Denver to Ontario flights (DEN–ONT)
DENDenver International Airport
United States
United States
ONTOntario International Airport
United States
United States
Frontier Airlines, Southwest Airlines and United Airlines fly Denver to Ontario (DEN–ONT) nonstop and back, a great-circle distance of 1,320 km (817 mi).
- From
- DEN
- Denver
- To
- ONT
- Ontario
- Nonstop
- Yes · 3 airlines
- Airlines
- F9 · WN · UA
- Distance
- 1,320 km (817 mi)
- Time difference
- Ontario 1 hour behind
- Most flights
- Southwest Airlines
- Time in the air
- 1h 53m · 1h 45m back
- On time (Touchdown Index)
- 81.2%
- Flights a week
- F9 ~14 · WN ~24 · UA ~14
- Aircraft seen
- Boeing 737-800 · Boeing 737 Max 8 · Boeing 737-700
Network data imported from airport and airline sources:· How we verify
When to fly DEN–ONT
Days in Ontario average 18–28 °C in January, February, March, April, May, November and December. Set your watch 1 hour back on landing at ONT.
Denver to Ontario: frequently asked questions
Tracked flights between 6 September and 3 October 2026, from public ADS-B data.
How long is the DEN–ONT flight?
1h 53m wheels-up to wheels-down, the median of 209 tracked flights; ONT–DEN took 1h 45m.
Which airlines fly DEN–ONT direct?
Frontier Airlines, Southwest Airlines and United Airlines.
What is the time difference between Denver and Ontario?
Ontario is 1 hour behind Denver: a DEN departure at noon is 11:00 local time in ONT.
Is DEN–ONT usually on time?
81.2% of 357 DEN–ONT flights landed within 15 minutes of their usual time; 7% were over an hour late.
How many DEN–ONT flights a week?
Frontier Airlines 14, Southwest Airlines 24 and United Airlines 14 each way.
What aircraft fly DEN–ONT?
Boeing 737-800, Boeing 737 Max 8 and Boeing 737-700.
Ontario to Denver: the return flight (ONT–DEN)
All 3 airlines also fly ONT–DEN nonstop.
The return takes 1h 45m in the air (median of 205 tracked flights).
Airlines flying DEN–ONT nonstop
| Airline | Usually takes off (DEN time) | Type | Alliance | Notes |
|---|---|---|---|---|
 Frontier Airlines F9 | 08:54–23:11 | low-cost | — | — |
 Southwest Airlines WN | 09:17–21:45 | low-cost | — | — |
| United Airlines UA | 11:44–21:00 | full-service | Star Alliance | — |
One-stop alternatives to flying DEN–ONT nonstop
One airline on both legs; check it's sold as one ticket.
- Via Las Vegas (LAS) with Frontier Airlines and Southwest Airlines: 1,330 km (824 mi) flown, 1% further than nonstop.
- Via Phoenix (PHX) with
American Airlines and Southwest Airlines: 1,490 km (926 mi) flown, 13% further than nonstop. - Via Salt Lake City (SLC) with
Delta Air Lines: 1,530 km (948 mi) flown, 16% further than nonstop.
DEN–ONT route map
More from Denver and Ontario
Other arrivals in United States
Also nonstop from DEN, nearest to ONT first (straight-line distance):
- DEN–SNA: Santa Ana · 49 km (30 mi) from ONT
- Long Beach (LGB) · 57 km (36 mi) from ONT
- Burbank (BUR) airport guide · 72 km (44 mi) from ONT
- DEN–LAX: Los Angeles · 75 km (47 mi) from ONT
- Palm Springs (PSP) airport guide · 104 km (65 mi) from ONT
Explore the airlines’ route maps
Departure
Denver International Airport
Denver (DEN), Denver. In our data, 23 airlines fly nonstop from DEN to 165 destinations.
View DEN airport guide →Arrival
Ontario International Airport
Ontario (ONT), Ontario.
Weather in Ontario vs Denver
Ontario is warmer than Denver in 11 months and cooler in 0; the biggest gap is in December (19°C against 9°C). In October it averages 28°C in Ontario and 20°C in Denver.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ontario | 20° | 20° | 22° | 24° | 27° | 30° | 34° | 35° | 33° | 28° | 24° | 19° |
| Denver | 9° | 9° | 14° | 18° | 23° | 30° | 33° | 32° | 28° | 20° | 13° | 9° |
Average daily highs. Climate normals from Ontario, California and Denver (Wikipedia, CC BY-SA), which cite the national weather services.
Onward from Ontario
Places you can't fly to nonstop from DEN, but can from ONT — for a stopover or a second leg.
Related routes
Sources
- en.wikipedia.org — airlines and destinations, checked 2026-10-01
- en.wikipedia.org — airlines and destinations, checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
Flight tracking: adsb.lol community ADS-B data (CC0), 6 September – 3 October 2026. Times are median wheels-up to wheels-down; add taxiing for gate-to-gate.
Report a change — seen something different at the airport or on the airline's site? We re-check and log corrections publicly.