Ontario to Denver (ONT–DEN) — Airlines, Schedules & Connections
No flights match your filters.
No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.
Most recently operated nonstop flights — the month shown is when each was last scheduled. Most destinations remain reachable with a connection.
No discontinued nonstop flights on record for this route.
ONT–DEN is served by 5 airlines with nonstop service. Southwest Airlines, Frontier and United Airlines lead the route. The flight covers 818 miles in approximately 2h 15m. Beyond nonstop, 1-stop connecting options are also available.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| WN Southwest Airlines | 52 | 73H, 7M8, 7S7, B38M | 2h07-2h15 | – | – | |
| F9 Frontier Also: Y4 | 14 | A20N | 2h21-2h24 | – | Y4 | |
| UA United Airlines Also: AC | 14 | 738, 7M9 | 2h10-2h20 | Star Alliance | AC | |
| AA American Airlines | 0 | – | – | Oneworld | – | |
| G6 Global Crossing Airlines Inc. | 0 | – | – | – | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Other ways to reach Denver from Ontario
| Metric | ONT→DEN | SBD→DEN | SNA→DEN |
|---|---|---|---|
| Distance from ONT | – | 21 mi | 30 mi |
| Nonstop airlines | 5 | 1 | 8 |
| Weekly flights | 108 | 2 | 171 |
| Flight time | 2h 15m | 1h 54m | 2h 8m |
| Departure OTP | 84% | – | – |
Travel Essentials
ONT: PDT · DEN: MDT
When it's 6:00 PM in Ontario, it's 7:00 PM in Denver.
RTD A Line runs to Denver Union Station (37 min, $10.50) with connections to light rail and bus routes. Taxis have meters; expect $55–65 to downtown.DEN's tent-roof Jeppesen Terminal is a single building; all three concourses connect via the underground automated train. Rental cars are on level 5. For ski resorts, shuttle services depart from Ground Transportation.
Semi-arid with 300+ days of sunshine. Summers are dry and warm (27–34°C) with afternoon thunderstorms that produce dramatic but brief delays. Winters bring cold temperatures (−8 to 5°C) and heavy blizzards that can shut down ground operations.
Spring snowstorms can be heavier than midwinter ones. Altitude (5,430 ft) means low humidity year-round; stay hydrated.
ONT–DEN Quick Facts
Frequently Asked Questions
Flights from ONT to DEN
Ontario International Airport (ONT) and Denver International Airport (DEN) are connected by nonstop service from Southwest Airlines, Frontier, United Airlines, American Airlines and Global Crossing Airlines Inc.. With 108 weekly departures, this is a heavily served route.
ONT to DEN Flight Duration and Schedule
Nonstop flight time from ONT to DEN is about 2 hours 15 minutes gate to gate. The route covers a distance of 818 miles (1,316 km). There are approximately 108 weekly flights outbound and 105 return, totaling 213 flights per week in both directions.
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Harry Reid, Phoenix Sky Harbor and Salt Lake City. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Long Beach (LGB).