Lowest Prices
Find the lowest ONT airfares by comparing hundreds of airlines and agencies.
Good to Know: Flights to ONT
Useful information for finding cheap flights to Ontario International and booking your next trip
Cheapest Round Trip Flight
$94
Frontier Airlines• 1 stop • 9h 14mOct 26 – Nov 09
The cheapest round trip flight from Denver International to Ontario International is currently $94
Cheapest Direct Flight
$147
Frontier Airlines• nonstop• 3h 40mOct 26
The cheapest nonstop flight from Denver International to Ontario International is currently $147
Fastest Flight
3h 40m
The fastest nonstop flight from Denver International to Ontario International takes 3h 40m
Best Flight Deals to Ontario
Identify the most efficient round-trip flights to Ontario. We present options balancing cost and convenience for your return journey.
Oct 26 - Nov 09, Economy
Denver → Ontario
9h 14m
7:00 AM - 11:54 AM • 1 stop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
16h 57m
6:15 AM - 3:32 PM • 1 stop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
9h 14m
7:00 AM - 11:54 AM • 1 stop
Denver → Ontario
6h 56m
10:43 PM - 3:59 AM • 1 stop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
3h 40m
8:15 AM - 9:35 AM • nonstop
Denver → Ontario
3h 44m
4:05 PM - 7:29 PM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
3h 41m
10:29 PM - 11:50 PM • nonstop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Need to travel to Ontario soon? View current last-minute flight options to ONT for spontaneous or pressing plans.
Oct 26 - Nov 09, Economy
Denver → Ontario
16h 58m
10:29 PM - 7:47 AM • 1 stop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
16h 57m
6:15 AM - 3:32 PM • 1 stop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
13h 34m
8:18 AM - 3:32 PM • 1 stop
Denver → Ontario
3h 44m
4:05 PM - 7:29 PM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
3h 41m
10:29 PM - 11:50 PM • nonstop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
3h 41m
10:29 PM - 11:50 PM • nonstop
Denver → Ontario
6h 56m
10:43 PM - 3:59 AM • 1 stop
Frontier Airlines
Maximize your time in Ontario, not in transit. Discover non-stop direct flights to ONT for the quickest, most straightforward journey to the Strip.
Oct 26 - Nov 09, Economy
Denver → Ontario
3h 40m
8:15 AM - 9:35 AM • nonstop
Denver → Ontario
3h 44m
4:05 PM - 7:29 PM • nonstop
Frontier Airlines
Oct 26 - Nov 09, Economy
Denver → Ontario
3h 41m
10:29 PM - 11:50 PM • nonstop
Denver → Ontario
3h 45m
6:45 AM - 10:10 AM • nonstop
Frontier Airlines
Jan 03 - Jan 07, Economy
Houston → Ontario
5h 42m
8:10 PM - 9:52 PM • nonstop
Houston → Ontario
5h 20m
5:50 AM - 11:10 AM • nonstop
United Airlines
Essential Information for Booking Flights from () - AI Insights
What's the cheapest airline to ont?
To find the cheapest flights to Ontario International, Virgin Atlantic (VS), Air France (AF), Alaska Airlines (AS), WestJet Airlines (WS), Aerolineas Argentinas (AR), and WestJet Airlines (WS) are currently offering some of the most affordable options.
What's the popular airline to fly to ont?
American Airlines (AA) offers popular routes to Ontario International Airport (ont), with a focus on economy class travel.
What's the cheapest day of the week to fly to ont?
Tuesday is the cheapest day to fly to Ontario International.
What's the cheapest month to fly to ont?
April is the cheapest month to fly to Ontario International Airport.
What is the cheapest airline to fly to Ontario International Airport?
Virgin Atlantic (VS), Air France (AF), Alaska Airlines (AS), WestJet Airlines (WS), Aerolineas Argentinas (AR), and American Airlines (AA) typically offer the most affordable fares to Ontario International Airport.
When is it generally cheaper to fly to Ontario International Airport?
April is generally considered to be the cheapest month to fly to Ontario International Airport, often offering the lowest fares.
Which airlines frequently offer deals to Ontario International Airport?
Virgin Atlantic (VS), Air France (AF), Alaska Airlines (AS), WestJet Airlines (WS), and Aerolineas Argentinas (AR) are known for providing competitive fares to Ontario International Airport.
What is the name of the airport in Ontario, Canada?
Ontario International Airport
Destination Airport Information
| IATA Code | ONT |
| Name | Ontario International |
| City | Ontario |
| Country | US |
| Latitude | 34.055999755859375 |
| Longitude | -117.60099792480469 |
Popular Airlines
More Flight Options to Ontario, ONT
Why Fareleaders for Flights to ONT
New Deals Everyday
Never miss a deal on ONT flights—we update prices daily to bring you the best airfares.
Best Travel Options
Compare hundreds of ONT flights and find the best deals without any added service charges.