Route on-time record
DEN to PIT: most on-time flights and the best time to fly
Denver (Denver International Airport) to Pittsburgh (Pittsburgh International Airport). 1,726 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 1308 at 9:55 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
DEN → PIT
Denver to Pittsburgh: 1,726 nonstop flights a year
On time (12 months)
72%
Cancelled
0.6%
avg delay 18 min
Best time to leave
9 AM to noon
81% on time vs 55% 6 to 9 PM
Most reliable airline
United
78% chance on time
Lowest nonstop fare seen in the next two months: $357 (United 2155 on 2026-10-23). 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 1308
9:55 AM → 3:02 PM3h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.5%
- Avg arrival delay
- 8 min
- Arrived on time 85% of the time (217 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 81% on time; 6 to 9 PM: 55%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Strong track record · 217 flights
Find United 1308 fares Opens this date on Aviasales#2 · United 1246
5:25 PM → 10:24 PM2h 59m nonstop
Local times, typical schedule. Last flown 2026-03-28.
76%
chance on time
- On time (history)
- 81%
- Cancelled
- 3.3%
- Avg arrival delay
- 12 min
- Arrived on time 81% of the time (59 flights, Jun 2025 to May 2026).
- Cancelled 3.3% of the time (2 of 61).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (59 flights), so its score leans on the airline's record at this hour.
Limited track record · 59 flights
Find United 1246 fares Opens this date on Aviasales#3 · United 673
5:37 PM → 10:50 PM3h 13m nonstop
Local times, typical schedule. Last flown 2026-04-29.
76%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 81% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find United 673 fares Opens this date on Aviasales#4 · United 2155
6:35 PM → 11:49 PM3h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 81% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 55% on time; 9 AM to noon: 81%).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 32 flights
Find United 2155 fares Opens this date on Aviasales#5 · Southwest 4215
10:25 AM → 3:25 PM3h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1725; its record covers all of them.
74%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 76% of the time (79 flights, Jun 2025 to May 2026).
- Never cancelled in 79 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 81% on time; 6 to 9 PM: 55%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 79 flights
Find Southwest 4215 fares Opens this date on Aviasales#6 · Southwest 2718
7:15 PM → 12:10 AM2h 55m nonstop
Local times, typical schedule. Last flown 2026-04-06.
54%
chance on time
- On time (history)
- 55%
- Cancelled
- 0.0%
- Avg arrival delay
- 28 min
- Arrived on time 55% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 55% on time; 9 AM to noon: 81%).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 33 flights
Find Southwest 2718 fares Opens this date on Aviasales#7 · Southwest 3239
7:05 PM → 12:05 AM3h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
54%
chance on time
- On time (history)
- 57%
- Cancelled
- 0.0%
- Avg arrival delay
- 29 min
- Arrived on time 57% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 55% on time; 9 AM to noon: 81%).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 54 flights
Find Southwest 3239 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines78%
905 flights · 78% on time as flown · 0.6% cancel
- Frontier Airlines77%
58 flights · 83% on time as flown · 0.4% cancel
- Southwest Airlines64%
763 flights · 63% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon81%
715 flights · avg delay 11 min
- Noon to 3 PM74%
261 flights · avg delay 21 min
- 3 to 6 PM65%
483 flights · avg delay 20 min
- 6 to 9 PM55%
224 flights · avg delay 35 min
Best day: Sunday (76%). Worst: Thursday (71%).
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
- Late-arriving aircraft54%
- Airline (crew, maintenance, boarding)30%
- Air traffic control and airport volume14%
- Severe weather2%
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
DEN to PIT questions
- What time of day is best to fly DEN to PIT?
- 9 AM to noon: 81% of flights arrived on time, against 55% for departures 6 to 9 PM.
- Which airline is most on time from DEN to PIT?
- United, with a season-adjusted 78% 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 DEN to PIT?
- June (58% on time); the best was November (83%), 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 DEN
- PIT to DEN (return)
- DEN to PHX 75%
- DEN to SLC 77%
- DEN to LAX 79%
- DEN to LAS 75%
- DEN to SEA 73%
- DEN to ORD 70%
- DEN to DFW 75%
- DEN to SAN 76%
- DEN to MSP 78%
- DEN to ATL 80%
- DEN to SFO 68%
- DEN to AUS 76%
Live status: FAA delays and ground stops