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$109+ Cheap flights from Colorado Springs to Ontario (COS - ONT)

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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
COS — ONT
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Colorado Springs to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Colorado Springs (COS) to Ontario (ONT). 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 August 14, 2025.

Round-trip from

$217
(Delta)

One-way from

$109
(Delta)

Popular in

January

Cheapest in

June

Average price

$328
From Colorado Springs to Ontario
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One-way flight from Colorado Springs to Ontario
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Highest demand for flights based on searches. 20% potential increase in price ($110 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Colorado Springs to Ontario

Cheapest flights from Colorado Springs to Ontario
Explore the most affordable flight options available from Colorado Springs to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/48:09 amCOS - ONT
1 stop5h 05mDelta
Tue 12/25:05 pmONT - COS
1 stop4h 24mDelta
Deal found 8/13$217
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/75:49 pmCOS - ONT
1 stop4h 31mDelta
Sat 12/65:05 pmONT - COS
1 stop4h 24mDelta
Deal found 8/13$245
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/75:49 pmCOS - ONT
1 stop4h 31mDelta
Mon 12/15:05 pmONT - COS
1 stop4h 24mDelta
Deal found 8/13$273
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/188:15 amCOS - ONT
1 stop5h 02mDelta
Mon 9/224:40 pmONT - COS
1 stop4h 31mDelta
Deal found 8/13$278
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/17:30 amCOS - ONT
1 stop6h 21mUnited Airlines
Tue 10/74:15 pmONT - COS
1 stop4h 39mUnited Airlines
Deal found 8/13$279
This United Airlines deal was found by Cheapflights users on 8/13. 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 9/1111:35 amCOS - ONT
1 stop6h 54mUnited Airlines
Tue 9/165:10 amONT - COS
1 stop7h 04mUnited Airlines
Deal found 8/13$283
This United Airlines deal was found by Cheapflights users on 8/14. 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.
Fri 9/512:50 pmCOS - ONT
1 stop5h 39mUnited Airlines
Sun 9/75:10 amONT - COS
1 stop7h 04mUnited Airlines
Deal found 8/14$287
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Mon 9/85:16 pmCOS - ONT
1 stop6h 17mAmerican Airlines
Tue 9/162:54 pmONT - COS
1 stop6h 14mAmerican Airlines
Deal found 8/14$290
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/95:55 pmCOS - ONT
1 stop6h 51mDelta
Tue 12/25:05 pmONT - COS
1 stop4h 24mDelta
Deal found 8/13$308
This United Airlines deal was found by Cheapflights users on 8/14. 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.
Mon 9/223:45 pmCOS - ONT
1 stop5h 58mUnited Airlines
Wed 10/16:27 pmONT - COS
1 stop4h 25mUnited Airlines
Deal found 8/14$311
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/308:00 amCOS - ONT
1 stop5h 14mDelta
Mon 9/14:50 pmONT - COS
1 stop4h 28mDelta
Deal found 8/13$312

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado Springs to Ontario 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 August 14, 2025.
Use the filters below to find and compare flights from Colorado Springs to Ontario that are best for you.

Fly from

Colorado Springs

Fly to

Ontario

Route

Depart

Return

Price

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 11/4

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Sat 12/6

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Thu 11/6

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Tue 12/2

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Wed 11/5

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Tue 12/2

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Wed 11/5

8:09 am-12:14 pm

1 stop5h 05m

Ontario

Thu 12/4

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Wed 11/5

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Sat 12/6

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 11/4

8:09 am-12:14 pm

1 stop5h 05m

Ontario

Wed 12/3

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 11/4

8:09 am-12:14 pm

1 stop5h 05m

Ontario

Tue 12/2

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Thu 11/6

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Wed 12/3

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 11/4

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Fri 12/5

5:05 pm-10:29 pm

1 stop4h 24m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Sat 11/8

5:49 pm-9:20 pm

1 stop4h 31m

Ontario

Wed 12/3

5:05 pm-10:29 pm

1 stop4h 24m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 21 results
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2
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Best time to book a flight from Colorado Springs to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Colorado Springs 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 Colorado Springs to Ontario

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

Currently, August is the cheapest month in which you can book a flight from Colorado Springs to Ontario (average of $246). Flying from Colorado Springs to Ontario in March is currently the most expensive (average of $328). 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 COS to ONT?

Find hourly flight availability from Colorado Springs to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 14% on flights from Colorado Springs to Ontario by exploring options for tickets in the evening.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated August 14, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Colorado Springs to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

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

  • What are the cheapest airlines flying from Colorado Springs to Ontario round-trip?

    Our cheapest airline available from Colorado Springs to Ontario is Delta. Our recent data shows that you can find tickets from as low as $177 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $212 and $296 round-trip. Users have found that Delta is 57% cheaper than the other options available to this destination.

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

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

  • How can I find direct flights from Colorado Springs to Ontario?

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

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

    Yes. Cheapflights offers flight deals from Colorado Springs to Ontario 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 Colorado Springs to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Colorado Springs to Ontario (average of $246). Flying from Colorado Springs to Ontario in March is currently the most expensive (average of $328). 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.

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Alternative routes for Colorado Springs to Ontario

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Top 3 airlines flying from Colorado Springs to Ontario

Discover the top 3 airlines that operate flights from Colorado Springs to Ontario. 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$177Average$288FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$212Average$388FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$296Average$397FlexibilityNo cancel feeOn-time69%

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