HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Aspen

$229+ Cheap flights from Ontario to Aspen (ONT - ASE)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ASE
Dec 31 — Jan 71
Wed 12/31
Wed 1/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Aspen with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Find flight deals from Ontario to Aspen

Cheapest flights from Ontario to Aspen
Explore the most affordable flight options available from Ontario to Aspen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 1, 2025.

This United Airlines deal was found by Cheapflights users on 11/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:05 amONT - ASE
1 stop4h 24mUnited Airlines
Thu 12/253:27 pmASE - ONT
1 stop6h 40mUnited Airlines
Deal found 11/30$354
This United Airlines deal was found by Cheapflights users on 12/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:05 amONT - ASE
1 stop4h 59mUnited Airlines
Wed 12/245:00 pmASE - ONT
1 stop5h 07mUnited Airlines
Deal found 12/1$365
This American Airlines deal was found by Cheapflights users on 11/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1910:50 amONT - ASE
1 stop7h 47mAmerican Airlines
Mon 12/2210:35 amASE - ONT
1 stop6h 15mAmerican Airlines
Deal found 11/30$399
This American Airlines deal was found by Cheapflights users on 12/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1010:47 amONT - ASE
1 stop7h 47mAmerican Airlines
Tue 12/167:33 amASE - ONT
1 stop7h 22mAmerican Airlines
Deal found 12/1$449
This United Airlines deal was found by Cheapflights users on 11/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:05 amONT - ASE
1 stop4h 24mUnited Airlines
Sun 12/289:05 amASE - ONT
1 stop4h 33mUnited Airlines
Deal found 11/30$450
This United Airlines deal was found by Cheapflights users on 11/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:34 pmONT - ASE
1 stop6h 44mUnited Airlines
Thu 12/115:12 pmASE - ONT
1 stop4h 30mUnited Airlines
Deal found 11/30$469
This United Airlines deal was found by Cheapflights users on 12/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/105:05 amONT - ASE
1 stop4h 33mUnited Airlines
Mon 12/155:12 pmASE - ONT
1 stop4h 30mUnited Airlines
Deal found 12/1$479
This United Airlines deal was found by Cheapflights users on 11/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/145:05 amONT - ASE
1 stop4h 33mUnited Airlines
Tue 12/167:28 amASE - ONT
1 stop6h 04mUnited Airlines
Deal found 11/29$481
This American Airlines deal was found by Cheapflights users on 12/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1010:47 amONT - ASE
1 stop7h 47mAmerican Airlines
Sat 12/1312:25 pmASE - ONT
1 stop6h 52mAmerican Airlines
Deal found 12/1$484

Cheap flight deals from Ontario to Aspen

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Aspen (ASE). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$229
(United Airlines)

Popular in

February

Cheapest in

September

Average price

$483
Provider with most accurate pricing for Ontario-Aspen Pitkin County flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Aspen Pitkin County flights.
Search Deals
From Ontario to Aspen Pitkin County
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Aspen 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 December 1, 2025.
Use the filters below to find and compare flights from Ontario to Aspen that are best for you.

Fly from

Ontario

Fly to

Aspen

Route

Depart

Return

Price

OntarioAspen

ONT - ASE

ONTASE

Ontario

Mon 1/5

5:05 am-12:49 pm

1 stop6h 44m

Aspen Pitkin County

Sat 1/10

5:02 pm-8:58 pm

1 stop4h 56m

$229

OntarioAspen

ONT - ASE

ONTASE

Ontario

Sat 1/10

6:27 am-11:53 am

1 stop4h 26m

Aspen Pitkin County

Wed 1/14

7:30 am-2:18 pm

1 stop7h 48m

$299

OntarioAspen

ONT - ASE

ONTASE

Ontario

Sun 1/25

5:05 am-11:04 am

1 stop4h 59m

Aspen Pitkin County

Sat 1/31

5:02 pm-8:58 pm

1 stop4h 56m

$299

OntarioAspen

ONT - ASE

ONTASE

Ontario

Sat 2/7

6:00 am-12:17 pm

1 stop5h 17m

Aspen Pitkin County

Wed 2/11

5:02 pm-8:58 pm

1 stop4h 56m

$299

OntarioAspen

ONT - ASE

ONTASE

Ontario

Sat 1/10

5:05 am-11:04 am

1 stop4h 59m

Aspen Pitkin County

Wed 1/14

1:33 pm-10:53 pm

2 stops10h 20m

$304

OntarioAspen

ONT - ASE

ONTASE

Ontario

Fri 2/27

12:27 pm-6:27 pm

1 stop5h 00m

Aspen Pitkin County

Mon 3/2

10:40 am-4:26 pm

1 stop6h 46m

$309

OntarioAspen

ONT - ASE

ONTASE

Ontario

Thu 12/25

5:05 am-10:29 am

1 stop4h 24m

Aspen Pitkin County

Thu 12/25

3:27 pm-9:07 pm

1 stop6h 40m

$354

OntarioAspen

ONT - ASE

ONTASE

Ontario

Thu 1/8

5:05 am-11:04 am

1 stop4h 59m

Aspen Pitkin County

Mon 1/12

5:02 pm-8:58 pm

1 stop4h 56m

$355

OntarioAspen

ONT - ASE

ONTASE

Ontario

Thu 1/22

5:05 am-11:04 am

1 stop4h 59m

$241

OntarioAspen

ONT - ASE

ONTASE

Ontario

Fri 1/9

6:00 am-12:52 pm

1 stop5h 52m

$241

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/1

Showing 1-10 of 16 results
1
2

Compare providers for flights from Ontario to Aspen

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Aspen in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Aspen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Aspen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Aspen flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Aspen flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Aspen flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Aspen

Have a flexible travel schedule? Discover the best time to fly to Aspen 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 Aspen

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Aspen (average of $76). Flying from Ontario to Aspen in March is currently the most expensive (average of $205). 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.

Reviews of airlines servicing Aspen

Get insights into the airlines that provide service to Aspen. 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 Aspen. Reviews last updated December 1, 2025.
See what other customers who have flown with United Airlines from Ontario to Aspen have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,056 reviews

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.
United Airlines
7.4
Good
9,056 reviews
United Airlines
7.4
Good
9,056 reviews

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Related info for your journey

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

  • How long is the flight from Ontario to Aspen?

    Airlines like United Airlines and American Airlines fly from Ontario to Aspen in about 4h 26m. The time it takes to get you to your destination can typically vary by up to 2h 18m. The distance from Ontario to Aspen is about 692 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from Ontario to Aspen round-trip?

    Cheapflights users have booked flights from Ontario to Aspen round-trip from $263.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Aspen 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 Aspen?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Aspen (average of $76). Flying from Ontario to Aspen in March is currently the most expensive (average of $205). 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

Traveling to a place near Aspen?

Book flights to Aspen if you plan to visit one of these locations
Snowmass Village
Buena Vista
Snowmass

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Aspen

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Denver flights
San Francisco to Denver flights
Ontario to Denver flights
Santa Ana to Denver flights
Burbank to Denver flights
San Diego to Denver flights
Las Vegas to Denver flights
Sacramento to Denver flights
San Jose to Denver flights
Los Angeles to Aspen flights
Reno to Denver flights
San Francisco to Aspen flights
Bakersfield to Denver flights
Fresno to Denver flights
Oakland to Denver flights
San Francisco to Vail flights
Palm Springs to Denver flights
Los Angeles to Hayden flights
Los Angeles to Vail flights
Long Beach to Denver flights
San Luis Obispo to Denver flights
Medford to Denver flights
Los Angeles to Colorado Springs flights
Ontario to Colorado Springs flights
Santa Barbara to Denver flights
San Francisco to Montrose flights
Monterey to Denver flights
Los Angeles to Durango flights
Santa Rosa to Denver flights
Arcata to Denver flights
San Diego to Colorado Springs flights
San Diego to Vail flights
San Diego to Durango flights
San Diego to Hayden flights
Palm Springs to Colorado Springs flights
Las Vegas to Colorado Springs flights
Los Angeles to Grand Junction flights
Ontario to Vail flights
Redding to Denver flights
Sacramento to Colorado Springs flights
San Francisco to Colorado Springs flights
San Francisco to Durango flights
Santa Ana to Colorado Springs flights
Long Beach to Colorado Springs flights
Ontario to Montrose flights
Los Angeles to Montrose flights
San Francisco to Grand Junction flights
Burbank to Colorado Springs flights
Santa Ana to Grand Junction flights

Top airline flying from Ontario to Aspen

Discover the top airline that operate flights from Ontario to Aspen. 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 December 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$263Average$534FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.