$268 Cheap Flights from Ontario Intl. Airport (ONT) to Casper (CPR)

View $268 flight on Sat, Jun 20, 2026Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Casper, WY (CPR-Natrona County Intl.)

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Cheap Flights from Ontario Intl. Airport to Casper (ONT-CPR)

Prices were available within the past 7 days and start at $268 for one-way flights and $347 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Jun 19 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$347 Roundtrip, found 2 days ago
$347
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jun 19 from Ontario to Casper, returning Mon, Jun 22, priced at $347 found 2 days ago
United
Sat, Jun 20 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$372 Roundtrip, found 1 day ago
$372
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jun 20 from Ontario to Casper, returning Mon, Jun 22, priced at $372 found 1 day ago
United
Fri, Jun 19 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$373 Roundtrip, found 2 days ago
$373
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jun 19 from Ontario to Casper, returning Mon, Jun 22, priced at $373 found 2 days ago
United
Fri, Jun 19 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$375 Roundtrip, found 2 days ago
$375
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jun 19 from Ontario to Casper, returning Mon, Jun 22, priced at $375 found 2 days ago
United
Sat, May 30 - Tue, Jun 2
ONT
Ontario
CPR
Casper
$394 Roundtrip, found 4 days ago
$394
Roundtrip
found 4 days ago
Select United flight, departing Sat, May 30 from Ontario to Casper, returning Tue, Jun 2, priced at $394 found 4 days ago
United
Wed, Jun 17 - Wed, Jun 24
ONT
Ontario
CPR
Casper
$399 Roundtrip, found 6 hours ago
$399
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Jun 17 from Ontario to Casper, returning Wed, Jun 24, priced at $399 found 6 hours ago
United
Sat, Jun 20 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$401 Roundtrip, found 4 hours ago
$401
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Jun 20 from Ontario to Casper, returning Mon, Jun 22, priced at $401 found 4 hours ago
United
Sat, Jun 20 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$407 Roundtrip, found 4 hours ago
$407
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Jun 20 from Ontario to Casper, returning Mon, Jun 22, priced at $407 found 4 hours ago
United
Fri, Jun 19 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$414 Roundtrip, found 2 days ago
$414
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jun 19 from Ontario to Casper, returning Mon, Jun 22, priced at $414 found 2 days ago
United
Fri, Jun 19 - Mon, Jun 22
ONT
Ontario
CPR
Casper
$419 Roundtrip, found 2 days ago
$419
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jun 19 from Ontario to Casper, returning Mon, Jun 22, priced at $419 found 2 days ago

Alternative airports near Casper

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Natrona County Intl. CPR. Cheapest and Closest option available. Average driving time to city center is 12 minutes. Flights from $670
CPR
Natrona County Intl.
CheapestClosest
Average driving time to city center12 min
Flights from $670

Frequently asked questions

How much does a flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) cost?
You can find cheap one-way flights from $268 and cheap return flights from $347 Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) with Expedia. One-way flights usually range from $233 to $699, and return flights typically cost between $328 and $1449. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
April is the cheapest month to fly from Ontario, CA (ONT) to Casper, WY (CPR), with average round-trip fares around $243. This price is about 36% lower than the average throughout the year, as demand tends to decrease in spring. Other budget-friendly months to consider are January and March.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
Enter ONT to CPR and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
United is one of the cheapest airlines offering connecting flights from Ontario, CA (ONT) to Casper, WY (CPR), with round-trip tickets starting from around $238 with a layover in San Francisco Intl. (SFO). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
To find a cheap flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
The ideal times to fly from Ontario, CA (ONT) to Casper, WY (CPR) are in January and April. You can expect return flights to be around $243 during these months, making them the most budget-friendly options. January is often quieter post-holidays, while April offers a refreshing spring experience in Casper.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
The earliest flight from Ontario, CA (ONT) to Casper, WY (CPR) typically leaves at around 5:00 AM, operated by United Airlines. This seasonal service is active in April, allowing you to start your journey early and make the most of your time in Casper. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
The most popular departure times for flights from Ontario (ONT) to Casper (CPR) are from 6am to 9am. About 39% of passengers prefer this time window. Many major carriers, including Delta and United Airlines, offer flights during this window. This timing is favored as it allows travelers to start their day early and arrive in Casper with plenty of time to spare.
How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
A flight from ONT to CPR with a layover takes around 4 hours 50 minutes, with the route covering approximately 856 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
First class seats are offered on the ONT to CPR route with United Airlines.
How do I earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) flight with Expedia?
It's easy to earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Casper from Los Angeles - Ontario Intl. (ONT)?
From Los Angeles - Ontario Intl. (ONT), you can fly into Natrona County Intl. (CPR) to reach Casper. Some flights may connect through major hubs like Salt Lake City Intl. (SLC), Seattle - Tacoma Intl. (SEA), San Francisco Intl. (SFO) before reaching Casper. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) at the last minute?
Typically, booking a last minute flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) flight and hotel package?
Securing a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.)?
If you booked your Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Casper, WY (CPR-Natrona County Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Ontario Intl. Airport
Destination airport
Natrona County Intl.
Airlines serving
United
Roundtrip price
$346
Distance
855 mi

Book with confidence

Ontario Intl. Airport to Casper Flights

The cheapest times to fly from Ontario Intl. Airport to Casper

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario Intl. Airport to Casper are during the month of June. You can find some of the cheapest flights from Ontario Intl. Airport to Casper with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario Intl. Airport to Casper

Sunday is one of the best days to book for cheap flights from Ontario Intl. Airport to Casper: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario Intl. Airport to Casper

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario Intl. Airport to Casper in 2026. You can also book with separate airlines for your outbound and return journeys, from $268 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario Intl. Airport to Casper flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario Intl. Airport to Casper airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Ontario Intl. Airport to Casper Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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