HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$308+ Cheap flights from Casper to Ontario (CPR - 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
CPR — ONT
Sep 9 — Sep 161
Wed 9/9
Wed 9/16
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Casper to Ontario 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.

Cheap flight deals from Casper to Ontario

Cheapest flights from Casper to Ontario
Explore the most affordable flight options available from Casper to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 10, 2026.

This United Airlines deal was found by Cheapflights users on 8/6. 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 8/294:15 pm -
1 stop5h 38m
Mon 8/315:00 am -
1 stop4h 49m
Deal found 8/6$388
This United Airlines deal was found by Cheapflights users on 8/10. 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 8/318:45 am -
1 stop5h 05m
Sun 9/65:00 am -
1 stop4h 48m
Deal found 8/10$390
This United Airlines deal was found by Cheapflights users on 8/8. 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 10/178:45 am -
2 stops10h 01m
Wed 10/218:03 am -
2 stops11h 14m
Deal found 8/8$399
This United Airlines deal was found by Cheapflights users on 8/6. 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 8/79:26 am -
2 stops9h 28m
Fri 8/141:18 pm -
1 stop4h 51m
Deal found 8/6$499
This United Airlines deal was found by Cheapflights users on 8/7. 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.
Tue 10/65:15 am -
1 stop8h 31m
Thu 10/85:00 am -
1 stop4h 48m
Deal found 8/7$616
This United Airlines deal was found by Cheapflights users on 8/6. 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 8/174:15 pm -
1 stop5h 38m
Thu 8/205:00 am -
1 stop4h 49m
Deal found 8/6$781

Find flight deals from Casper to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Casper (CPR) 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 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$388
(United Airlines)

One-way from

$308
(United Airlines)

Popular in

June

Cheapest in

April

Average price

$408
Provider with most accurate pricing for Casper Natrona County-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Casper Natrona County-Ontario flights.
Search Deals
From Casper Natrona County to Ontario
Search Deals
One-way flight from Casper Natrona County to Ontario
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Casper 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 10, 2026.
Use the filters below to find and compare flights from Casper to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Fri 10/30

1:29 pm-8:51 pm

1 stop8h 22m

Ontario

Wed 11/4

5:00 am-10:49 am

1 stop4h 49m

$388

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Fri 10/16

1:26 pm-8:58 pm

1 stop8h 32m

Ontario

Wed 10/21

5:00 am-10:48 am

1 stop4h 48m

$388

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Sat 10/17

3:11 pm-8:58 pm

1 stop6h 47m

Ontario

Wed 10/21

5:00 am-12:39 pm

1 stop6h 39m

$388

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Sat 8/29

4:15 pm-8:53 pm

1 stop5h 38m

Ontario

Mon 8/31

5:00 am-10:49 am

1 stop4h 49m

$388
Quickest round-trip

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Mon 8/31

8:45 am-12:50 pm

1 stop5h 05m

Ontario

Sun 9/6

5:00 am-10:48 am

1 stop4h 48m

$390
Cheapest one-way
Quickest one-way

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Mon 9/21

8:45 am-12:50 pm

1 stop5h 05m

$308

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Sat 8/29

7:05 am-12:50 pm

1 stop6h 45m

$363

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Mon 8/24

4:15 pm-8:53 pm

1 stop5h 38m

$363

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Sun 8/16

5:15 am-12:50 pm

1 stop8h 35m

$614

CasperOntario

CPR Casper Natrona County - ONT Ontario

CPRONT

Casper Natrona County

Sat 8/15

11:24 am-8:01 pm

2 stops9h 37m

$870

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/10

Sorted by cheapest first

Compare providers for flights from Casper to Ontario

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 Casper to Ontario in August.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars

*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 Casper-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Casper-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Casper-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Casper-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub 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 Casper-Ontario 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 Casper to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Casper 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.

Related info for your journey

Find useful and relevant information for your journey from Casper to Ontario. 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 Casper to Ontario?

    Airlines like United Airlines fly from Casper to Ontario in about 8h 22m. The time it takes to get you to your destination can typically vary by up to . The distance from Casper to Ontario is about 856 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Casper 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.

See more FAQs

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 Casper to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Las Vegas flights
Denver to Los Angeles flights
Denver to San Francisco flights
Denver to Ontario flights
Salt Lake City to Los Angeles flights
Denver to San Diego flights
Salt Lake City to San Diego flights
Denver to Santa Ana flights
Salt Lake City to San Francisco flights
Salt Lake City to Las Vegas flights
Denver to Reno flights
Salt Lake City to Santa Ana flights
Denver to San Jose flights
Denver to Burbank flights
Salt Lake City to Ontario flights
Denver to Sacramento flights
Denver to Palm Springs flights
Salt Lake City to Long Beach flights
Salt Lake City to San Jose flights
Denver to Santa Barbara flights
Salt Lake City to Oakland flights
Salt Lake City to Burbank flights
Denver to Oakland flights
Salt Lake City to Sacramento flights
Denver to Monterey flights
Denver to Fresno flights
Denver to Long Beach flights
Denver to San Luis Obispo flights
Denver to Medford flights
Denver to Santa Rosa flights
Salt Lake City to Reno flights
Denver to Arcata flights
Jackson to Los Angeles flights
Salt Lake City to Palm Springs flights
Salt Lake City to Santa Barbara flights
Salt Lake City to Fresno flights
Salt Lake City to Medford flights
Jackson to San Francisco flights
Casper to Las Vegas flights
Denver to Redding flights
Denver to Bakersfield flights
Salt Lake City to Santa Rosa flights
Jackson to San Diego flights
Jackson to Ontario flights
Rock Springs to Las Vegas flights
Jackson to Las Vegas flights
Salt Lake City to Monterey flights
Jackson to Long Beach flights
Salt Lake City to Tijuana flights

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.