--- title: "Denver (DEN) to Ontario (ONT) flights: who flies it" description: "United Airlines and Frontier Airlines fly nonstop from DEN to ONT, about 34 flights a week, covering 817 miles. See the full timetable and who flies it on 2LNR." canonical: "https://2lnr.com/routes/den-ont" url: "https://2lnr.com/routes/den-ont.md" date_modified: "2026-10-18T05:10:47Z" --- # Denver to Ontario (DEN-ONT): nonstop flights and who flies them United Airlines and Frontier Airlines fly nonstop between Denver (DEN) and Ontario (ONT), roughly 34 times a week. The timetable below shows the nonstop scheduled at 2h 20m to 2h 28m for the 817 miles. Schedule last confirmed October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 22, 2026. See DEN to ONT on the interactive map [Get started free](https://2lnr.com/login) 34 Flights a week, 4-week average 2h 20m to 2h 28m Scheduled flight time 817 mi Nonstop distance Free To get started ## Denver to Ontario flight schedule Scheduled nonstop departures for DEN to ONT starting October 22, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book. Scheduled nonstop departures from Denver (DEN) to Ontario (ONT) | Date | Flight | Airline | Departs DEN | Arrives ONT | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Thu, Oct 22 | F9 2907 | Frontier Airlines | 09:01 | 10:29 | 2h 28m | [Airbus A320neo](https://2lnr.com/seatmaps/f9/a320neo.md) | | Thu, Oct 22 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md) | | Thu, Oct 22 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | [Boeing 737-900](https://2lnr.com/seatmaps/ua/737-900.md) | | Thu, Oct 22 | F9 1261 | Frontier Airlines | 22:29 | 23:50 | 2h 21m | [Airbus A321](https://2lnr.com/seatmaps/f9/a321.md) | | Fri, Oct 23 | F9 2907 | Frontier Airlines | 09:01 | 10:29 | 2h 28m | Airbus A320neo | | Fri, Oct 23 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | Boeing 737 MAX 9 | | Fri, Oct 23 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | Boeing 737-900 | | Fri, Oct 23 | F9 1261 | Frontier Airlines | 22:29 | 23:50 | 2h 21m | Airbus A320neo | | Sat, Oct 24 | F9 2907 | Frontier Airlines | 09:01 | 10:29 | 2h 28m | Airbus A321 | | Sat, Oct 24 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | Boeing 737 MAX 9 | | Sat, Oct 24 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | Boeing 737-900 | | Sat, Oct 24 | F9 1261 | Frontier Airlines | 22:29 | 23:50 | 2h 21m | Airbus A320neo | | Sun, Oct 25 | F9 2907 | Frontier Airlines | 09:01 | 10:29 | 2h 28m | Airbus A320neo | | Sun, Oct 25 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | Boeing 737 MAX 9 | | Sun, Oct 25 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | Boeing 737-900 | | Sun, Oct 25 | F9 1261 | Frontier Airlines | 22:29 | 23:50 | 2h 21m | Airbus A320neo | | Mon, Oct 26 | F9 2907 | Frontier Airlines | 09:01 | 10:29 | 2h 28m | Airbus A320neo | | Mon, Oct 26 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | Boeing 737 MAX 9 | | Mon, Oct 26 | UA 1542 | United Airlines | 19:30 | 20:56 | 2h 26m | Boeing 737 MAX 9 | | Mon, Oct 26 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | Boeing 737-900 | | Mon, Oct 26 | F9 1261 | Frontier Airlines | 22:29 | 23:50 | 2h 21m | Airbus A320neo | | Tue, Oct 27 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | Boeing 737 MAX 9 | | Tue, Oct 27 | F9 2907 | Frontier Airlines | 12:15 | 13:40 | 2h 25m | Airbus A320neo | | Tue, Oct 27 | UA 1542 | United Airlines | 19:30 | 20:56 | 2h 26m | Boeing 737 MAX 9 | | Tue, Oct 27 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | Boeing 737-900 | | Tue, Oct 27 | F9 1261 | Frontier Airlines | 22:34 | 23:55 | 2h 21m | Airbus A320neo | | Wed, Oct 28 | UA 430 | United Airlines | 11:26 | 12:46 | 2h 20m | Boeing 737 MAX 9 | | Wed, Oct 28 | F9 2907 | Frontier Airlines | 12:15 | 13:40 | 2h 25m | Airbus A320neo | | Wed, Oct 28 | UA 1542 | United Airlines | 19:30 | 20:56 | 2h 26m | Boeing 737 MAX 9 | | Wed, Oct 28 | UA 2028 | United Airlines | 19:35 | 20:58 | 2h 23m | Boeing 737-900 | | Wed, Oct 28 | F9 1261 | Frontier Airlines | 22:29 | 23:51 | 2h 22m | Airbus A320neo | Showing all 31 scheduled DEN to ONT departures across 7 days with service, starting October 22, 2026. Later dates are on the interactive map. Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure. See every DEN to ONT date on the interactive map ## Aircraft on the Denver to Ontario nonstop In the schedule table on this page, United Airlines flies the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md) and the [Boeing 737-900](https://2lnr.com/seatmaps/ua/737-900.md), and Frontier Airlines flies the [Airbus A320neo](https://2lnr.com/seatmaps/f9/a320neo.md) and the [Airbus A321](https://2lnr.com/seatmaps/f9/a321.md). Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## The full DEN to ONT nonstop schedule This page carries the full DEN to ONT nonstop schedule, who operates each departure and how often it runs; the reverse direction is linked below. ### See the schedule Who operates each DEN to ONT nonstop and how often it runs, from 2LNR's schedule data. ### Plan on the map See DEN to ONT on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying Denver to Ontario nonstop Carriers operating DEN to ONT nonstop in the current schedule. - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) - [Frontier Airlines (F9) route map](https://2lnr.com/routes/airlines/f9.md)\ [The aircraft F9 flies](https://2lnr.com/seatmaps/f9.md) See DEN to ONT on the interactive map → ## Frequently asked questions about DEN to ONT **How long is the flight from Denver (DEN) to Ontario (ONT)?** Scheduled flight times from Denver (DEN) to Ontario (ONT) run from 2h 20m to 2h 28m across the departures in the schedule table on this page. The nonstop covers about 817 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from DEN to ONT?** United Airlines and Frontier Airlines fly DEN to ONT nonstop. 2LNR doesn't show award or upgrade space for any of them on DEN to ONT, so this page carries the schedule rather than a space claim. **How many flights a week are there from DEN to ONT?** About 34 nonstop flights a week run between Denver (DEN) and Ontario (ONT) in the current schedule, operated by United Airlines and Frontier Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from DEN to ONT depart?** Scheduled DEN to ONT nonstops in the next 7 days with service leave between 09:01 and 22:34, local time at Denver. The schedule table on this page lists every departure by date, with its arrival time and aircraft. **Which flights operate DEN to ONT nonstop?** In the schedule table on this page, DEN to ONT nonstops fly as UA 430, UA 1542, and UA 2028 on United Airlines, and F9 1261 and F9 2907 on Frontier Airlines. The table lists each departure by date with its times and aircraft. **Does 2LNR show upgrade or award space on DEN to ONT?** Not on this route: 2LNR doesn't show award or upgrade space for any airline flying DEN to ONT. The page carries the full DEN to ONT nonstop schedule and who flies each departure, and the reverse direction is linked below. Flying the other way? See [ONT to DEN nonstop flights](https://2lnr.com/routes/ont-den.md). Award seats rather than schedules? See [award availability by airline](https://2lnr.com/awards.md). Looking beyond this route? See [every route from Denver (DEN)](https://2lnr.com/routes/den.md), or [every route from Ontario (ONT)](https://2lnr.com/routes/ont.md). Nonstops from Denver (DEN) to other airports within 150 miles of Ontario (ONT): - [Denver (DEN) to Santa Ana (SNA)](https://2lnr.com/routes/den-sna.md), 30 miles from ONT - [Denver (DEN) to Burbank (BUR)](https://2lnr.com/routes/den-bur.md), 45 miles from ONT - [Denver (DEN) to Los Angeles (LAX)](https://2lnr.com/routes/den-lax.md), 48 miles from ONT - [Denver (DEN) to Palm Springs (PSP)](https://2lnr.com/routes/den-psp.md), 64 miles from ONT - [Denver (DEN) to Carlsbad (CLD)](https://2lnr.com/routes/den-cld.md), 67 miles from ONT Distances are great-circle between the airports, not driving distance. - [How to plan an upgrade by route](https://2lnr.com/guides/upgrade-strategy.md) ## See the full DEN to ONT nonstop schedule Every scheduled departure on this route, with who flies it. 2LNR shows upgrade and award space by date on the carriers it tracks, the next 14 days free on every product and the full horizon on Pro. [Get started free](https://2lnr.com/login)