Cheap flights from Denver to Ontario (DEN - ONT) from $44

This is the cheapest one-way flight price, found on 5/24. Prices may vary by date and flight preferences.
DEN — ONT
May 30 — Jun 61

The best prices from Denver Intl to Ontario are usually found in January or February, booked 53 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

How to find the cheapest flight from Denver (DEN) to Ontario (ONT)

All the information you need to plan the best DEN to ONT flight in 2023: compare Denver to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.

Popular in

June

Cheapest in

January

Round-trip from

$94

One-way from

$44
High demand for flights, 17% potential price rise
Best time to find cheap flights, 43% potential price drop
From Denver Intl to Ontario
One-way flight from Denver Intl to Ontario

DEN - ONT

Price

$94 - $198

ONT

Temperature

53.6 - 78.8 °F

ONT

Rainfall

0.1 - 3.4 inches

Cheap flights from Denver to Ontario in May, June 2023

The best prices found for DEN to ONT flights for May, June
These are some of the best deals we've found on flights to Ontario in 2023 at this time. For more flight deals, be sure to check back very soon.

Denver to Ontario 2023 flight deals

Cheap flights to Ontario from Denver found for this year
These are some of the best deals we've found on flights to Ontario in 2023 at this time. For more flight deals, be sure to check back very soon.

Cheap Frontier flights from Denver to Ontario

Find some of the cheapest Frontier flights traveling from Denver to Ontario. Come back soon if you're not finding the exact deal you're looking for.
  • One of the most popular airlines traveling from Denver to Ontario is Frontier. Flights from Frontier traveling this route typically cost $300.90 RT. This price is typically 27% cheaper than other airlines that offer Denver to Ontario flights. When booking this route, the cheapest RT price found was $119. Denver Intl Airport is the most common Denver airport to take off from when flying to Ontario. Ontario Airport is the most popular arrival airport in Ontario. When flying from Denver to Ontario, Frontier flights are 9% more popular than any other airline flying that same route.

Cheap Undisclosed Carrier flights from Denver to Ontario

To aid your search, here are some of the cheapest Undisclosed Carrier flights we've found from Denver to Ontario. Deals are refreshing constantly so come back soon for more options.
  • If you’re traveling from Denver to Ontario, one of the more common airlines traveling that route is Undisclosed Carrier. Flights on this route from Undisclosed Carrier typically cost $150.08 RT, a price that is 54% cheaper than the average Denver to Ontario flight. The cheapest flight found was $59 RT. When traveling from Denver to Ontario on Undisclosed Carrier, the most popular airport to depart from is Denver Intl Airport and the most popular airport to arrive at is Ontario Airport. When flying from Denver to Ontario, Undisclosed Carrier flights are -16% more popular than any other airline flying that same route.

Non-stop flights to Ontario from Denver

Save time with Denver to Ontario direct flight deals
If you're seeking options on non-stop flights from Denver to Ontario, check out these fares. Select from other flights from Denver to Ontario by using the search form above.

Last minute flights from Denver to Ontario

Late deals on return flights to Ontario from Denver, departing today and this week
Users seeking a last-minute flight from Denver to Ontario should consider booking one of these fares. It's wise to confirm all flight details are correct before booking.

One-way flights to Ontario from Denver

The cheapest one-way flights from Denver to Ontario
Users traveling one-way from Denver to Ontario can select one of these great deals. Users in need of a round-trip flight from Denver to Ontario instead should update the search form at the top of page.

Find flights from Denver to Ontario within your budget

Use the slider to find flights from Denver to Ontario that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$80 - $108

Route

Depart

Return

Price

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Sat 9/9

Nonstop2h 21m

Ontario

Sat 9/16

Nonstop2h 18m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Sat 9/9

Nonstop2h 21m

Ontario

Fri 9/15

Nonstop2h 22m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Sat 9/9

1 stop5h 00m

Ontario

Fri 9/15

Nonstop2h 22m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Wed 9/27

Nonstop2h 21m

Ontario

Sat 9/30

Nonstop2h 18m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Wed 7/12

Nonstop2h 19m

Ontario

Tue 7/18

Nonstop2h 22m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Mon 8/28

Nonstop2h 19m

Ontario

Wed 8/30

Nonstop2h 22m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Sat 9/23

Nonstop2h 21m

Ontario

Sun 9/24

Nonstop2h 22m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Thu 8/24

Nonstop2h 19m

Ontario

Sat 8/26

Nonstop2h 22m

Denver IntlOntario

DEN - ONT

DENONT

Denver Intl

Sun 10/29

Nonstop2h 24m

Ontario

Mon 11/6

1 stop9h 47m

Flights are sorted by cheapest first

Deals found on 5/24

Reviews of Airlines Servicing Ontario

To help decide which airline to fly from Denver to Ontario, see what other customers have to say about Frontier and Undisclosed Carrier. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.9
Fair
644 reviews

Boarding

6.1

Overall

5.9

Entertainment

4.6

Comfort

5.6

Crew

6.7

Food

4.8

Reviews

1 / 10

boarding process was fast since not a lot of people had roll on luggage. Most people just had personal item. We researched on youtube on the personal item to make sure it would fit. As long as you understand the process and don't expect too much, then you will be at ease. Probably only recommend Frontier for short flights.

Frontier
5.9
Fair
644 reviews
Frontier
5.9
Fair
644 reviews

Boarding

6.1

Overall

5.9

Entertainment

4.6

Comfort

5.6

Crew

6.7

Food

4.8

Reviews

1 / 10

boarding process was fast since not a lot of people had roll on luggage. Most people just had personal item. We researched on youtube on the personal item to make sure it would fit. As long as you understand the process and don't expect too much, then you will be at ease. Probably only recommend Frontier for short flights.

Related info for your journey

Useful info, stats and facts about Denver to Ontario flights.

Alternative routes for Denver to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from Denver to Ontario

The chart below displays the airlines Cheapflights users traveling from Denver to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
FrontierCheapest$59Average$150FlexibilityNo cancel feeOn-time62%COVID-19 safety
Search Frontier flights
DeltaCheapest$92Average$294FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
Spirit AirlinesCheapest$108Average$176FlexibilityNo cancel feeOn-time65%COVID-19 safety
Search Spirit Airlines flights
United AirlinesCheapest$119Average$301FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights
American AirlinesCheapest$215Average$444FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights

Hourly flight availability from Denver to Ontario

See what time of day planes typically take off from Denver to Ontario
7%of flight departuresEarly morningMidnight to 6 am
30%of flight departuresMorning6 am to noon
20%of flight departuresAfternoonNoon to 6 pm
43%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Denver to Ontario

See how many times per day planes take to the skies headed from Denver to Ontario
Sunday11daily flights
Monday10daily flights
Tuesday9daily flights
Wednesday9daily flights
Thursday9daily flights
Friday9daily flights
Saturday8daily flights
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