Route on-time record
PIT to DEN: most on-time flights and the best time to fly
Pittsburgh (Pittsburgh International Airport) to Denver (Denver International Airport). 1,729 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was United 1765 at 8:19 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PIT → DEN
Pittsburgh to Denver: 1,729 nonstop flights a year
On time (12 months)
81%
Cancelled
0.7%
avg delay 13 min
Best time to leave
9 AM to noon
94% on time vs 59% 6 to 9 PM
Most reliable airline
United
86% chance on time
Lowest nonstop fare seen in the next two months: $418 (United 1816 on 2026-10-24). 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 · United 1765
8:19 AM → 10:03 AM3h 44m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.9%
- Avg arrival delay
- 6 min
- Arrived on time 93% of the time (324 flights, Jun 2025 to May 2026).
Strong track record · 324 flights
Find United 1765 fares Opens this date on Aviasales#2 · Southwest 1746
5:20 AM → 7:00 AM3h 40m nonstop
Local times, typical schedule. Last flown 2026-04-06.
89%
chance on time
- On time (history)
- 94%
- Cancelled
- 3.0%
- Avg arrival delay
- 11 min
- Arrived on time 94% of the time (32 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 1746 fares Opens this date on Aviasales#3 · Southwest 1704
6:15 AM → 7:45 AM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-29.
87%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 95% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 1704 fares Opens this date on Aviasales#4 · United 1816
4:18 PM → 6:02 PM3h 44m nonstop
Local times, typical schedule. Last flown 2026-05-20.
84%
chance on time
- On time (history)
- 86%
- Cancelled
- 1.3%
- Avg arrival delay
- 9 min
- Arrived on time 86% of the time (76 flights, Jun 2025 to May 2026).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 76 flights
Find United 1816 fares Opens this date on Aviasales#5 · United 531
4:25 PM → 5:55 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 44%
- Cancelled
- 0.0%
- Avg arrival delay
- 47 min
- Arrived on time 44% of the time (9 flights, Jun 2025 to May 2026).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- 62% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find United 531 fares Opens this date on Aviasales#6 · Southwest 2208
6:35 PM → 8:05 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
63%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 25 min
- Arrived on time 67% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 59% on time; 9 AM to noon: 94%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 2208 fares Opens this date on Aviasales#7 · Southwest 1661
5:55 PM → 7:30 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-04-01.
62%
chance on time
- On time (history)
- 50%
- Cancelled
- 0.0%
- Avg arrival delay
- 31 min
- Arrived on time 50% of the time (8 flights, Jun 2025 to May 2026).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 1661 fares Opens this date on Aviasales#8 · Southwest 4285
6:25 PM → 8:00 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-04-06.
57%
chance on time
- On time (history)
- 56%
- Cancelled
- 10.0%
- Avg arrival delay
- 18 min
- Arrived on time 56% of the time (18 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 59% on time; 9 AM to noon: 94%).
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find Southwest 4285 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines86%
905 flights · 87% on time as flown · 0.7% cancel
- Frontier Airlines77%
58 flights · 72% on time as flown · 0.5% cancel
- Southwest Airlines75%
766 flights · 75% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
630 flights · avg delay 6 min
- 9 AM to noon94%
249 flights · avg delay 4 min
- Noon to 3 PM68%
75 flights · avg delay 19 min
- 3 to 6 PM75%
506 flights · avg delay 17 min
- 6 to 9 PM59%
269 flights · avg delay 27 min
Best day: Wednesday (85%). Worst: Friday (78%).
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 aircraft34%
- Airline (crew, maintenance, boarding)24%
- Severe weather4%
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
PIT to DEN questions
- What time of day is best to fly PIT to DEN?
- 9 AM to noon: 94% of flights arrived on time, against 59% for departures 6 to 9 PM.
- Which airline is most on time from PIT to DEN?
- United, with a season-adjusted 86% chance of operating and arriving on time over 905 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 PIT to DEN?
- June (74% on time); the best was November (90%), 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 PIT
- DEN to PIT (return)
- PIT to ORD 78%
- PIT to LGA 80%
- PIT to ATL 90%
- PIT to MCO 79%
- PIT to BOS 79%
- PIT to CLT 84%
- PIT to EWR 87%
- PIT to JFK 87%
- PIT to DFW 79%
- PIT to DCA 69%
- PIT to IAD 88%
- PIT to PHL 75%
Live status: FAA delays and ground stops