Airport reliability
Aspen (ASE) on-time performance
How reliably flights leave Aspen, CO (ASE) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Aspen, CO8,137 departures in 12 months
- Departures on time
- 67.0% U.S. average 75.6%
- Cancelled
- 5.8% U.S. average 1.9%
- 60+ minutes late
- 14.4% U.S. average 8.1%
- Scheduled departures
- 8,137 12 months
What this means
ASE departures ran below the U.S. average.
- 67.0% of the 8,137 scheduled departures from Aspen (ASE) arrived at their destination on time, 8.6 points lower than the U.S. average of 75.6%.
- 5.8% of departures were cancelled (U.S. average 1.9%), and 14.4% arrived an hour or more late.
- Flights arriving at ASE were on time 65.9% of the time.
- Over the last 3 years, May was the most reliable month for departures from ASE (76.2% on time) and February the least reliable (57.6%).
- Cancellations peaked in March, when 10.1% of flights were cancelled.
- Flights scheduled to depart 8 am to 9 am were the most punctual (84.8% on time); flights scheduled to depart 4 pm to 5 pm were the least (53.1%).
Airlines at ASE
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | 67.0% | 5.8% | 14.4% | 105 min | 8,137 |
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time ASE average 67.0%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing 7 am to 8 am | 81.9% | 1,193 |
| Departing 8 am to 9 am | 84.8% | 329 |
| Departing 9 am to 10 am | 63.8% | 531 |
| Departing 10 am to 11 am | 70.7% | 566 |
| Departing 11 am to noon | 66.6% | 721 |
| Departing noon to 1 pm | 65.3% | 1,263 |
| Departing 1 pm to 2 pm | 64.4% | 1,125 |
| Departing 2 pm to 3 pm | 60.9% | 542 |
| Departing 3 pm to 4 pm | 58.5% | 600 |
| Departing 4 pm to 5 pm | 53.1% | 384 |
| Departing 5 pm to 6 pm | 64.6% | 308 |
| Departing 6 pm to 7 pm | 62.0% | 308 |
| Departing 7 pm to 8 pm | 58.1% | 267 |
Best and worst months at ASE
Share of scheduled flights on time 12-month average 67.0%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 62.4% | 3,033 |
| February | 57.6% | 2,848 |
| March | 59.6% | 3,310 |
| April | 68.3% | 1,472 |
| May | 76.2% | 441 |
| June | 59.6% | 1,918 |
| July | 63.5% | 2,179 |
| August | 66.4% | 2,031 |
| September | 76.0% | 1,561 |
| October | 76.0% | 1,273 |
| November | 76.0% | 1,007 |
| December | 61.3% | 2,208 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 78.4% | 550 |
| Oct 2025 | 71.6% | 447 |
| Nov 2025 | 84.1% | 328 |
| Dec 2025 | 59.8% | 803 |
| Jan 2026 | 65.6% | 1,037 |
| Feb 2026 | 58.2% | 1,012 |
| Mar 2026 | 67.1% | 1,188 |
| Apr 2026 | 76.1% | 481 |
| May 2026 | 86.8% | 182 |
| Jun 2026 | 61.5% | 626 |
| Jul 2026 | 63.1% | 759 |
| Aug 2026 | 68.2% | 724 |
Busiest routes from ASE
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Denver (DEN) | 72.8% | 5.0% | 1 | 2,742 |
| Los Angeles (LAX) | 68.6% | 6.7% | 1 | 1,228 |
| Dallas/Fort Worth (DFW) | 63.0% | 7.0% | 1 | 1,185 |
| Chicago (ORD) | 58.6% | 5.9% | 1 | 1,179 |
| Houston (IAH) | 72.0% | 4.5% | 1 | 639 |
| Atlanta (ATL) | 73.1% | 3.6% | 1 | 450 |
| San Francisco (SFO) | 53.4% | 5.6% | 1 | 373 |
| Austin (AUS) | 52.5% | 9.8% | 1 | 183 |
| Phoenix (PHX) | 65.5% | 5.5% | 1 | 110 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Aspen, CO (ASE) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.