$265 Cheap Flights from Gillette (GCC) to Ontario (ONT)

View $265 flight on Mon, Oct 20, 2025Opens in a new window

Popular airlines from Gillette, WY (GCC-Campbell County) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Gillette to Ontario (GCC-ONT)

Prices were available within the past 7 days and start at $265 for one-way flights and $318 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Dec 7 - Thu, Dec 25
GCC
Gillette
ONT
Ontario
$318 Roundtrip, found 11 hours ago
$318
Roundtrip
found 11 hours ago
Select United flight, departing Sun, Dec 7 from Gillette to Ontario, returning Thu, Dec 25, priced at $318 found 11 hours ago
United
Thu, Nov 27 - Thu, Dec 4
GCC
Gillette
ONT
Ontario
$324 Roundtrip, found 10 hours ago
$324
Roundtrip
found 10 hours ago
Select United flight, departing Thu, Nov 27 from Gillette to Ontario, returning Thu, Dec 4, priced at $324 found 10 hours ago
United
Wed, Dec 10 - Mon, Jan 5
GCC
Gillette
ONT
Ontario
$325 Roundtrip, found 8 hours ago
$325
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Dec 10 from Gillette to Ontario, returning Mon, Jan 5, priced at $325 found 8 hours ago
United
Fri, Oct 17 - Fri, Nov 7
GCC
Gillette
ONT
Ontario
$333 Roundtrip, found 11 hours ago
$333
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Oct 17 from Gillette to Ontario, returning Fri, Nov 7, priced at $333 found 11 hours ago
United
Wed, Dec 10 - Mon, Jan 5
GCC
Gillette
ONT
Ontario
$353 Roundtrip, found 8 hours ago
$353
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Dec 10 from Gillette to Ontario, returning Mon, Jan 5, priced at $353 found 8 hours ago
United
Sat, Dec 6 - Thu, Dec 25
GCC
Gillette
ONT
Ontario
$369 Roundtrip, found 11 hours ago
$369
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Dec 6 from Gillette to Ontario, returning Thu, Dec 25, priced at $369 found 11 hours ago
United
Tue, Oct 7 - Thu, Oct 23
GCC
Gillette
ONT
Ontario
$373 Roundtrip, found 11 hours ago
$373
Roundtrip
found 11 hours ago
Select United flight, departing Tue, Oct 7 from Gillette to Ontario, returning Thu, Oct 23, priced at $373 found 11 hours ago
United
Thu, Nov 27 - Thu, Dec 11
GCC
Gillette
ONT
Ontario
$374 Roundtrip, found 11 hours ago
$374
Roundtrip
found 11 hours ago
Select United flight, departing Thu, Nov 27 from Gillette to Ontario, returning Thu, Dec 11, priced at $374 found 11 hours ago
United
Tue, Oct 7 - Wed, Oct 22
GCC
Gillette
ONT
Ontario
$379 Roundtrip, found 11 hours ago
$379
Roundtrip
found 11 hours ago
Select United flight, departing Tue, Oct 7 from Gillette to Ontario, returning Wed, Oct 22, priced at $379 found 11 hours ago
United
Fri, Oct 3 - Thu, Oct 23
GCC
Gillette
ONT
Ontario
$383 Roundtrip, found 11 hours ago
$383
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Oct 3 from Gillette to Ontario, returning Thu, Oct 23, priced at $383 found 11 hours ago

Alternative airports near Ontario

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

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $604
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $604

Frequently asked questions

How much does a flight from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Get a cheap one-way flight from $265 or cheap return flight from $318 from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT)?
December is the cheapest month to fly from GCC to ONT. Traveling during quieter months is often the key to finding better fares.
What is the cheapest airline that flies from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT)?
To find the cheapest airline that'll fly you from GCC to ONT, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll have to take a flight with a layover when traveling from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT). There are no daily direct flights on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from GCC to ONT?
Usually you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT)?
Choose a flight from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT) that takes off before 3 PM to reduce the likelihood of delays. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Booking your flight from GCC to ONT shortly before your trip is generally more expensive. But if you're flexible with your schedule, you could bag a cheap last-minute fare.
Is it cheaper to book a GCC to ONT flight and hotel package?
You can save money by securing a GCC to ONT flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've selected your preferred flights and accommodations, consider adding extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from Campbell County Airport (GCC) to Los Angeles - Ontario Intl. Airport (ONT)?
It's usually possible to cancel or reschedule your GCC to ONT flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Campbell County
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
United
Roundtrip price
$318
Distance
957 mi

Book with confidence

Book with confidence

Gillette to Ontario Flights

The cheapest times to fly from Gillette to Ontario

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 Gillette to Ontario are during the month of December. You can find some of the cheapest flights from Gillette to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Gillette to Ontario

Sunday is one of the best days to book for cheap flights from Gillette to Ontario: 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 Gillette to Ontario

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 Gillette to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $265 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 Gillette to Ontario 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 Gillette to Ontario 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.

 

Gillette to Ontario Flights

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*Available to One Key members.