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Aurora

$79+ Cheap flights from Ontario (ONT) to Aurora, CO

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DEN
May 1 — May 81
Fri 5/1
Fri 5/8
1 adult, Economy
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Find cheap flights from Ontario to Aurora with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Ontario to Aurora are usually found in September or February, booked 51 days in advance, depart on a Friday or Thursday and return on a Saturday

Cheap flight deals from Ontario to Aurora

Cheapest flights from Ontario to Aurora
Explore the most affordable flight options available from Ontario to Aurora. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 1, 2026.

This Frontier deal was found by Cheapflights users on 3/28. 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 5/126:00 am
ONT
-
DEN
Nonstop2h 22m
Frontier
Tue 5/198:41 am
DEN
-
ONT
Nonstop2h 24m
Frontier
Deal found 3/28$89
This Frontier deal was found by Cheapflights users on 3/30. 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.
Wed 4/2912:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Sat 5/210:29 pm
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/30$90
This Super.com deal was found by Cheapflights users on 3/30. 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.
Sun 4/2612:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Mon 5/46:05 am
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/30$91
This Cheapflightsfares deal was found by Cheapflights users on 3/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1912:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Mon 4/206:05 am
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/29$92
This Super.com deal was found by Cheapflights users on 3/31. 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 4/165:33 pm
ONT
-
DEN
Nonstop2h 25m
Frontier
Sun 4/196:00 am
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/31$93
This Cheapflightsfares deal was found by Cheapflights users on 3/31. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Sun 4/266:00 am
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/31$94
This Trip.com deal was found by Cheapflights users on 3/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
-
DEN
Nonstop2h 22m
Frontier
Tue 5/268:41 am
DEN
-
ONT
Nonstop2h 24m
Frontier
Deal found 3/29$95
This Super.com deal was found by Cheapflights users on 3/30. 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.
Wed 4/1512:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Mon 4/206:05 am
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/30$98
This Frontier deal was found by Cheapflights users on 3/28. 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.
Wed 4/1512:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Sat 4/2510:29 pm
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/28$99
This Frontier deal was found by Cheapflights users on 3/28. 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.
Fri 4/1712:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Mon 4/273:53 pm
DEN
-
ONT
1 stop8h 50m
Frontier
Deal found 3/28$100
This Cheapflightsfares deal was found by Cheapflights users on 3/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/112:59 am
ONT
-
DEN
Nonstop2h 16m
Frontier
Mon 5/46:05 am
DEN
-
ONT
Nonstop2h 26m
Frontier
Deal found 3/28$102

Find flight deals from Ontario to Aurora

Keep the following information in mind while searching for Ontario to Aurora flight deals. Data was last updated April 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$89
(Frontier)

One-way from

$79
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$171
Provider with most accurate pricing for Los Angeles Los Angeles-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles Los Angeles-Denver Intl flights.
Search Deals
From Ontario to Aurora
Search Deals
One-way flight from Ontario to Aurora
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Aurora that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 1, 2026.
Use the filters below to find and compare flights from Ontario to Aurora that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 5/4

1:55 pm-7:15 pm

1 stop4h 20m

Denver Intl

Tue 5/12

6:45 am-11:35 am

2 stops5h 50m

$224

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Fri 5/1

3:00 pm-8:45 pm

1 stop4h 45m

Denver Intl

Tue 5/5

6:45 am-11:35 am

2 stops5h 50m

$253

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sat 5/2

10:15 am-4:45 pm

2 stops5h 30m

Denver Intl

Tue 5/19

2:05 pm-6:55 pm

2 stops5h 50m

$269

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 4/14

5:05 pm-10:29 pm

1 stop4h 24m

Denver Intl

Mon 4/20

6:27 pm-11:44 pm

1 stop6h 17m

$278

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sat 4/25

1:34 pm-4:56 pm

Nonstop2h 22m

Denver Intl

Mon 4/27

7:10 pm-8:36 pm

Nonstop2h 26m

$280

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 4/15

6:00 am-11:32 am

1 stop4h 32m

Denver Intl

Wed 4/22

6:27 pm-11:44 pm

1 stop6h 17m

$300

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Thu 5/21

1:18 pm-4:38 pm

Nonstop2h 20m

Denver Intl

Tue 5/26

4:05 pm-5:28 pm

Nonstop2h 23m

$318

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 4/27

3:55 pm-11:05 pm

1 stop6h 10m

Denver Intl

Mon 5/4

11:05 am-4:25 pm

2 stops6h 20m

$326

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 5/12

5:00 am-8:22 am

Nonstop2h 22m

Denver Intl

Fri 5/15

11:15 am-12:38 pm

Nonstop2h 23m

$341

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 4/15

1:34 pm-4:56 pm

Nonstop2h 22m

Denver Intl

Sat 4/18

11:15 am-12:38 pm

Nonstop2h 23m

$397

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Ontario to Aurora

Have a flexible travel schedule? Discover the best time to fly to Aurora from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Aurora

How far ahead should I book a flight from Ontario to Aurora?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Aurora. Price data was last updated on March 13, 2026.

The best time to book flights from Ontario to Aurora is 51 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ontario to Aurora?

Currently, August is the cheapest month in which you can book a flight from Ontario to Aurora (average of $45). Flying from Ontario to Aurora in March is currently the most expensive (average of $77). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to 9UR?

Find hourly flight availability from Ontario to Aurora. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 1, 2026.

It’s optimal to fly from Ontario to Aurora in the evening. By choosing this option you can save up to 51% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Ontario to Aurora?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Aurora. Price data was last updated on March 28, 2026.

Travelers seeking maximum savings on their Ontario to Aurora flight should consider departing on Friday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Ontario to Aurora

Explore weekly flight availability from Ontario to Aurora. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 1, 2026.

The most flights from ONT to 9UR are scheduled on a Monday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost to fly round-trip from Ontario to Aurora?

Reviews of airlines servicing Aurora

Get insights into the airlines that provide service to Aurora. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Aurora. Reviews last updated April 1, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andFrontier from Ontario to Aurora to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,337 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,337 reviews
Southwest
8.0
Very good
4,337 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,535 reviews
Southwest
8.0
Very good
4,337 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,004 reviews
Southwest
8.0
Very good
4,337 reviews

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Ontario to Aurora. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Aurora?

    If you book a flight to Aurora from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 6 flights from Ontario to Aurora per day from 4 different airlines.

  • How popular is this Ontario to Aurora flight route?

    The Ontario to Aurora flight path was viewed by 294 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Aurora?

    Southwest, Delta, and United Airlines can get you from Ontario to Aurora in just under 2h 22m. Your travel time can differ by up to 2h 02m. Ontario and Aurora are separated by a distance of 817 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Ontario to Aurora one-way?

    $40 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Southwest, with prices starting from $78 and $78, respectively.

  • What are the most reliable airlines from Ontario to Aurora?

    Before booking your flight to Aurora from Ontario, check out the most reliable airlines to get you to your destination on time: Air Canada (88%), United Airlines (88%), Volaris( 87%).

  • What are the cheapest flights from Ontario to Aurora?

    The cheapest flight price from Ontario to Aurora is $96. On average you can expect to pay $745. The most popular route, (Ontario - Denver Intl), can usually be booked for $95.

  • Can I find deals for flights from Ontario to Aurora that include hotel bookings?

    Yes. In addition to deals on Ontario to Aurora flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Aurora?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Aurora.

  • Can I find deals for business class flights from Ontario to Aurora?

    Yes. Cheapflights offers flight deals from Ontario to Aurora by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Aurora?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Aurora (average of $45). Flying from Ontario to Aurora in March is currently the most expensive (average of $77). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 4 airlines flying from Ontario to Aurora

Discover the top 4 airlines that operate flights from Ontario to Aurora. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$64Average$161FlexibilityNo cancel feeOn-time62%
DeltaCheapest$109Average$272FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$149Average$314FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$154Average$329FlexibilityNo cancel feeOn-time69%

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