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Casper

$398+ Cheap flights from Ontario to Casper (ONT - CPR)

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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — CPR
May 9 — May 161
Sat 5/9
Sat 5/16
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 April 9, 2026.

This United Airlines deal was found by Cheapflights users on 4/5. 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 4/285:10 am
ONT
-
CPR
1 stop4h 37m
United Airlines
Sat 5/25:25 am
CPR
-
ONT
1 stop8h 13m
United Airlines
Deal found 4/5$398
This United Airlines deal was found by Cheapflights users on 4/7. 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.
Sat 5/91:40 pm
ONT
-
CPR
1 stop4h 17m
United Airlines
Tue 5/129:00 am
CPR
-
ONT
1 stop4h 38m
United Airlines
Deal found 4/7$418
This United Airlines deal was found by Cheapflights users on 4/8. 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.
Thu 4/235:10 am
ONT
-
CPR
1 stop4h 37m
United Airlines
Mon 4/273:14 pm
CPR
-
ONT
1 stop6h 22m
United Airlines
Deal found 4/8$428
This deal was found by Cheapflights users on 4/6. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/161:34 pm
ONT
-
CPR
1 stop5h 52m
United Airlines
Tue 4/289:05 am
CPR
-
ONT
1 stop4h 33m
United Airlines
Deal found 4/6$443
This United Airlines deal was found by Cheapflights users on 4/9. 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 5/75:00 am
ONT
-
CPR
1 stop4h 48m
United Airlines
Thu 5/145:25 am
CPR
-
ONT
2 stops7h 57m
United Airlines
Deal found 4/9$480

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 April 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$398
(United Airlines)

Popular in

December

Cheapest in

March

Average price

$398
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
Highest demand for flights based on searches. 17% potential increase in price ($85 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 9, 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

Tue 4/28

5:10 am-10:47 am

1 stop4h 37m

Casper Natrona County

Sat 5/2

5:25 am-12:38 pm

1 stop8h 13m

$398

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Sat 5/9

6:00 am-6:57 pm

2 stops11h 57m

Casper Natrona County

Tue 5/12

11:23 am-5:52 pm

2 stops7h 29m

$409

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Tue 5/5

5:00 am-2:39 pm

1 stop8h 39m

Casper Natrona County

Tue 5/12

11:23 am-5:52 pm

2 stops7h 29m

$424

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 4/23

5:10 am-10:47 am

1 stop4h 37m

Casper Natrona County

Mon 4/27

5:25 am-12:20 pm

2 stops7h 55m

$434
Quickest round-trip

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 5/15

1:40 pm-6:57 pm

1 stop4h 17m

Casper Natrona County

Sat 5/23

8:45 am-12:47 pm

1 stop5h 02m

$443

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 5/7

5:00 am-10:48 am

1 stop4h 48m

Casper Natrona County

Thu 5/14

5:25 am-12:22 pm

2 stops7h 57m

$480

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/5

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 April.
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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Casper

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

Currently, March is the cheapest month in which you can book a flight from Ontario to Casper (average of $258). Flying from Ontario to Casper in December is currently the most expensive (average of $543). 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 Casper

Get insights into the airlines that provide service to Casper. 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 Casper. Reviews last updated April 9, 2026.
Peruse reviews from past customers who have flown with United Airlines from Ontario to Casper to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,554 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Kathy,Jun 2024

RDD - SFO

United has consistently been good. Every now and then there is a crew member that should probably retire, but most of them are excellent.
United Airlines
7.4
Good
9,554 reviews
United Airlines
7.4
Good
9,554 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Kathy,Jun 2024

RDD - SFO

United has consistently been good. Every now and then there is a crew member that should probably retire, but most of them are excellent.

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 4h 37m. Fly via United Airlines to get the fastest option. Ontario and Casper are separated by a distance of 856 mi.

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

    Currently priced at $243, United Airlines will fly you from Ontario to Casper and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip.

  • 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.

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

    Currently, March is the cheapest month in which you can book a flight from Ontario to Casper (average of $258). Flying from Ontario to Casper in December is currently the most expensive (average of $543). 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

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Top airline flying from Ontario to Casper

Discover the top airline that operate flights from Ontario to Casper. 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 April 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$243Average$409FlexibilityNo cancel feeOn-time69%

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