ONT to DEN

Ontario to Denver flight ticket price

Compare fares, departure times, stops and baggage details for this route, then open the full search when you are ready to check current availability and complete booking.

ONT
Ontario (ONT), United StatesOntario International
DEN
Denver (DEN), United StatesDenver International
Search

Live flights for Sat, 06 Jun 2026

Review fares, stops, timings and baggage. Use Search or View all flights for the complete search result.

Showing flight options for the selected travel date.
Currency: USD
Sat, 06 JunONT to DEN$614 Sun, 07 JunONT to DEN Mon, 08 JunONT to DEN Tue, 09 JunONT to DEN Wed, 10 JunONT to DEN Thu, 11 JunONT to DEN Fri, 12 JunONT to DEN
Sort By:DepartureDurationArrivalPrice
United Airlines
United Airlines
UA-2446
05:00
2026-06-06
Ontario (ONT)United StatesOntario International
2H :20 M
Non Stop
08:20
2026-06-06
Denver (DEN)United StatesDenver International
$614
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
United Airlines
United Airlines
UA-1263
13:18
2026-06-06
Ontario (ONT)United StatesOntario International
2H :20 M
Non Stop
16:38
2026-06-06
Denver (DEN)United StatesDenver International
$614
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
Delta Air Lines
Delta Air Lines
DL-2708
06:00
2026-06-06
Ontario (ONT)United StatesOntario International
4H :45 M
1 Stop
SLC · 1h 25mSalt Lake City (SLC), United States
11:45
2026-06-06
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
United Airlines
United Airlines
UA-2363
06:00
2026-06-06
Ontario (ONT)United StatesOntario International
5H :22 M
1 Stop
SFO · 1h 06mSan Francisco (SFO), United States
12:22
2026-06-06
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
Delta Air Lines
Delta Air Lines
DL-1006
13:29
2026-06-06
Ontario (ONT)United StatesOntario International
4H :46 M
1 Stop
SLC · 1h 22mSalt Lake City (SLC), United States
19:15
2026-06-06
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
Delta Air Lines
Delta Air Lines
DL-3840
13:35
2026-06-06
Ontario (ONT)United StatesOntario International
9H :15 M
1 Stop
SEA · 3h 26mSeattle (SEA), United States
23:50
2026-06-06
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
United Airlines
United Airlines
UA-1375
13:40
2026-06-06
Ontario (ONT)United StatesOntario International
5H :34 M
1 Stop
SFO · 1h 18mSan Francisco (SFO), United States
20:14
2026-06-06
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
United Airlines
United Airlines
UA-1375
13:40
2026-06-06
Ontario (ONT)United StatesOntario International
8H :04 M
1 Stop
SFO · 3h 51mSan Francisco (SFO), United States
22:44
2026-06-06
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
United Airlines
United Airlines
UA-5624
18:39
2026-06-06
Ontario (ONT)United StatesOntario International
5H :08 M
1 Stop
SFO · 0h 51mSan Francisco (SFO), United States
00:47
2026-06-07
Denver (DEN)United StatesDenver International
$624
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included
American Airlines
American Airlines
AA-1194
06:10
2026-06-06
Ontario (ONT)United StatesOntario International
4H :19 M
1 Stop
PHX · 0h 57mPhoenix (PHX), United States
11:29
2026-06-06
Denver (DEN)United StatesDenver International
$649
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
American Airlines
American Airlines
AA-2244
13:11
2026-06-06
Ontario (ONT)United StatesOntario International
4H :05 M
1 Stop
PHX · 0h 51mPhoenix (PHX), United States
18:16
2026-06-06
Denver (DEN)United StatesDenver International
$649
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
Alaska Airlines
Alaska Airlines
AS-607
06:00
2026-06-06
Ontario (ONT)United StatesOntario International
7H :01 M
1 Stop
SEA · 1h 12mSeattle (SEA), United States
14:01
2026-06-06
Denver (DEN)United StatesDenver International
$684
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
Alaska Airlines
Alaska Airlines
AS-1333
11:15
2026-06-06
Ontario (ONT)United StatesOntario International
6H :10 M
1 Stop
PDX · 1h 00mPortland (PDX), United States
18:25
2026-06-06
Denver (DEN)United StatesDenver International
$684
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
Alaska Airlines
Alaska Airlines
AS-654
12:04
2026-06-06
Ontario (ONT)United StatesOntario International
8H :47 M
1 Stop
SEA · 3h 06mSeattle (SEA), United States
21:51
2026-06-06
Denver (DEN)United StatesDenver International
$684
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
Alaska Airlines
Alaska Airlines
AS-625
16:03
2026-06-06
Ontario (ONT)United StatesOntario International
6H :56 M
1 Stop
SEA · 1h 15mSeattle (SEA), United States
23:59
2026-06-06
Denver (DEN)United StatesDenver International
$684
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
American Airlines
American Airlines
AA-1412
05:45
2026-06-06
Ontario (ONT)United StatesOntario International
6H :00 M
1 Stop
DFW · 0h 44mDallas (DFW), United States
12:45
2026-06-06
Denver (DEN)United StatesDenver International
$839
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
American Airlines
American Airlines
AA-2893
07:00
2026-06-06
Ontario (ONT)United StatesOntario International
6H :21 M
1 Stop
DFW · 1h 06mDallas (DFW), United States
14:21
2026-06-06
Denver (DEN)United StatesDenver International
$839
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
American Airlines
American Airlines
AA-2238
10:22
2026-06-06
Ontario (ONT)United StatesOntario International
5H :58 M
1 Stop
DFW · 0h 43mDallas (DFW), United States
17:20
2026-06-06
Denver (DEN)United StatesDenver International
$885
total fare
Non Refundable 7 Seat Left Economy
Cabin: Included
Delta Air Lines
Delta Air Lines
DL-1006
13:29
2026-06-06
Ontario (ONT)United StatesOntario International
5H :11 M
1 Stop
SLC · 1h 39mSalt Lake City (SLC), United States
19:40
2026-06-06
Denver (DEN)United StatesDenver International
$1,041
total fare
Non Refundable 9 Seat Left Economy
Cabin: Included

Recommended hotels in Denver

Stay options near the arrival city for the same travel date.

Search hotels
DIA Layover
3.0Very GoodLive availability

DIA Layover

- 4383 Jebel Street 80249 Denver (CO) Colorado USA,

Free WiFiACBreakfast
Room availability is checked live
$78per night+ taxes if applicable

1 Night • 3 Star

Super 8 by Wyndham Westminster Denver North
2.0Very GoodLive availability

Super 8 by Wyndham Westminster Denver North

- 12055 Melody Dr, Westminster, CO 80234 ,

Free WiFiACBreakfast
Room availability is checked live
$85per night+ taxes if applicable

1 Night • 2 Star

Days Inn by Wyndham Thornton
2.0Very GoodLive availability

Days Inn by Wyndham Thornton

- 12101 N. Grant St. ,

Free WiFiACBreakfast
Room availability is checked live
$87per night+ taxes if applicable

1 Night • 2 Star

La Quinta Inn by Wyndham Denver Northglenn
3.0Very GoodLive availability

La Quinta Inn by Wyndham Denver Northglenn

- 345 W 120th Ave, Westminster, CO 80234 ,

Free WiFiACBreakfast
Room availability is checked live
$91per night+ taxes if applicable

1 Night • 3 Star

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Fare highlights

Selected flight highlights for 06 Jun 2026.

Open full search
Lowest fare $614 United Airlines 05:00
Earliest departure $614 United Airlines 05:00
Shortest duration $614 United Airlines 05:00
Night 00:00-05:59 $614 United Airlines at 05:00
Morning 06:00-11:59 $624 Delta Air Lines at 06:00
Afternoon 12:00-17:59 $614 United Airlines at 13:18
Evening 18:00-23:59 $624 United Airlines at 18:39

Ontario to Denver route details

Ontario (ONT)

Ontario International

United States

GMT -8

Latitude: 34.055999755859375

Longitude: -117.60099792480469

Denver (DEN)

Denver International

United States

GMT -7

Latitude: 39.861698150635

Longitude: -104.672996521

Distance: Ontario (ONT), United States to Denver (DEN), United States - 1,315.73 km
Flights shown for 06 Jun 2026. View all flights opens the complete search result.

Ontario to Denver - what to expect when booking

The ONT to DEN cards above show selected flight options. Airline prices and seat availability can move quickly, so the final fare is rechecked in the booking flow.

Approx route distance: 1,315.73 km.

Before you book

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More flights from Ontario (ONT)14 routes
Ontario → Chicago
ONT → MDW
Ontario → Dallas
ONT → DFW
Ontario → Guadalajara
ONT → GDL
Ontario → Houston
ONT → IAH
Ontario → Las Vegas
ONT → LAS
Ontario → Oakland
ONT → OAK
Ontario → Phoenix
ONT → PHX
Ontario → Portland
ONT → PDX
Ontario → Sacramento
ONT → SMF
Ontario → Salt Lake City
ONT → SLC
Ontario → San Francisco
ONT → SFO
Ontario → San Jose
ONT → SJC
Ontario → San Juan
ONT → SJU
Ontario → Seattle
ONT → SEA
More flights from Denver (DEN)24 routes
Denver → Akron/canton
DEN → CAK
Denver → Albuquerque
DEN → ABQ
Denver → Amarillo
DEN → AMA
Denver → Anchorage
DEN → ANC
Denver → Aspen
DEN → ASE
Denver → Atlanta
DEN → ATL
Denver → Austin
DEN → AUS
Denver → Bakersfield
DEN → BFL
Denver → Fayetteville
DEN → XNA
Denver → Billings
DEN → BIL
Denver → Birmingham
DEN → BHM
Denver → Bismarck
DEN → BIS
Denver → Bloomington-Normal
DEN → BMI
Denver → Boise
DEN → BOI
Denver → Boston
DEN → BOS
Denver → Bozeman
DEN → BZN
Denver → Burbank
DEN → BUR
Denver → Calgary
DEN → YYC
Denver → Cancun
DEN → CUN
Denver → Casper
DEN → CPR
Denver → Cedar Rapids
DEN → CID
Denver → Charlotte
DEN → CLT
Denver → Cheyenne
DEN → CYS
Denver → Chicago
DEN → ORD
Frequently asked questions - Ontario to Denver flights
Generally yes. When your travel date is fixed, comparing live fares early gives you better visibility of timings, baggage and fare rules before prices change.
The approximate route distance between Ontario (ONT) and Denver (DEN) is 1,315.73 km. Actual flying distance can vary by airline routing.
Availability changes by airline schedule and date. Use the Stops filter to quickly check non-stop, one-stop and connecting options on this landing page.
Airline inventory can change within minutes. Book Now sends the selected result to the review flow where the fare is checked again before final booking.
Yes. The date strip and search box open the full search for the selected date, while this page keeps the route details easy to compare.