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Cheap flights from Ontario to Casper from $268

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Casper departing on 10/16. 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
1 adult, Economy, 0 bags

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 - 6:59 pmONT  Ontario-CPR Casper Natrona County
4h 41m1 stop Denver Intl
United Airlines Logo
3:11 pm - 8:58 pmCPR  Casper Natrona County-ONT Ontario
6h 47m1 stop Denver Intl
$388United Airlines
Sat, Sep 19 - Sat, Sep 26
United Airlines Logo
5:00 am - 10:53 amONT  Ontario-CPR Casper Natrona County
4h 53m1 stop Denver Intl
United Airlines Logo
7:00 am - 5:47 pmCPR  Casper Natrona County-ONT Ontario
11h 47m2 stops Denver Intl San Francisco
$394United Airlines
Tue, Dec 8 - Sat, Dec 12
United Airlines Logo
1:56 pm - 9:59 pmONT  Ontario-CPR Casper Natrona County
7h 03m2 stops San Francisco Denver Intl
United Airlines Logo
3:11 pm - 10:59 pmCPR  Casper Natrona County-ONT Ontario
8h 48m2 stops Denver Intl San Francisco
$399United Airlines
Sat, Sep 19 - Sat, Sep 26
United Airlines Logo
1:22 pm - 7:09 pmONT  Ontario-CPR Casper Natrona County
4h 47m1 stop Denver Intl
United Airlines Logo
8:45 am - 12:46 pmCPR  Casper Natrona County-ONT Ontario
5h 01m1 stop Denver Intl
$418United Airlines
Sat, Oct 10 - Sun, Oct 11
United Airlines Logo
11:10 am - 10:04 pmONT  Ontario-CPR Casper Natrona County
9h 54m2 stops San Francisco Denver Intl
United Airlines Logo
8:45 am - 12:46 pmCPR  Casper Natrona County-ONT Ontario
5h 01m1 stop Denver Intl
$423United Airlines
Sat, Oct 10 - Sun, Oct 11
United Airlines Logo
1:18 pm - 8:27 pmONT  Ontario-CPR Casper Natrona County
6h 09m1 stop Denver Intl
United Airlines Logo
1:20 pm - 8:58 pmCPR  Casper Natrona County-ONT Ontario
8h 38m1 stop Denver Intl
$433United Airlines
Wed, Sep 23 - Sun, Sep 27
United Airlines Logo
6:00 am - 10:12 pmONT  Ontario-CPR Casper Natrona County
15h 12m2 stops San Francisco Denver Intl
United Airlines Logo
11:25 am - 11:06 pmCPR  Casper Natrona County-ONT Ontario
12h 41m2 stops Denver Intl San Francisco
$444United Airlines
Tue, Dec 8 - Sat, Dec 12
United Airlines Logo
5:00 am - 10:53 amONT  Ontario-CPR Casper Natrona County
4h 53m1 stop Denver Intl
United Airlines Logo
9:10 am - 12:33 pmCPR  Casper Natrona County-ONT Ontario
4h 23m1 stop Denver Intl
$479United Airlines
Tue, Dec 8 - Sat, Dec 12
United Airlines Logo
1:18 pm - 8:27 pmONT  Ontario-CPR Casper Natrona County
6h 09m1 stop Denver Intl
United Airlines Logo
5:15 am - 3:22 pmCPR  Casper Natrona County-ONT Ontario
11h 07m2 stops Denver Intl San Francisco
$484United Airlines
Wed, Sep 23 - Sun, Sep 27
United Airlines Logo
5:00 am - 10:48 amONT  Ontario-CPR Casper Natrona County
4h 48m1 stop Denver Intl
United Airlines Logo
1:20 pm - 10:51 pmCPR  Casper Natrona County-ONT Ontario
10h 31m2 stops Denver Intl San Francisco
$508United Airlines
Fri, Oct 2 - Fri, Oct 9

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United Airlines flights from Ontario to Casper

Our best United Airlines deals on Ontario to Casper flight tickets
United Airlines
Sep 19
ONT1:18 pmOntario
4h 41m
1 stop
CPR6:59 pmCasper Natrona County
Sep 26
CPR3:11 pmCasper Natrona County
6h 47m
1 stop
ONT8:58 pmOntario
$388
United Airlines
Dec 8
ONT5:00 amOntario
4h 53m
1 stop
CPR10:53 amCasper Natrona County
Dec 12
CPR7:00 amCasper Natrona County
11h 47m
2 stops
ONT5:47 pmOntario
$394
United Airlines
Sep 19
ONT1:56 pmOntario
7h 03m
2 stops
CPR9:59 pmCasper Natrona County
Sep 26
CPR3:11 pmCasper Natrona County
8h 48m
2 stops
ONT10:59 pmOntario
$399

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 August 13, 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 Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Sat 9/19

1:18 pm-6:59 pm

1 stop4h 41m

Casper Natrona County

Sat 9/26

3:11 pm-8:58 pm

1 stop6h 47m

$388

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Tue 12/8

5:00 am-10:53 am

1 stop4h 53m

Casper Natrona County

Sat 12/12

7:00 am-5:47 pm

2 stops11h 47m

$394

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Sat 9/19

1:56 pm-9:59 pm

2 stops7h 03m

Casper Natrona County

Sat 9/26

3:11 pm-10:59 pm

2 stops8h 48m

$399

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Sat 10/10

1:22 pm-7:09 pm

1 stop4h 47m

Casper Natrona County

Sun 10/11

8:45 am-12:46 pm

1 stop5h 01m

$418

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Sat 10/10

11:10 am-10:04 pm

2 stops9h 54m

Casper Natrona County

Sun 10/11

8:45 am-12:46 pm

1 stop5h 01m

$423

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Wed 9/23

1:18 pm-8:27 pm

1 stop6h 09m

Casper Natrona County

Sun 9/27

1:20 pm-8:58 pm

1 stop8h 38m

$433

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Tue 12/8

6:00 am-10:12 pm

2 stops15h 12m

Casper Natrona County

Sat 12/12

11:25 am-11:06 pm

2 stops12h 41m

$444
Quickest round-trip

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Tue 12/8

5:00 am-10:53 am

1 stop4h 53m

Casper Natrona County

Sat 12/12

9:10 am-12:33 pm

1 stop4h 23m

$479

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Wed 9/23

1:18 pm-8:27 pm

1 stop6h 09m

Casper Natrona County

Sun 9/27

5:15 am-3:22 pm

2 stops11h 07m

$484

OntarioCasper

ONT Ontario - CPR Casper Natrona County

ONTCPR

Ontario

Fri 10/2

5:00 am-10:48 am

1 stop4h 48m

Casper Natrona County

Fri 10/9

1:20 pm-10:51 pm

2 stops10h 31m

$508

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Casper from

How to get the cheapest flight ticket from Ontario to Casper

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Ontario to Casper Natrona County?

United Airlines is the most popular carrier operating from Ontario to Casper Natrona County

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 47m

Direct flights

None
The fastest flight from Ontario to Casper takes 4h 47m
There are no direct flights from Ontario to Casper. There are no popular flight routes from Ontario to Casper.
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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 47m.

  • 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 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.

Traveling to a place near Casper?

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

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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