$31 Cheap Flights to Ontario
One-way
Departing from
United States
Going to
Ontario, United States
Ontario (ONT)
United States • April, 2026
87% AI deal score
$285 $79
Ontario (ONT)
United States • April, 2026
86% AI deal score
$310 $89
Ontario (ONT)
United States • February, 2026
85% AI deal score
$445 $70
Ontario (ONT)
United States • May, 2026
85% AI deal score
$285 $79
Top Cheap Flight Deals from United States to Ontario
Recent round-trip flight deals to Ontario
Fri, Jan 16 - Sun, Jan 18
Cheapest
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$73
$58
-$15
21%
Thu, Jan 15 - Sun, Jan 18
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$73
$58
-$15
21%
Sat, Feb 14 - Tue, Feb 17
Denver (DEN) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Denver (DEN)
Frontier Airlines airlines • Direct
$85
$58
-$27
32%
Wed, Jan 14 - Sat, Jan 17
Denver (DEN) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Denver (DEN)
Frontier Airlines airlines • Direct
$85
$58
-$27
32%
Thu, Jan 15 - Sun, Jan 18
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$73
$58
-$15
21%
Thu, Jan 15 - Mon, Jan 19
Las Vegas (LAS) - Ontario (ONT)
Frontier Airlines airlines • Direct
Ontario (ONT) - Las Vegas (LAS)
Frontier Airlines airlines • Direct
$73
$58
-$15
21%
The cheapest time to fly to Ontario
Ready to jet to Ontario on a budget? Check out these popular routes with surprisingly cheap fares (one-way prices):
Facts About Flights from United States to Ontario
To help you plan your journey, here are some quick Ontario flight facts and tips.
Ontario city 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
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
Tue, Sun
Based on the provided data, Thursday and Wednesday appear to be the best days to find flight deals from Ontario International Airport. Tuesday and Sunday had the highest counts of cheapest deals, so those days may be more expensive to fly.
Avg. deal survival time
11.7 hours
Deals from Ontario International Airport survive on average for 11.7 hours. Therefore, you should book quickly once you find a deal that works for you.
Rare deal frequency
3 deals
We found 3 rare deals for flights to Ontario International Airport in the past month. These rare deals had an AI Deal Score of 90+ and are usually mistake fares, special promotions, or ultra-discounts.
Average price drop
-65%
On average, prices drop by 65.3% for flights to Ontario International Airport. This means you have a high chance of securing a deal if you wait for price reductions to this airport.
Next 4 weeks: deal forecast
Ontario International Airport Forecast
Based on current data, flight prices to Ontario International Airport are expected to remain relatively stable next month. There are no significant price drops or increases currently anticipated for February 2026.
Top 5 biggest price drops (last 3 months)
Found on December 28
Inverness - ONT
$2,700 → $417
85%
Found on December 27
San Salvador - ONT
$1,265 → $209
83%
Found on December 27
Anchorage - ONT
$720 → $145
80%
Found on December 30
San Pedro Sula - ONT
$725 → $152
79%
Found on December 30
Grand Island - ONT
$825 → $171
79%
Check these nearby airports too
Looking for more options? These airports near ONT sometimes drop rare deals too:
Los Angeles International (LAX)
~6 rare deals/month
Palm Springs International (PSP)
~9 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 PSP for long-haul deal surprises.
When Is the Best Time to Fly from United States to Ontario
Timing is everything when hunting for cheap flights. Here are data-backed insights on the best times to fly to Ontario:
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 Airports & Ground Transportation
One big question for travelers is which Ontario airport to fly into. Here’s a quick guide to Ontario’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
projekt x
Find tickets to see Projekt X at Tukut Lounge in Yaamava' Resort & Casino in Highland on December 31, 2025, at 9:00 PM for a night of unforgettable music and entertainment.
hernandez cc | winter camp #2 | 7:30am-6:00pm | 6-12yr
The Winter Break Day Camp offers three full days of fun activities for children ages 6-12. Campers will enjoy arts and crafts, sports, games, and other engaging organized activities throughout the break.
dj supajames
Born and raised in Palm Springs, California, Supa James developed a passion for music and entertainment early on. His journey began with DJ'ing and spending time at his local radio station, where he honed his skills and love for the craft.
st. bernardine certified farmers market
This year-round market is open every Wednesday from 9:30 AM to 1:00 PM at 210 N. Waterman Avenue, offering a variety of fresh produce and local goods.
Ontario Weather
Weather in Ontario
Fri, Jan 2
35%
17° 11°
35%
Sat, Jan 3
Frequently Asked Questions About Flights to Ontario
Pro Tips for Finding Cheap Flights to Ontario
Finally, to wrap up, here’s a cheat sheet of pro tips that experienced travelers use to save on Ontario 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.
