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Casper

$358+ Cheap flights from Ontario to Casper (ONT - CPR)

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 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — CPR
Jul 24 — Jul 311
Fri 7/24
Fri 7/31
1 adult, Economy
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Cheap flight deals from Ontario to Casper

Cheapest flights from Ontario to Casper
Explore the most affordable flight options available from Ontario to Casper. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 24, 2026.

This United Airlines deal was found by Cheapflights users on 6/23. 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 8/295:00 am
ONT
-
CPR
1 stop6h 45m
United Airlines
Tue 9/15:15 am
CPR
-
ONT
1 stop8h 35m
United Airlines
Deal found 6/23$378
This United Airlines deal was found by Cheapflights users on 6/22. 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 10/271:52 pm
ONT
-
CPR
2 stops7h 20m
United Airlines
Sat 10/313:15 pm
CPR
-
ONT
1 stop6h 41m
United Airlines
Deal found 6/22$384
This United Airlines deal was found by Cheapflights users on 6/22. 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 9/171:18 pm
ONT
-
CPR
1 stop6h 09m
United Airlines
Wed 9/231:26 pm
CPR
-
ONT
2 stops7h 35m
United Airlines
Deal found 6/22$429
This United Airlines deal was found by Cheapflights users on 6/20. 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 9/231:18 pm
ONT
-
CPR
1 stop4h 51m
United Airlines
Sat 9/263:11 pm
CPR
-
ONT
1 stop6h 47m
United Airlines
Deal found 6/20$474
This United Airlines deal was found by Cheapflights users on 6/22. 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 7/81:18 pm
ONT
-
CPR
1 stop7h 41m
United Airlines
Tue 7/147:05 am
CPR
-
ONT
2 stops16h 32m
United Airlines
Deal found 6/22$479
This United Airlines deal was found by Cheapflights users on 6/19. 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 12/85:00 am
ONT
-
CPR
1 stop11h 04m
United Airlines
Sat 12/127:00 am
CPR
-
ONT
2 stops11h 47m
United Airlines
Deal found 6/19$512
This United Airlines deal was found by Cheapflights users on 6/22. 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 9/185:00 am
ONT
-
CPR
1 stop4h 49m
United Airlines
Fri 9/253:11 pm
CPR
-
ONT
1 stop6h 47m
United Airlines
Deal found 6/22$519
This United Airlines deal was found by Cheapflights users on 6/22. 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 9/21:18 pm
ONT
-
CPR
1 stop4h 51m
United Airlines
Mon 9/74:15 pm
CPR
-
ONT
1 stop5h 38m
United Airlines
Deal found 6/22$523

Find flight deals from Ontario to Casper

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Casper (CPR). 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 June 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$378
(United Airlines)

One-way from

$358
(United Airlines)

Popular in

May

Cheapest in

March

Average price

$781
Provider with most accurate pricing for Ontario-Casper Natrona County flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Casper Natrona County flights.
Search Deals
From Ontario to Casper Natrona County
Search Deals
One-way flight from Ontario to Casper Natrona County
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($194 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Casper 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 June 24, 2026.
Use the filters below to find and compare flights from Ontario to Casper that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Sat 8/29

5:00 am-12:45 pm

1 stop6h 45m

Casper Natrona County

Tue 9/1

5:15 am-12:50 pm

1 stop8h 35m

$378

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 9/17

1:18 pm-8:27 pm

1 stop6h 09m

Casper Natrona County

Wed 9/23

1:26 pm-8:01 pm

2 stops7h 35m

$429

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 7/8

1:18 pm-9:59 pm

1 stop7h 41m

Casper Natrona County

Tue 7/14

7:05 am-10:37 pm

2 stops16h 32m

$479
Quickest round-trip

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 9/2

1:18 pm-7:09 pm

1 stop4h 51m

Casper Natrona County

Mon 9/7

4:15 pm-8:53 pm

1 stop5h 38m

$523

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Tue 8/4

5:00 am-5:29 pm

1 stop11h 29m

Casper Natrona County

Sun 8/9

5:15 am-12:47 pm

1 stop8h 32m

$606

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 7/8

5:00 am-12:42 pm

1 stop6h 42m

Casper Natrona County

Wed 7/15

7:05 am-12:47 pm

1 stop6h 42m

$930

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Sun 7/19

5:00 am-12:42 pm

1 stop6h 42m

Casper Natrona County

Sat 7/25

8:45 am-12:47 pm

1 stop5h 02m

$1,144
Cheapest one-way
Quickest one-way

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 7/10

1:18 pm-7:10 pm

1 stop4h 52m

$358

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/22

Sorted by cheapest first

Compare providers for flights from Ontario to Casper

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 Casper in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust 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 Ontario-Casper flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Casper flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Casper flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Casper 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 Ontario-Casper 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 Casper

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

Related info for your journey

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

    There are many flights that can get you from Ontario to Casper in 6h 45m. Fly via United Airlines to get the fastest option. Ontario and Casper are separated by a distance of 856 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Casper 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

Traveling to a place near Casper?

Book flights to Casper if you plan to visit one of these locations
Rawlins

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