Find Cheap Flights from Denver to Ontario (DEN - LAX)

Flights overview

Useful information for finding cheap flights from Denver to Ontario and booking your next trip

Cheapest round-trip flights	$92	Frontier Nonstop 3 hr Sat, May 30 — Mon, Jun 1	The cheapest round-trip flight from Denver to Ontario is currently $92
Cheapest one-way flight	$28	Frontier Nonstop 3 hr Tue, Jun 9	The cheapest one-way flight from Denver to Ontario is currently $28
Last-minute weekend getaway	$232	Frontier 1 stop 12 hr Sat, May 9 — Mon, May 11	The cheapest last-minute weekend getaway from Denver to Ontario is currently $232
Cheapest business class flights	$310	Frontier Nonstop 3 hr Sat, May 30 — Mon, Jun 1	The cheapest business class round-trip flight from Denver to Ontario is currently $310

Fastest flight	2 hr 15 min	The fastest nonstop flight from Denver to Ontario takes 2 hr 15 min
Nonstop flights	Every day	There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from Denver to Ontario is typically January. The most expensive month to fly is typically July.

January Cheapest	Typical prices: $70–210
July Most expensive	Typical prices: $125–180

Popular airlines from Denver to Ontario

Southwest

Nonstop

from $177

Typical price: $185–425

25 weekly nonstop flights

DEN - ONT Every day

1476 weekly connecting flights

DEN - ONT Every day
United

Nonstop

from $177

Typical price: $185–420

14 weekly nonstop flights

DEN - ONT Every day

252 weekly connecting flights

DEN - ONT Every day
Frontier

Nonstop

from $92

Typical price: $95–205

14 weekly nonstop flights

DEN - ONT Every day

50 weekly connecting flights

DEN - ONT Every day
American

from $277

Typical price: $230–495

203 weekly connecting flights

DEN - ONT Every day
Delta

from $197

Typical price: $225–560

82 weekly connecting flights

DEN - ONT Every day
Alaska

from $429

Typical price: $285–660

52 weekly connecting flights

DEN - ONT Every day

Popular airports near Denver

Denver International Airport (DEN)

Denver United States 38 min 19 mi
Colorado Springs Airport (COS)

Colorado Springs United States 1 hr 27 min 66 mi
Centennial Airport (APA)

Denver United States 27 min 14 mi
Eagle County Regional Airport (EGE)

Vail United States 2 hr 19 min 103 mi

Popular airports near Ontario

Ontario International Airport (ONT)

Ontario United States 11 min 2 mi
Los Angeles International Airport (LAX)

Los Angeles United States 1 hr 7 min 44 mi
Tijuana International Airport (TIJ)

Tijuana Mexico 2 hr 16 min 112 mi
San Diego International Airport (SAN)

San Diego United States 1 hr 50 min 95 mi

Frequently asked questions about flying from Denver to Ontario

The cheapest flights from Denver to Ontario are usually in January. Typical ticket prices in January range from $70 to $210.

The cheapest round-trip flight from Denver to Ontario recently found on Google Flights was with Frontier from $92. The cheapest one-way flight was with Frontier from $28.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from Denver to Ontario is $177, flying from May 28 to Jun 1.
The cheapest United flight from Denver to Ontario is $177, flying from May 28 to Jun 1.
The cheapest Frontier flight from Denver to Ontario is $92, flying from May 30 to Jun 1.
The cheapest American flight from Denver to Ontario is $277, flying from May 28 to Jun 1.
The cheapest Delta flight from Denver to Ontario is $197, flying from May 28 to Jun 1.
The cheapest Alaska flight from Denver to Ontario is $429, flying from May 28 to Jun 1.

The cheapest round-trip flight from Denver to Ontario starts at $92 from Sat, May 30 to Mon, Jun 1. The cheapest one-way flight starts at $28 and departs on Tue, Jun 9.

2 hr 15 min is the shortest flight time from Denver to Ontario.

Ontario is a year-round destination, with mild to warm weather for much of the year. Summers (Jun–Aug) tend to be hot, while winters (Dec–Feb) are typically mild. There is a slightly higher chance of rain Jan–Apr. The Road to California (Jan) is a quilt show featuring quilting competitions, classes and exhibits. The city celebrates Independence Day (Jul 4) with a parade, picnic and fireworks display. The Route 66 Cruisin' Reunion (Sep) attracts vintage cars from around the country.

It's easy to use Google Flights to find the cheapest days to fly from Denver to Ontario.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.

What counts as the best airline for your flights from Denver to Ontario really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from Denver to Ontario.

In terms of nonstop flights, Southwest is the most popular. Southwest offers 25 nonstop flights and 1,476 connecting flights per week. Southwest flies from Denver International Airport (DEN) to Ontario International Airport (ONT) .

Other popular airlines flying from Denver to Ontario are:

United offers 14 nonstop flights and 252 connecting flights per week. United flies from Denver International Airport (DEN) to Ontario International Airport (ONT) .
Frontier offers 14 nonstop flights and 50 connecting flights per week. Frontier flies from Denver International Airport (DEN) to Ontario International Airport (ONT) .
American offers 203 connecting flights per week. American flies from Denver International Airport (DEN) to Ontario International Airport (ONT) .
Delta offers 82 connecting flights per week. Delta flies from Denver International Airport (DEN) to Ontario International Airport (ONT) .
Alaska offers 52 connecting flights per week. Alaska flies from Denver International Airport (DEN) to Ontario International Airport (ONT) .

The number of connecting flights refers to distinct flights with at least one stop between Denver and Ontario.

The cheapest round-trip flight from Denver to Ontario recently found on Google Flights was with Frontier from $92. The cheapest one-way flight was with Frontier from $28.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from Denver to Ontario is $177, flying from May 28 to Jun 1.
The cheapest United flight from Denver to Ontario is $177, flying from May 28 to Jun 1.
The cheapest Frontier flight from Denver to Ontario is $92, flying from May 30 to Jun 1.
The cheapest American flight from Denver to Ontario is $277, flying from May 28 to Jun 1.
The cheapest Delta flight from Denver to Ontario is $197, flying from May 28 to Jun 1.
The cheapest Alaska flight from Denver to Ontario is $429, flying from May 28 to Jun 1.

Southwest, Frontier and United fly direct from Denver to Ontario.

There are 25 Southwest direct flights from Denver to Ontario per week. Flights are available every day.
There are 14 United direct flights from Denver to Ontario per week. Flights are available every day.
There are 14 Frontier direct flights from Denver to Ontario per week. Flights are available every day.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

The cheapest last-minute deal between Denver and Ontario at price $232 is offered by Frontier from Sat, May 9 to Mon, May 11.

Southwest, Frontier and United fly direct from Denver to Ontario.

There are 25 Southwest direct flights from Denver to Ontario per week. Flights are available every day.
There are 14 United direct flights from Denver to Ontario per week. Flights are available every day.
There are 14 Frontier direct flights from Denver to Ontario per week. Flights are available every day.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

There are direct flights from Denver to Ontario on a daily basis.

The cheapest direct (nonstop) round-trip flights between Denver and Ontario start at $92 from Sat, May 30 to Mon, Jun 1 with Frontier.

It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Denver to Ontario, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.

The cheapest business class round-trip flights between Denver and Ontario start at $310 from Sat, May 30 to Mon, Jun 1 with Frontier.

The cheapest economy class round-trip flights between Denver and Ontario start at $92 from Sat, May 30 to Mon, Jun 1.

To book business class trips from Denver to Ontario, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.

The best last-minute getaway deal for the next weekend between Denver and Ontario starts at $232 from Sat, May 9 to Mon, May 11 with Frontier.

The cheapest last-minute deal between Denver and Ontario at price $232 is offered by Frontier from Sat, May 9 to Mon, May 11.

To find last-minute flight deals from Denver to Ontario, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.