How long is the flight from Ontario to Casper?

There are many flights that can get you from Ontario to Casper in 6h 16m. Fly via United Airlines to get the fastest option. Ontario and Casper are separated by a distance of 856 mi.

In terms of precipitation, rainfall in Casper ranges from 0.5 - 2.0 inches per month. May is typically the wettest month, when rainfall can reach 2.0 in. January is typically the driest time to visit Casper when rainfall is around 0.5 in.

If weather is an important factor for your trip to Casper, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 23.0 F).

What is the cheapest time of day to fly from ONT to CPR?

When flying from Ontario to Casper, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Most accurate provider : When it comes to deals on Ontario-Casper flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Casper flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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.

$268+ Flights from Ontario to Casper

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Ontario to Casper 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 Ontario to Casper

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$268 (United Airlines)
Popular in	December
Cheapest in	April
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. 6% potential increase in price ($34 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease ($27 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in January 2026

Search Deals

Find 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 8, 2026.

Fri 1/231:24 pmONT - CPR

1 stop6h 16mUnited Airlines

Tue 1/277:00 amCPR - ONT

1 stop6h 47mUnited Airlines

Deal found 1/8

$268

Tue 1/275:05 amONT - CPR

1 stop8h 37mUnited Airlines

Sat 1/317:00 amCPR - ONT

1 stop6h 47mUnited Airlines

Deal found 1/7

$333

Thu 1/225:05 amONT - CPR

1 stop4h 48mUnited Airlines

Sun 1/255:30 amCPR - ONT

1 stop8h 17mUnited Airlines

Deal found 1/8

$338

Wed 3/45:00 amONT - CPR

1 stop6h 40mUnited Airlines

Mon 3/91:25 pmCPR - ONT

1 stop8h 25mUnited Airlines

Deal found 1/8

$363

Sat 1/171:24 pmONT - CPR

1 stop4h 42mUnited Airlines

Tue 1/201:16 pmCPR - ONT

1 stop8h 42mUnited Airlines

Deal found 1/6

$368

Best flights from Ontario to Casper
Discover carefully curated flight deals from Ontario to Casper that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 8, 2026.

Fri 1/231:24 pmONT - CPR

1 stop6h 16mUnited Airlines

Tue 1/277:00 amCPR - ONT

1 stop6h 47mUnited Airlines

Deal found 1/8

$268

Fri 2/135:00 amONT - CPR

1 stop8h 40mUnited Airlines

Sun 2/153:15 pmCPR - ONT

1 stop6h 35mUnited Airlines

Deal found 1/6

$328

Tue 1/275:05 amONT - CPR

1 stop8h 37mUnited Airlines

Sat 1/317:00 amCPR - ONT

1 stop6h 47mUnited Airlines

Deal found 1/7

$333

Thu 1/225:05 amONT - CPR

1 stop4h 48mUnited Airlines

Sun 1/255:30 amCPR - ONT

2 stops13h 13mUnited Airlines

Deal found 1/8

$344

Wed 3/45:00 amONT - CPR

1 stop6h 40mUnited Airlines

Mon 3/91:25 pmCPR - ONT

1 stop8h 25mUnited Airlines

Deal found 1/8

$363

Sat 1/175:05 amONT - CPR

1 stop6h 30mUnited Airlines

Tue 1/203:17 pmCPR - ONT

1 stop6h 41mUnited Airlines

Deal found 1/5

$368

Last-minute flights from Ontario to Casper
Discover last-minute flight deals from Ontario to Casper. Data last updated January 8, 2026 and is based on user searches.

Sat 1/171:24 pmONT - CPR

1 stop4h 42mUnited Airlines

Tue 1/201:16 pmCPR - ONT

1 stop8h 42mUnited Airlines

Deal found 1/6

$368

Thu 1/225:05 amONT - CPR

1 stop4h 48mUnited Airlines

Sun 1/255:30 amCPR - ONT

1 stop8h 17mUnited Airlines

Deal found 1/8

$338

Fri 1/231:24 pmONT - CPR

1 stop6h 16mUnited Airlines

Tue 1/277:00 amCPR - ONT

1 stop6h 47mUnited Airlines

Deal found 1/8

$268

Tue 1/275:05 amONT - CPR

1 stop8h 37mUnited Airlines

Sat 1/317:00 amCPR - ONT

1 stop6h 47mUnited Airlines

Deal found 1/7

$333

One-way flights from Ontario to Casper
Search for one-way flight options from Ontario to Casper. Find affordable one-way fares based on user searches. Data last updated January 8, 2026.

Tue 1/135:05 amONT - CPR

1 stop6h 30mUnited Airlines

Deal found 1/6

$384

Fly from

Fly to

Route

Depart

Return

Price

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 1/23

1:24 pm-8:40 pm

1 stop6h 16m

Casper Natrona County

Tue 1/27

7:00 am-12:47 pm

1 stop6h 47m

$268

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 2/13

5:00 am-2:40 pm

1 stop8h 40m

Casper Natrona County

Sun 2/15

3:15 pm-8:50 pm

1 stop6h 35m

$328

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Tue 1/27

5:05 am-2:42 pm

1 stop8h 37m

Casper Natrona County

Sat 1/31

7:00 am-12:47 pm

1 stop6h 47m

$333

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 1/22

5:05 am-10:53 am

1 stop4h 48m

Casper Natrona County

Sun 1/25

5:30 am-5:43 pm

2 stops13h 13m

$344

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 3/4

5:00 am-12:40 pm

1 stop6h 40m

Casper Natrona County

Mon 3/9

1:25 pm-8:50 pm

1 stop8h 25m

$363

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Sat 1/17

5:05 am-12:35 pm

1 stop6h 30m

Casper Natrona County

Tue 1/20

3:17 pm-8:58 pm

1 stop6h 41m

$368

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

Compare providers for flights from Ontario to Casper

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.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Casper flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

Reviews of airlines servicing Casper

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

9,139 reviews

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

9,139 reviews

United Airlines

7.4

Good

9,139 reviews

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

How long is the flight from Ontario to Casper?
There are many flights that can get you from Ontario to Casper in 6h 16m. 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Ontario to Casper

Los Angeles to Salt Lake City flights

Los Angeles to Denver flights

San Francisco to Denver flights

Santa Ana to Salt Lake City flights

Ontario to Denver flights

San Francisco to Salt Lake City flights

Ontario to Salt Lake City flights

Santa Ana to Denver flights

Burbank to Salt Lake City flights

Burbank to Denver flights

San Jose to Denver flights

San Diego to Salt Lake City flights

San Jose to Salt Lake City flights

Sacramento to Denver flights

Oakland to Salt Lake City flights

San Diego to Denver flights

Las Vegas to Salt Lake City flights

Las Vegas to Denver flights

Sacramento to Salt Lake City flights

Long Beach to Salt Lake City flights

Oakland to Denver flights

Los Angeles to Jackson flights

San Francisco to Jackson flights

Fresno to Denver flights

Palm Springs to Denver flights

Reno to Denver flights

Monterey to Denver flights

Santa Barbara to Salt Lake City flights

San Luis Obispo to Denver flights

Medford to Denver flights

Fresno to Salt Lake City flights

Ontario to Jackson flights

Palm Springs to Salt Lake City flights

Reno to Salt Lake City flights

Santa Barbara to Denver flights

Bakersfield to Denver flights

Long Beach to Denver flights

San Diego to Jackson flights

Medford to Salt Lake City flights

Santa Rosa to Denver flights

San Luis Obispo to Salt Lake City flights

Redding to Denver flights

Sacramento to Jackson flights

San Jose to Jackson flights

Santa Ana to Jackson flights

Monterey to Salt Lake City flights

Burbank to Jackson flights

Fresno to Jackson flights

Long Beach to Jackson flights

Las Vegas to Jackson flights

Top airline flying from Ontario to Casper

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$243	Average$388	FlexibilityNo cancel fee	On-time69%

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.

$268+ 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Casper with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ontario to Casper

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Casper

Cheapest flights from Ontario to CasperExplore 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 8, 2026.

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 8, 2026.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Casper that are best for you.

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.

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.

Reviews of airlines servicing Casper

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.

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?

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

How can I find direct flights from Ontario to Casper?

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

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 Ontario to Casper

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Ontario to Casper

100% Free

Book with Flexibility

Travel Smart

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 8, 2026.