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Casper

$258+ 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
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
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 January 21, 2026.

This United Airlines deal was found by Cheapflights users on 1/21. 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 4/281:34 pm
ONT
-
CPR
1 stop4h 25m
United Airlines
Tue 5/59:00 am
CPR
-
ONT
1 stop4h 38m
United Airlines
Deal found 1/21$258
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Mon 6/15:00 am
ONT
-
CPR
1 stop4h 53m
United Airlines
Sat 6/63:15 pm
CPR
-
ONT
1 stop6h 02m
United Airlines
Deal found 1/20$295
This United Airlines deal was found by Cheapflights users on 1/20. 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 2/181:45 pm
ONT
-
CPR
1 stop7h 24m
United Airlines
Sat 2/211:20 pm
CPR
-
ONT
1 stop8h 30m
United Airlines
Deal found 1/20$328
This United Airlines deal was found by Cheapflights users on 1/20. 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 1/211:24 pm
ONT
-
CPR
1 stop4h 42m
United Airlines
Wed 1/289:00 am
CPR
-
ONT
1 stop4h 47m
United Airlines
Deal found 1/20$343
This United Airlines deal was found by Cheapflights users on 1/21. 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 2/275:00 am
ONT
-
CPR
1 stop4h 51m
United Airlines
Sun 3/17:10 am
CPR
-
ONT
1 stop6h 33m
United Airlines
Deal found 1/21$356
This United Airlines deal was found by Cheapflights users on 1/19. 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.
Fri 4/35:10 am
ONT
-
CPR
1 stop8h 29m
United Airlines
Tue 4/75:25 am
CPR
-
ONT
1 stop8h 13m
United Airlines
Deal found 1/19$363
This United Airlines deal was found by Cheapflights users on 1/21. 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 4/135:10 am
ONT
-
CPR
1 stop6h 36m
United Airlines
Mon 4/201:21 pm
CPR
-
ONT
1 stop8h 15m
United Airlines
Deal found 1/21$409

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 January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$258
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$363
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. 8% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 21, 2026.
Use the filters below to find and compare flights from Ontario to Casper that are best for you.

Fly from

Ontario

Fly to

Casper

Route

Depart

Return

Price

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Tue 4/28

1:34 pm-6:59 pm

1 stop4h 25m

Casper Natrona County

Tue 5/5

9:00 am-12:38 pm

1 stop4h 38m

$258

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Mon 6/1

5:00 am-10:53 am

1 stop4h 53m

Casper Natrona County

Sat 6/6

3:15 pm-8:17 pm

1 stop6h 02m

$295

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 2/18

1:45 pm-8:26 pm

1 stop5h 41m

Casper Natrona County

Sat 2/21

9:00 am-12:43 pm

1 stop4h 43m

$328

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 4/3

5:10 am-2:39 pm

1 stop8h 29m

Casper Natrona County

Tue 4/7

5:25 am-12:14 pm

2 stops7h 49m

$334

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 2/27

5:00 am-10:51 am

1 stop4h 51m

Casper Natrona County

Sun 3/1

7:10 am-12:43 pm

1 stop6h 33m

$356

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 2/13

1:45 pm-8:26 pm

1 stop5h 41m

$278

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 2/20

1:45 pm-8:26 pm

1 stop5h 41m

$278

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Tue 2/17

5:00 am-12:40 pm

1 stop6h 40m

$278

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Mon 2/16

5:00 am-10:51 am

1 stop4h 51m

$278

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 2/19

5:00 am-10:51 am

1 stop4h 51m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 11 results
1
2

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 Expedia the most. Expedia 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, April is the cheapest month in which you can book a flight from Ontario to Casper (average of $255). 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 January 21, 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
9,191 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

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
9,191 reviews
United Airlines
7.4
Good
9,191 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

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 25m. 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.

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

    Currently, April is the cheapest month in which you can book a flight from Ontario to Casper (average of $255). 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 January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$243Average$388FlexibilityNo cancel feeOn-time69%

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