). I did not weigh my bag...yeah my fault. Was charged $75 at the counter for overweight fee (61 lbs while 50 lbs is the max). Just be aware of the fees. Also, water is free on flight and everything else is pay."
Pros: "Felt like sardines in a can flying. Didn't k ow ya had to pay for your seats that makes me sad."
Pros: "The crew was nice and the flight was smooth. Can't complain too much about the price, although they try to nickle and dime you for everything (charging you for carry on bags)"
Cons: "They really cram you in there. I'm 6'-1" and basically couldn't move my legs. This is definitely a no-frills airline with no entertainment, power outlets, mediocre snacks, and then they give you a five minute sales pitch about their credit card."

Book cheap flights from Ontario to Denver

Recent round-trip flight deals

10/25Tue
nonstopFrontier
2h 17mONT-DEN
11/1Tue
nonstopFrontier
2h 27mDEN-ONT
$79
11/12Sat
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$81
12/12Mon
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11/7Mon
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11/10Thu
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11/30Wed
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10/29Sat
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10/25Tue
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11/1Tue
nonstopFrontier
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11/4Fri
nonstopFrontier
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2h 18mONT-DEN
$40
10/25Tue
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2h 17mONT-DEN
$41
10/8Sat
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11/22Tue
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10/31Mon
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10/31Mon
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25h 32mONT-DEN
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10/20Thu
2 stopsMultiple Airlines
20h 36mONT-DEN
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10/31Mon
1 stopUnited Airlines
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Ontario - Denver Flights

Departure:

Ontario (ONT)United States

Destination:

Denver (DEN)United States

Return flight deals:

Denver - Ontario

Cabin classes:

$515
$737
$561
$58

Browse origins:

Browse destinations:

$111