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Cheap flights from Ontario to Casper from $378

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Casper departing on 7/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Casper

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
1:18 pm - 9:59 pm
ONT
-
CPR
7h 41m
1 stop
United Airlines Logo
5:15 am - 12:47 pm
CPR
-
ONT
8h 32m
1 stop
$378United Airlines
Thu, Jul 30 - Tue, Aug 4
United Airlines Logo
1:18 pm - 9:59 pm
ONT
-
CPR
7h 41m
1 stop
United Airlines Logo
1:23 pm - 8:42 pm
CPR
-
ONT
8h 19m
1 stop
$468United Airlines
Fri, Jul 10 - Fri, Jul 17
United Airlines Logo
5:00 am - 12:42 pm
ONT
-
CPR
6h 42m
1 stop
United Airlines Logo
9:26 am - 10:37 pm
CPR
-
ONT
14h 11m
2 stops
$479United Airlines
Thu, Jul 30 - Tue, Aug 4
United Airlines Logo
5:00 am - 10:46 am
ONT
-
CPR
4h 46m
1 stop
United Airlines Logo
5:15 am - 12:47 pm
CPR
-
ONT
8h 32m
1 stop
$519United Airlines
Wed, Jul 22 - Mon, Jul 27
United Airlines Logo
5:00 am - 10:46 am
ONT
-
CPR
4h 46m
1 stop
United Airlines Logo
7:05 am - 10:37 pm
CPR
-
ONT
16h 32m
2 stops
$524United Airlines
Wed, Jul 22 - Mon, Jul 27
United Airlines Logo
1:18 pm - 9:59 pm
ONT
-
CPR
7h 41m
1 stop
United Airlines Logo
5:15 am - 12:12 pm
CPR
-
ONT
7h 57m
2 stops
$553United Airlines
Thu, Jul 30 - Mon, Aug 3
United Airlines Logo
5:00 am - 12:42 pm
ONT
-
CPR
6h 42m
1 stop
United Airlines Logo
1:23 pm - 10:37 pm
CPR
-
ONT
10h 14m
2 stops
$562United Airlines
Sun, Jun 28 - Mon, Jun 29
United Airlines Logo
1:18 pm - 9:59 pm
ONT
-
CPR
7h 41m
1 stop
United Airlines Logo
5:15 am - 12:47 pm
CPR
-
ONT
8h 32m
1 stop
$564United Airlines
Thu, Jul 23 - Sun, Jul 26
United Airlines Logo
5:00 am - 10:46 am
ONT
-
CPR
4h 46m
1 stop
United Airlines Logo
1:23 pm - 8:42 pm
CPR
-
ONT
8h 19m
1 stop
$606United Airlines
Sun, Jun 28 - Mon, Jun 29
United Airlines Logo
5:00 am - 9:59 pm
ONT
-
CPR
15h 59m
1 stop
United Airlines Logo
9:26 am - 5:28 pm
CPR
-
ONT
9h 02m
1 stop
$648United Airlines
Thu, Jun 11 - Sun, Jun 14

United Airlines flights from Ontario to Casper

Our best United Airlines deals on Ontario to Casper flight tickets
United Airlines
Jul 30
ONT1:18 pmOntario
7h 41m
1 stop
CPR9:59 pmCasper Natrona County
Aug 4
CPR5:15 amCasper Natrona County
8h 32m
1 stop
ONT12:47 pmOntario
$378
United Airlines
May 14
ONT1:40 pmOntario
7h 30m
1 stop
CPR10:10 pmCasper Natrona County
May 16
CPR5:25 amCasper Natrona County
7h 57m
2 stops
ONT12:22 pmOntario
$424
United Airlines
May 13
ONT1:40 pmOntario
5h 37m
1 stop
CPR8:17 pmCasper Natrona County
May 16
CPR7:10 amCasper Natrona County
11h 42m
2 stops
ONT5:52 pmOntario
$444

momondo 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, momondo users made 832,500 searches. Data last updated May 5, 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

Thu 7/30

1:18 pm-9:59 pm

1 stop7h 41m

Casper Natrona County

Tue 8/4

5:15 am-12:47 pm

1 stop8h 32m

$378

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Fri 7/10

1:18 pm-9:59 pm

1 stop7h 41m

Casper Natrona County

Fri 7/17

1:23 pm-8:42 pm

1 stop8h 19m

$468

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 7/30

5:00 am-12:42 pm

1 stop6h 42m

Casper Natrona County

Tue 8/4

9:26 am-10:37 pm

2 stops14h 11m

$479

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 7/22

5:00 am-10:46 am

1 stop4h 46m

Casper Natrona County

Mon 7/27

5:15 am-12:47 pm

1 stop8h 32m

$519

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Wed 7/22

5:00 am-10:46 am

1 stop4h 46m

Casper Natrona County

Mon 7/27

7:05 am-10:37 pm

2 stops16h 32m

$524

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 7/30

1:18 pm-9:59 pm

1 stop7h 41m

Casper Natrona County

Mon 8/3

5:15 am-12:12 pm

2 stops7h 57m

$553

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Sun 6/28

5:00 am-12:42 pm

1 stop6h 42m

Casper Natrona County

Mon 6/29

1:23 pm-10:37 pm

2 stops10h 14m

$562

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 7/23

1:18 pm-9:59 pm

1 stop7h 41m

Casper Natrona County

Sun 7/26

5:15 am-12:47 pm

1 stop8h 32m

$564
Quickest round-trip

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Sun 6/28

5:00 am-10:46 am

1 stop4h 46m

Casper Natrona County

Mon 6/29

1:23 pm-8:42 pm

1 stop8h 19m

$606

OntarioCasper

ONT - CPR

ONTCPR

Ontario

Thu 6/11

5:00 am-9:59 pm

1 stop15h 59m

Casper Natrona County

Sun 6/14

9:26 am-5:28 pm

1 stop9h 02m

$648

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Ontario to Casper

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Casper according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Casper (ONT to CPR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Casper

Fastest flight time

4h 46m

Direct flights

None
The fastest flight from Ontario to Casper takes 4h 46m
There are no direct flights from Ontario to Casper. There are no popular flight routes from Ontario to Casper.
Search flight deals

Frequently asked questions about flying from Ontario to Casper

  • How far is Ontario to Casper Natrona County by plane?

    The straight-line distance from Ontario to Casper Natrona County is 860.4 mi. In terms of flight time, this usually takes a little over 4h 46m.

  • When did momondo last update prices for flights from Ontario Airport to Casper Natrona County Airport?

    Prices for flights from Ontario Airport to Casper Natrona County Airport were last updated today.

  • How many operators does momondo search for flights from Ontario Airport to Casper Natrona County Airport?

  • How old do you have to be to fly from Ontario Airport to Casper Natrona County Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Casper Natrona County Airport.

  • What documentation or ID do you need to fly to Casper Natrona County Airport?

    The travel and health documents required for your trip to Casper Natrona County Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Casper Natrona County Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Ontario to Casper?

Best airlines flying from Ontario to Casper

Compare and see reviews for airlines that fly from Ontario to Casper with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $318Free CancellationRating
7.4
9,683 reviews
Search United Airlines flights

Frequently asked questions about flying from Ontario to Casper

  • How do I get Price Alerts for flights from Ontario to Casper?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Ontario from Casper. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Ontario to Casper with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near Casper?

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

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Casper?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to Casper for you.

Can I find flights from Ontario to Casper with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to Casper flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to Casper?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Casper.

I’m not ready to book a flight from Ontario to Casper right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Casper, momondo offers a useful price alert feature which will track prices for flights to Casper from Ontario and alert you when they change.

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