Route on-time record
ASE to SFO: most on-time flights and the best time to fly
Aspen (Aspen-Pitkin County Airport (Sardy Field)) to San Francisco (San Francisco International Airport). 376 nonstop flights in Jun 2025 to May 2026, 69% arrived within 15 minutes and 6.1% were cancelled. The most reliable flight number was SkyWest 5258 at 4:01 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ASE → SFO
Aspen to San Francisco: 376 nonstop flights a year
On time (12 months)
69%
Cancelled
6.1%
avg delay 34 min
Best time to leave
Before 9 AM
74% on time vs 60% 6 to 9 PM
Most reliable airline
SkyWest
65% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · SkyWest 5258 · sold as United Express, Delta Connection, American Eagle or Alaska
4:01 PM → 5:50 PM2h 49m nonstop
Local times, typical schedule. Last flown 2026-04-10.
66%
chance on time
- On time (history)
- 72%
- Cancelled
- 10.2%
- Avg arrival delay
- 23 min
- Arrived on time 72% of the time (43 flights, Jun 2025 to May 2026).
- Cancelled 10.2% of the time (5 of 49).
- Departs outside ASE's trouble window (6 AM to noon, when 85% of its 46 ground stops and delay programs started).
- Short track record (43 flights), so its score leans on the airline's record at this hour.
Limited track record · 43 flights
Find 4:01 PM flight fares Opens this date on Aviasales#2 · SkyWest 5745 · sold as United Express, Delta Connection, American Eagle or Alaska
1:40 PM → 3:29 PM2h 49m nonstop
Local times, typical schedule. Last flown 2026-05-31.
59%
chance on time
- On time (history)
- 60%
- Cancelled
- 7.2%
- Avg arrival delay
- 54 min
- Arrived on time 60% of the time (77 flights, Jun 2025 to May 2026).
- Cancelled 7.2% of the time (6 of 83).
- Departs outside ASE's trouble window (6 AM to noon, when 85% of its 46 ground stops and delay programs started).
Moderate track record · 77 flights
Find 1:40 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)65%
376 flights · 69% on time as flown · 6.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM74%
115 flights · avg delay 28 min
- 9 AM to noon73%
66 flights · avg delay 29 min
- Noon to 3 PM66%
70 flights · avg delay 45 min
- 3 to 6 PM72%
49 flights · avg delay 23 min
- 6 to 9 PM60%
76 flights · avg delay 45 min
Best day: Wednesday (77%). Worst: Friday (58%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume38%
- Late-arriving aircraft30%
- Airline (crew, maintenance, boarding)26%
- Severe weather6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
ASE to SFO questions
- What time of day is best to fly ASE to SFO?
- Before 9 AM: 74% of flights arrived on time, against 60% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from ASE to SFO?
- SkyWest, with a season-adjusted 65% chance of operating and arriving on time over 376 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on ASE to SFO?
- February (56% on time); the best was September (84%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from ASE
- SFO to ASE (return)
- ASE to DEN 74%
- ASE to LAX 72%
- ASE to DFW 64%
- ASE to ORD 61%
- ASE to IAH 72%
- ASE to ATL 74%
Live status: FAA delays and ground stops