Denver (DEN) – Ontario, California (ONT)
- Distance
- 1,317 km
- 819 mi · 711 nm
- Flight time
- 2 h 16 min / 2 h 11 min
- Average gate to gate: DEN → ONT / back
- Time difference
- 1 h
- CO2 per passenger
- 165 kg
- One way, economy, incl. RF (98 kg CO2 only)
- Passengers / year
- 731,270
- Aug 2025 – Jul 2026 · −5.4%
- Flights / week
- 102
- Both directions, average
- Seats filled
- 79%
- 922,508 seats a year
- Airlines nonstop
- 3
- WN, UA, F9
Traffic: U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service), Aug 2025 – Jul 2026. Distance: WGS-84 ellipsoid. CO2: UK DESNZ 2026 factors. Sources
The way there
- Heading from DEN
- 245°
- Heading from ONT
- 57°
- Halfway point
- 37.13, -111.38
- Great-circle km
- 1,316 km (sphere, for EU261)
- In the air DEN → ONT
- 1 h 53 min
- In the air ONT → DEN
- 1 h 47 min
- Clocks
- Ontario, California is 1 h behind Denver
The estimate for a route without real times is 2 h 20 min; how it is worked out is on Sources.
Show as a table
| Month | Passengers |
|---|---|
| Aug 2025 | 69,249 |
| Sep 2025 | 62,769 |
| Oct 2025 | 67,622 |
| Nov 2025 | 61,081 |
| Dec 2025 | 53,937 |
| Jan 2026 | 49,573 |
| Feb 2026 | 46,143 |
| Mar 2026 | 54,754 |
| Apr 2026 | 57,963 |
| May 2026 | 66,077 |
| Jun 2026 | 72,374 |
| Jul 2026 | 69,728 |
Show as a table
| Month | Flights |
|---|---|
| Aug 2025 | 506 |
| Sep 2025 | 474 |
| Oct 2025 | 481 |
| Nov 2025 | 442 |
| Dec 2025 | 391 |
| Jan 2026 | 370 |
| Feb 2026 | 341 |
| Mar 2026 | 396 |
| Apr 2026 | 409 |
| May 2026 | 485 |
| Jun 2026 | 499 |
| Jul 2026 | 486 |
Airlines flying DEN–ONT nonstop
| Airline | Flights / week | Share of passengers |
|---|---|---|
| WNSouthwest Airlines | 49 | 46% |
| UAUnited Air Lines | 32 | 30% |
| F9Frontier Airlines | 21 | 24% |
Both directions, Aug 2025 – Jul 2026. Airlines with at least one flight a month. U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service). Sources
Aircraft on this route
- Boeing 737-800 · 1,607 flights
- Boeing B737 Max 800 · 1,326 flights
- Airbus Industrie A320-200n · 531 flights
- Boeing 737-700/700LR/Max 7 · 495 flights
- Airbus Industrie A321-200n · 391 flights
- Airbus Industrie A320-100/200 · 321 flights
- Boeing B737 Max 900 · 306 flights
- Boeing 737-900ER · 128 flights
Also carried: 143 tonnes of freight and 1 tonnes of mail a year (passenger and cargo flights).
Punctuality
- On time
- 78%
- Arrived within 15 min of schedule
- Average delay
- 15 min
- Late arrivals count, early ones as 0
- Cancelled
- 0.2%
- Flights counted
- 5,285
- Aug 2025 – Jul 2026
| Airline | On time | Average delay |
|---|---|---|
| WNSouthwest Airlines | 72.8% | 15 min |
| UAUnited Air Lines | 83.2% | 14 min |
| F9Frontier Airlines | 82.1% | 15 min |
Delay minutes by cause: airline 30% · aircraft arriving late 48% · air traffic system 20% · weather 1% · security 0%.
Both directions, Aug 2025 – Jul 2026. BTS Reporting Carrier On-Time Performance (US domestic flights of the larger US airlines). Sources
What passengers paid
- Average fare, Q1 2026
- $194
- One way, all cabins
- Average over a year
- $171
- Q2 2025 – Q1 2026
- Largest airline
- Southwest Airlines
- 48% of passengers · $202
- Lowest-fare airline
- Frontier Airlines
- 27% of passengers · $137
History, not a price to book: what the average passenger paid per one-way trip in each quarter (Q2 2025 $167 · Q3 2025 $156 · Q4 2025 $174 · Q1 2026 $194).
Fare outlook, Q1 2027: about $198, likely $171–$226
The average fare paid we expect a year after Q1 2026, the newest DOT quarter. On this route, past forecasts made this way fell inside the range 81% of the time over 21 quarters (median error 7.7%). An estimate from US DOT data: not a price you can book, not a guarantee, not advice on when to buy. How the outlook works
Cheapest quarter on this route: Q3, typically 3% below the year's average (9 years of DOT data, without 2020–21).
U.S. DOT Consumer Airfare Report, Table 1a (airline ticket sample, US domestic airport pairs). Sources
Delay compensation (EU261 / UK261)
Measured by great-circle distance: 1,316 km.
Neither EU261 nor UK261 covers this route: it neither starts nor ends in the EU, EEA, Switzerland or the UK. Other countries have their own rules (for example Canada's APPR or Brazil's ANAC rules).
Also owed for a cancellation with less than 14 days' notice or denied boarding. Not owed for extraordinary circumstances. On a connection, the distance to the final destination counts. From 23 October 2027 the EU's Regulation 2026/2202 applies; it keeps these amounts (what changes in 2027). Information, not legal advice.
Every airport pair between Denver and Ontario, California
Kilometres. Linked numbers have a page of their own. All Denver airports