Ontario to Denver (ONT–DEN) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
ONT–DEN is served by 3 airlines with nonstop service. Southwest Airlines, United Airlines and Frontier lead the route. The flight covers 818 miles in approximately 1h 59m. Beyond nonstop, 55 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| WN Southwest Airlines | 25 | 737, 738, B38M | 1h59-2h10 | – | – | |
| UA United Airlines Also: AC | 20 | 320, 738 | 2h21-2h22 | Star Alliance | AC | |
| F9 Frontier Also: Y4 | 14 | 321, 32N | 2h06-2h16 | – | Y4 |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach Denver from Ontario
| Metric | ONT→DEN | SBD→DEN | SNA→DEN |
|---|---|---|---|
| Distance from ONT | – | 21 mi | 30 mi |
| Nonstop airlines | 3 | 1 | 6 |
| Weekly flights | 86 | 2 | 125 |
| Flight time | 1h 59m | 1h 40m | 2h 15m |
| Departure OTP | 100% | – | – |
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 Frontier, United Airlines and Southwest Airlines. With 86 weekly departures, this is a heavily served route.
ONT to DEN Flight Duration and Schedule
Nonstop flight time from ONT to DEN ranges from 1 hours 59 minutes to 2 hours 23 minutes. The route covers a distance of 818 miles (1,316 km). There are approximately 86 weekly flights outbound and 90 return, totaling 176 flights per week in both directions.
Connecting Options and Alternatives
55 one-stop connections are available, with the fastest taking approximately 3 hours via SCF. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Long Beach (LGB).