$99 Cheap Flights from Colorado Springs (COS) to Ontario (ONT)

View $99 flight on Tue, Mar 3, 2026Opens in a new window

Popular airlines from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Colorado Springs to Ontario (COS-ONT)

Prices were available within the past 7 days and start at $99 for one-way flights and $164 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Jan 24 - Wed, Jan 28
COS
Colorado Springs
ONT
Ontario
$164 Roundtrip, found 5 days ago
$164
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Jan 24 from Colorado Springs to Ontario, returning Wed, Jan 28, priced at $164 found 5 days ago
American Airlines
Sat, Feb 14 - Tue, Feb 17
COS
Colorado Springs
ONT
Ontario
$176 Roundtrip, found 5 days ago
$176
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Feb 14 from Colorado Springs to Ontario, returning Tue, Feb 17, priced at $176 found 5 days ago
United
Sat, Jan 17 - Sat, Jan 24
COS
Colorado Springs
ONT
Ontario
$180 Roundtrip, found 5 days ago
$180
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jan 17 from Colorado Springs to Ontario, returning Sat, Jan 24, priced at $180 found 5 days ago
American Airlines
Sat, Feb 14 - Tue, Feb 17
COS
Colorado Springs
ONT
Ontario
$199 Roundtrip, found 5 days ago
$199
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Feb 14 from Colorado Springs to Ontario, returning Tue, Feb 17, priced at $199 found 5 days ago
United
Sat, Feb 21 - Sun, Mar 1
COS
Colorado Springs
ONT
Ontario
$200 Roundtrip, found 5 days ago
$200
Roundtrip
found 5 days ago
Select United flight, departing Sat, Feb 21 from Colorado Springs to Ontario, returning Sun, Mar 1, priced at $200 found 5 days ago
Delta
Wed, Jan 21 - Sat, Jan 31
COS
Colorado Springs
ONT
Ontario
$205 Roundtrip, found 4 hours ago
$205
Roundtrip
found 4 hours ago
Select Delta flight, departing Wed, Jan 21 from Colorado Springs to Ontario, returning Sat, Jan 31, priced at $205 found 4 hours ago
American Airlines
Sat, Feb 14 - Tue, Feb 17
COS
Colorado Springs
ONT
Ontario
$211 Roundtrip, found 5 days ago
$211
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Feb 14 from Colorado Springs to Ontario, returning Tue, Feb 17, priced at $211 found 5 days ago
Southwest Airlines
Sat, Jan 24 - Wed, Jan 28
COS
Colorado Springs
ONT
Ontario
$212 Roundtrip, found 5 days ago
$212
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Jan 24 from Colorado Springs to Ontario, returning Wed, Jan 28, priced at $212 found 5 days ago
American Airlines
Wed, Jan 21 - Sat, Jan 31
COS
Colorado Springs
ONT
Ontario
$213 Roundtrip, found 4 hours ago
$213
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Wed, Jan 21 from Colorado Springs to Ontario, returning Sat, Jan 31, priced at $213 found 4 hours ago
United
Wed, Jan 21 - Sat, Jan 31
COS
Colorado Springs
ONT
Ontario
$213 Roundtrip, found 4 hours ago
$213
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Jan 21 from Colorado Springs to Ontario, returning Sat, Jan 31, priced at $213 found 4 hours ago

Find the cheapest month to fly from Colorado Springs (COS) to Ontario (ONT)

August is typically the cheapest month to fly

From $169 - $581 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $429
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $429
Flights from Colorado Springs (COS) to Ontario (ONT)
Origin airport
Colorado Springs
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$164
Distance
786 mi

Colorado Springs to Ontario Flights

The cheapest times to fly from Colorado Springs to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Colorado Springs to Ontario are during the month of January. You can find some of the cheapest flights from Colorado Springs to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Colorado Springs to Ontario

Sunday is one of the best days to book for cheap flights from Colorado Springs to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Colorado Springs to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Colorado Springs to Ontario in 2026. You can also book with separate airlines for your outbound and return journeys, from $99 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Colorado Springs to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Colorado Springs to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Lock in a cheap one-way flight from $99 or cheap return flight from $164 from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT)?
Flying in January can help you save, as it's the cheapest month for flights between COS and ONT. You'll often find the lowest fares during off-peak months.
What is the cheapest airline that flies from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT)?
To find the cheapest airline that'll fly you from COS to ONT, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll have to take a flight with a layover if you're traveling from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from COS to ONT?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT)?
To touch down at Los Angeles - Ontario Intl. Airport (ONT) without delays, pick a flight that leaves Colorado Springs Airport (COS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Booking your flight from COS to ONT right before your getaway is usually more expensive. But if you're flexible with your schedule, you could score a cheap last-minute fare.
Is it cheaper to book a COS to ONT flight and hotel package?
Opting for a COS to ONT flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our wide range of hotels and then add car rentals, flights and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Colorado Springs Airport (COS) to Los Angeles - Ontario Intl. Airport (ONT)?
In most cases, you're able to cancel or reschedule your COS to ONT flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like further information, head to our Customer Service portal.

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*Available to One Key members.