Route on-time record
DEN to PHL: most on-time flights and the best time to fly
Denver (Denver International Airport) to Philadelphia (Philadelphia International Airport). 2,993 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was American 516 at 8:40 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
DEN → PHL
Denver to Philadelphia: 2,993 nonstop flights a year
On time (12 months)
72%
Cancelled
1.2%
avg delay 21 min
Best time to leave
Before 9 AM
85% on time vs 41% 6 to 9 PM
Most reliable airline
United
79% 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 · American 516
8:40 AM → 2:20 PM3h 40m nonstop
Local times, typical schedule. Last flown 2026-05-20.
87%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.9%
- Avg arrival delay
- 9 min
- Arrived on time 91% of the time (107 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 6 to 9 PM: 41%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 107 flights
Find American 516 fares Opens this date on Aviasales#2 · United 1575
10:05 AM → 3:47 PM3h 42m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.5%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (208 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 208 flights
Find United 1575 fares Opens this date on Aviasales#3 · American 2672
7:05 AM → 12:37 PM3h 32m nonstop
Local times, typical schedule. Last flown 2026-04-06.
83%
chance on time
- On time (history)
- 87%
- Cancelled
- 3.2%
- Avg arrival delay
- 18 min
- Arrived on time 87% of the time (149 flights, Jun 2025 to May 2026).
- Cancelled 3.2% of the time (5 of 154).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 6 to 9 PM: 41%).
- 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 · 149 flights
Find American 2672 fares Opens this date on Aviasales#4 · American 2023
12:40 PM → 6:25 PM3h 45m nonstop
Local times, typical schedule. Last flown 2026-05-20.
80%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 86% of the time (43 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 43 flights
Find American 2023 fares Opens this date on Aviasales#5 · United 1214
11:59 PM → 5:31 AM3h 32m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 89% of the time (9 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find United 1214 fares Opens this date on Aviasales#6 · United 2234
1:55 PM → 7:37 PM3h 42m nonstop
Local times, typical schedule. Last flown 2026-05-20.
79%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 21 flights
Find United 2234 fares Opens this date on Aviasales#7 · American 1759
2:04 PM → 7:50 PM3h 46m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.
- 92% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 8 flights
Find American 1759 fares Opens this date on Aviasales#8 · American 2344
8:47 AM → 2:28 PM3h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 72%
- Cancelled
- 5.0%
- Avg arrival delay
- 21 min
- Arrived on time 72% of the time (96 flights, Jun 2025 to May 2026).
- Cancelled 5.0% of the time (5 of 101).
- Leaves in this route's most on-time window (Before 9 AM: 85% on time; 6 to 9 PM: 41%).
- 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 · 96 flights
Find American 2344 fares Opens this date on Aviasales#9 · American 2500
11:59 PM → 5:35 AM3h 36m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 78% of the time (9 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find American 2500 fares Opens this date on Aviasales#10 · American 3312
12:15 PM → 5:59 PM3h 44m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 23 min
- Arrived on time 63% of the time (8 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.
- 85% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 8 flights
Find American 3312 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines79%
960 flights · 80% on time as flown · 0.6% cancel
- American Airlines77%
853 flights · 78% on time as flown · 1.9% cancel
- Southwest Airlines63%
878 flights · 63% on time as flown · 1.0% cancel
- Frontier Airlines61%
302 flights · 58% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM85%
353 flights · avg delay 16 min
- 9 AM to noon80%
825 flights · avg delay 11 min
- Noon to 3 PM73%
675 flights · avg delay 23 min
- 3 to 6 PM65%
562 flights · avg delay 29 min
- 6 to 9 PM41%
221 flights · avg delay 43 min
- After 9 PM71%
357 flights · avg delay 20 min
Best day: Tuesday (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 aircraft45%
- Airline (crew, maintenance, boarding)37%
- Air traffic control and airport volume16%
- Severe weather1%
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 PHL questions
- What time of day is best to fly DEN to PHL?
- Before 9 AM: 85% of flights arrived on time, against 41% 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 DEN to PHL?
- United, with a season-adjusted 79% chance of operating and arriving on time over 960 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 PHL?
- June (63% on time); the best was November (81%), 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
- PHL 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