Question 1

How long does it take to travel from Ontario to Denver?

Accepted Answer

A one-way nonstop (direct) flight between Ontario and Denver takes around 2.4 hours.

Question 2

What is the flight distance between Ontario and Denver?

Accepted Answer

The flight distance between Ontario and Denver is 1317 km.

Question 3

What airlines offer nonstop (direct) flights between Ontario and Denver?

Accepted Answer

Several carriers operate flights between Ontario and Denver. Airlines offering nonstop (direct) flights include Frontier Airlines, United Airlines.

Question 4

What are the most popular routes to and from Ontario?

Accepted Answer

Travelers frequently search for route combinations, such as Ontario and Guadalajara, London, Dallas, Seattle, Las Vegas, San Francisco, Mexico City, Houston, Sacramento, Honolulu, New York, Portland, Chicago, Washington, D.C., Toronto, Orlando, Cancún, Veracruz, Manila, Edmonton.

Question 5

What are the most popular routes to and from Denver?

Accepted Answer

Travelers frequently search for route combinations, such as Denver and London, Mexico City, Chicago, Manchester, Houston, Los Angeles, New York, Washington, D.C., Tokyo, Toronto, Guadalajara, Vancouver, Atlanta, Orlando, Miami, Dallas, Minneapolis, Phoenix, San Diego, San Francisco.

Question 6

What airports are near Ontario?

Accepted Answer

The main airport in Ontario is Ontario International. It is also served by Tijuana International, San Diego International, John Wayne, Ontario International, Hollywood Burbank, Palm Springs International, Santa Barbara Municipal, McClellan–Palomar, Meadows Field, Imperial County.

Question 7

What airports are near Denver?

Accepted Answer

The main airport in Denver is Denver International. It is also served by Eagle County Regional, Colorado Springs, Pueblo Memorial, Cheyenne Regional, Laramie Regional.

Question 8

Which airlines fly between Ontario and Denver?

Accepted Answer

Currently, you can fly between Ontario and Denver with Frontier Airlines, Volaris, United Airlines, VivaAerobus, AeroMéxico.

Question 9

When’s the best time to travel between Ontario and Denver?

Accepted Answer

If you don’t have specific dates for your trip between Ontario and Denver, you can enter a date range into the departure and return fields. Most carriers on the Kiwi.com website allow you to search and book up to six months from the day of your search. Order the search results by the best, cheapest, or fastest route, or find the cheapest outbound and return combination in the pricing table.

Question 10

What flights operate between Ontario and Denver?

Accepted Answer

Traveling between Ontario and Denver, you can choose between direct (nonstop) flights or flights with one or more stops. You can select the number of stops on your journey, including an overnight stopover, and the duration of the stopover. What’s more, you can also select where you want to have your stopover. Want to say "Hi" to a friend in another city en route to your destination? Or fancy a quick round of shopping? Go Multi-City or Nomad and add places to your search that you wish to visit.

Question 11

How many airports are there near Ontario?

Accepted Answer

There are a number of airports in and around Ontario. The main one is Ontario International and other nearby airports include Tijuana International, San Diego International, John Wayne, Ontario International, Hollywood Burbank, Palm Springs International, Santa Barbara Municipal, McClellan–Palomar, Meadows Field, Imperial County

Question 12

How many airports are there near Denver?

Accepted Answer

There are a number of airports in and around Denver. The main one is Denver International and other nearby airports include Eagle County Regional, Colorado Springs, Pueblo Memorial, Cheyenne Regional, Laramie Regional.

Question 13

What time do nonstop (direct) flights between Ontario and Denver depart?

Accepted Answer

This depends on the airline’s flight schedule. You can easily select your preferred departure time when you search on our website or mobile app. Choose the time of day you wish to depart from Ontario, such as morning, afternoon, evening, or night, or select the exact hours for departure.

Question 14

What time do nonstop (direct) flights between Ontario and Denver arrive?

Accepted Answer

This depends on the airline’s flight schedule. You can easily select your preferred arrival time when you search on our website or mobile app. Choose the time of day you wish to arrive at Denver, such as morning, afternoon, evening, or night, or select the exact hours for arrival.

Question 15

What time do flights between Ontario and Denver depart?

Accepted Answer

This depends on the airline’s flight schedule. You can easily select your preferred departure time when you search on our website or mobile app. Choose the time of day you wish to depart from Ontario, such as morning, afternoon, evening, or night, or select the exact hours for departure.

Question 16

What time do flights between Ontario and Denver arrive?

Accepted Answer

This depends on the airline’s flight schedule. You can easily select your preferred arrival time when you search on our website or mobile app. Choose the time of day you wish to arrive at Denver, such as morning, afternoon, evening, or night, or select the exact hours for arrival.

Cheapest one-way trip	£37
Cheapest nonstop round-trip	£209
Cheapest round-trip	£130
Average round-trip	£245
Nonstop flights in June	£134 – £210

Transport Option	Typical Time	Typical Cost	Frequency	Best For
RTD A Line to Union Station	37 min	$10.50; one-way fare	every 15 min (traffic dependent)	downtown on a budget
RTD SkyRide Bus (AF Route)	50-70 min	$10.50; one-way fare	every 30–60 min (traffic dependent)	Boulder and suburban areas
Taxi	30-50 min	$55 – $70; metered; varies by traffic and destination	on-demand 24/7 (traffic dependent)	door-to-door convenience
Ride-hailing (Uber/Lyft)	30-50 min	$40 – $70; surge pricing may apply	on-demand 24/7 (traffic dependent)	flexible pickup locations
Private transfer/shuttle	30-50 min	$70 – $120; pre-booked; varies by provider	by reservation (traffic dependent)	groups and guaranteed pickup
Rental car	30-50 min	$40 – $100; per day; varies by vehicle and provider	on-demand (traffic dependent)	exploring Colorado independently

Airline	Mon 15.06	Tue 16.06	Wed 17.06	Thu 18.06	Fri 19.06	Sat 20.06	Sun 21.06
United Airlines	3	2	3	3	3	2	3
Frontier Airlines	2	2	2	2	2	2	2
Weekly flights: 33 total	Daily flights: 4.71 average	Most flights: Monday 3 flights

Airline	Mon 22.06	Tue 23.06	Wed 24.06	Thu 25.06	Fri 26.06	Sat 27.06	Sun 28.06
United Airlines	3	2	3	2	2	2	2
Frontier Airlines	2	2	2	2	2	2	2
Weekly flights: 30 total	Daily flights: 4.29 average	Most flights: Monday 3 flights

Airline	Mon 29.06	Tue 30.06	Wed 01.07	Thu 02.07	Fri 03.07	Sat 04.07	Sun 05.07
United Airlines	2	2	2	2	2	1	2
Frontier Airlines	2	2	2	2	2	2	2
Weekly flights: 27 total	Daily flights: 3.86 average	Most flights: Monday 2 flights

Cheap flights from Ontario to Denver from £37

Explore flight deals to Denver

Not happy with the results? Try some of our useful filters

Search by stops

Search by carrier

Search by price

Search by departure date

Not happy with the results? Try some of our useful filters

Search by stops

Search by carrier

Search by price

Search by departure date

How much do flights to Denver cost?

Cheapest one-way trip

Cheapest nonstop round-trip

Cheapest round-trip

Average round-trip

Nonstop flights in June

Getting from Denver's airport to the city center

Key info about flying to Denver

Weekly direct flights

Check-in for a flight from Ontario to Denver

Weather in Denver

Average Weather

14 day forecast

Frequently asked questions

Explore alternative trips

Start your next adventure now. Download our app and explore cheap flights effortlessly!

Company

Platform

Features

Discover

Airline	Mon 06.07	Tue 07.07	Wed 08.07	Thu 09.07	Fri 10.07	Sat 11.07	Sun 12.07
United Airlines	2	2	2	2	2	2	2
Frontier Airlines	2	2	2	2	2	2	2
Weekly flights: 28 total	Daily flights: 4 average	Most flights: Monday 2 flights

Name	Carrier code	IATA Code	Passport needed during booking
Frontier Airlines	FFT	F9	No
Volaris	VOI	Y4	No
United Airlines	UAL	UA	No
VivaAerobus	VIV	VB	No
AeroMéxico	AMX	AM	Yes

Month	Average monthly max temperature	Average monthly min temperature
January	4°C	-6°C
February	5°C	-6°C
March	10°C	-1°C
April	14°C	1°C
May	18°C	6°C
June	26°C	13°C
July	29°C	16°C
August	28°C	15°C
September	25°C	12°C
October	17°C	4°C
November	10°C	-1°C
December	5°C	-5°C