$78 Cheap Flights from United States to Ontario International
One-way
Departing from
United States
Going to
Ontario International
Ontario (ONT)
United States • April, 2026
87% AI deal score
$285 $78
Ontario (ONT)
United States • April, 2026
87% AI deal score
$285 $78
Ontario (ONT)
United States • April, 2026
87% AI deal score
$285 $79
Ontario (ONT)
United States • May, 2026
87% AI deal score
$285 $79
Top Cheap Flight Deals from United States to Ontario International
Recent round-trip flight deals to Ontario International
Wed, Apr 8 - Thu, Apr 9
Cheapest
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$80
$56
-$24
30%
Wed, Apr 8 - Thu, Apr 9
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$80
$56
-$24
30%
Wed, Apr 8 - Tue, Apr 21
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$80
$61
-$19
24%
Wed, Apr 8 - Wed, Apr 22
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$80
$61
-$19
24%
Wed, Apr 8 - Tue, Apr 28
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$80
$61
-$19
24%
Wed, Apr 8 - Tue, May 5
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$80
$61
-$19
24%
The cheapest time to fly to Ontario International
Ready to jet to Ontario International on a budget? Check out these popular routes with surprisingly cheap fares (one-way prices):
Last-Minute Flights from United States to Ontario International
Need to get to Ontario International ASAP? Even if you're booking a flight on short notice, there are often last-minute deals available:
Next 2 weeks deals
Last Minute Flight Deals
We found flight deals departing in the next two weeks for as low as $555.
⌛ Last-Minute
San Francisco - ONT
A great last-minute steal for a cross-country flight.
Found 1 week ago
$1532
round-trip
Facts About Flights from United States to Ontario
To help you plan your journey, here are some quick Ontario flight facts and tips.
Ontario airports
Ontario International Airport (ONT): A Gateway to Southern California Located in the heart of Southern California, Ontario International Airport (ONT) offers a convenient and increasingly popular alternative to the larger and often more congested Los Angeles International Airport (LAX). ONT boasts a growing list of domestic and international destinations, served by a variety of airlines. Passengers appreciate its modern facilities, shorter security lines, and overall ease of navigation. The airport is easily accessible via major freeways and offers ample parking options, making it a stress-free starting point or arrival point for your travels. Whether you're visiting the Inland Empire, heading to nearby attractions, or connecting to destinations around the globe, Ontario International Airport provides a smooth and efficient travel experience.
Pro tip: search “Ontario (Any)” to see fares to all Ontario airports – sometimes one is cheaper than the others on your dates.
Insights for flights to Ontario International
Cheapest airport
Hamilton (YHM)
Looking for a low-key Ontario adventure? Hamilton Airport (YHM) might be your golden ticket! While it's smaller than Toronto Pearson, YHM offers a relaxed vibe and budget-friendly flights, making it a smart choice for savvy travelers. Plus, you're perfectly positioned to explore Hamilton's waterfalls and vibrant arts scene, or take a quick trip to Niagara Falls!
Nonstop vs. 1-stop
20+ cities
Ontario International Airport (ONT) is a secondary airport in the Los Angeles Metropolitan area, and it offers a variety of routes, with popular connections to cities like Sacramento, San Francisco, and Denver, making it a convenient option for travelers looking to bypass the hustle of LAX.
Number of airlines
ONT Airport Deal Stats
Current most discounted routes
Avg. most discounted routes (last 3 months)
ONT airport insights
Best days to catch a deal
Wed, Tue
Based on the data, Sunday is the best day to find flight deals from Ontario International Airport. Saturday also appears to be a good day to search for discounted flights.
Avg. deal survival time
17.4 hours
Deals from Ontario International airport typically last about 17.4 hours. This means that the best fares disappear relatively quickly, so it's important to book fast.
Rare deal frequency
11 deals
We found 11 rare deals for flights to Ontario International Airport in the past month. These rare deals had an AI Deal Score of 90+ and usually consist of mistake fares, special promotions, or ultra-discounts.
Average price drop
-31%
On average, flights into Ontario International Airport see a price drop of 31.1%, offering significant savings for travelers. This makes Ontario a potentially cost-effective destination compared to other airports.
Next 4 weeks: deal forecast
Ontario International Airport Next Month Forecast
Based on current trends, flight prices to Ontario International Airport are expected to remain stable next month. There are no significant price drops or increases anticipated in the near future.
Top 5 biggest price drops (last 3 months)
Found on March 25
Twin Falls - ONT
$705 → $120
83%
Found on March 23
Bangkok - ONT
$995 → $495
50%
Found on March 18
Brisbane - ONT
$3,550 → $1,847
48%
Found on March 22
Grand Island - ONT
$1,500 → $789
47%
Found on March 20
Pago Pago - ONT
$2,675 → $1,515
43%
Check these nearby airports too
Looking for more options? These airports near ONT sometimes drop rare deals too:
Los Angeles International (LAX)
~10 rare deals/month
San Diego International (SAN)
~14 rare deals/month
John Wayne (SNA)
~9 rare deals/month
If you’re flexible with departure cities, it’s worth keeping an eye on nearby airports — especially LAX and SAN for long-haul deal surprises.
When Is the Best Time to Fly from United States to Ontario International
Timing is everything when hunting for cheap flights. Here are data-backed insights on the best times to fly to Ontario International:
Cheapest month
January
Cheapest month
January is often the cheapest month to fly to Ontario, offering budget-friendly travel options. The city experiences cooler temperatures and fewer tourists during this time. You can explore Ontario's attractions without the crowds and enjoy potential savings on flights and accommodations.
Best day to book
Tuesday
Best day to book
Booking your flight on a Tuesday can often lead to significant savings. Airlines frequently release deals and discounts at the beginning of the week. By monitoring prices and booking on a Tuesday, you increase your chances of securing a cheaper flight to Ontario.
Cheapest days to fly
Wednesday
Cheapest days to fly
Flying to Ontario on a Wednesday is typically the most economical choice. Mid-week flights tend to be less expensive due to lower demand from business travelers. Opting for a Wednesday arrival can free up your budget for enjoying the many attractions Ontario has to offer.
Advance booking sweet spot
2 months
Advance booking sweet spot
The sweet spot for booking flights to Ontario is about two months in advance. This timeframe often strikes a balance between availability and price. Booking around two months out allows you to secure your preferred flight times and potentially snag a better deal before prices start to climb closer to the departure date.
Ontario International Airports & Ground Transportation
One big question for travelers is which Ontario International airport to fly into. Here’s a quick guide to Ontario International’s airports and how to get to the city from each:
Ontario International Airport (ONT)
Ontario International Airport (ONT) is a convenient gateway to Southern California, offering a less hectic alternative to the bustling LAX. With two terminals, it provides a range of amenities including dining and shopping options to keep you occupied before your flight. The airport is located just about 4 miles east of downtown Ontario, making it super accessible. Getting to and from the city is a breeze with readily available taxis, ride-sharing services, and rental cars. Plus, the Metrolink train offers a direct connection for a smooth journey.
Tip: Arrive a little early to explore the local eateries; you might find your new favorite pre-flight snack!
Los Angeles International Airport (LAX)
Los Angeles International Airport (LAX) is one of the world's busiest airports. It offers tons of international and domestic flights. Located about 38 miles west of Ontario, it's a major hub with a vast array of shops, restaurants, and lounges. Getting to Ontario from LAX requires a bit of planning, with options like the FlyAway bus to Union Station followed by a Metrolink train, or ride-sharing and taxi services for a more direct route. Be sure to factor in LA's infamous traffic!
What to Do in Ontario
Ontario isn’t just about getting there – it’s about enjoying the country once you arrive! Here are some top things to do in Ontario, organized by interest:
Sightseeing & landmarks
Ontario is filled with many sightseeing and landmarks options. From historic buildings to natural wonders, there is something to see for everyone! If you're into architecture, nature, or history, Ontario has it all!
Arts & culture
If you're an art lover, Ontario has many galleries and museums for you to explore, such as the Art Gallery of Ontario! And if you're into performing arts, check out a show at one of the many theaters and music venues.
Food & nightlife
Foodies, rejoice! Ontario has a diverse culinary scene, from farm-to-table restaurants to international cuisine. When the sun goes down, Ontario's nightlife comes alive with bars, clubs, and live music venues!
Shopping & fashion
Shopaholics, get ready to shop 'til you drop! Ontario has a mix of trendy boutiques, high-end department stores, and outlet malls.
Nearby getaways
Need a break from the city? Ontario has many nearby getaways, like Niagara Falls or Prince Edward County! Whether you're looking for a relaxing spa weekend, wine country escape, or outdoorsy adventure, Ontario has many options!
No matter your interest – be it art, food, nightlife, or nature – Ontario has something for everyone. And the best part? Many events and attractions refresh throughout the year, so there’s always something new to experience each visit.
Events in Ontario This Month
jazz fest: a black history celebration - city of fontana california
The annual Jazz Fest: A Black History Celebration is a vibrant community event honoring the rich legacy of jazz music and its profound impact on Black History. This event features live music, dance performances, and educational exhibits that celebrate Black culture and heritage.
fire and ice 2026
The Circle City Rotary is excited to announce the 11th Annual Fire & Ice Chili Cook-Off and Craft Beer Festival! This popular event features a chili competition, craft beer vendors, live entertainment, and family-friendly activities. Attendees can sample a variety of chili recipes and craft beers while supporting the Rotary's charitable initiatives.
erin stevenson
The City of Fontana invites you to Jazz Fest: A Black History Celebration! This lively, family-friendly event honors Black culture through music, art, and community engagement. Enjoy live jazz performances, art displays, food vendors, and activities for all ages as we celebrate Black History Month.
dj supajames
Born and raised in Palm Springs, California, “Supa” James developed a passion for music and entertainment at a young age. He began DJ’ing and spending time at his local radio station, honing his skills and developing his unique style. Now, he brings his talent and energy to events across the region.
Ontario Weather
Weather in Ontario
Wed, Mar 25
0%
30° 14°
0%
Thu, Mar 26
Frequently Asked Questions About Flights to Ontario International
Pro Tips for Finding Cheap Flights to Ontario International
Finally, to wrap up, here’s a cheat sheet of pro tips that experienced travelers use to save on Ontario International flights:
Be Flexible with Your Dates: Flying on Tuesdays or Wednesdays is often cheaper than flying on weekends. Plus, who doesn't love a mid-week getaway?
Consider Alternative Airports: Ontario International Airport (ONT) isn't the only option! Check flights into nearby airports like LAX or even smaller regional ones for potential savings.
