Route on-time record
RDU to DEN: most on-time flights and the best time to fly
Raleigh/Durham (Raleigh-Durham International Airport) to Denver (Denver International Airport). 1,795 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was United 2383 at 8:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
RDU → DEN
Raleigh/Durham to Denver: 1,795 nonstop flights a year
On time (12 months)
79%
Cancelled
0.9%
avg delay 16 min
Best time to leave
9 AM to noon
93% on time vs 57% 6 to 9 PM
Most reliable airline
United
85% 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 · United 2383
8:00 AM → 10:03 AM4h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 91% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).
Limited track record · 32 flights
Find United 2383 fares Opens this date on Aviasales#2 · Southwest 1543
5:15 AM → 7:05 AM3h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 91% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 1543 fares Opens this date on Aviasales#3 · United 2288
4:12 PM → 6:20 PM4h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.3%
- Avg arrival delay
- 21 min
- Arrived on time 76% of the time (327 flights, Jun 2025 to May 2026).
- Departs inside RDU's trouble window: 57% of its 14 ground stops and delay programs started between 11 AM and 5 PM.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 327 flights
Find United 2288 fares Opens this date on Aviasales#4 · Frontier 2225
6:43 PM → 8:55 PM4h 06m nonstop
Local times, typical schedule. Last flown 2026-05-31.
67%
chance on time
- On time (history)
- 70%
- Cancelled
- 1.2%
- Avg arrival delay
- 23 min
- Arrived on time 70% of the time (243 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 57% on time; 9 AM to noon: 93%).
- Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).
Strong track record · 243 flights
Find Frontier 2225 fares Opens this date on Aviasales#5 · Southwest 271
6:15 PM → 8:10 PM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
59%
chance on time
- On time (history)
- 65%
- Cancelled
- 0.0%
- Avg arrival delay
- 21 min
- Arrived on time 65% 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: 57% on time; 9 AM to noon: 93%).
- Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 271 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines85%
806 flights · 86% on time as flown · 0.8% cancel
- Southwest Airlines73%
709 flights · 74% on time as flown · 1.0% cancel
- Frontier Airlines72%
280 flights · 72% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM93%
727 flights · avg delay 5 min
- 9 AM to noon93%
85 flights · avg delay 11 min
- 3 to 6 PM69%
695 flights · avg delay 23 min
- 6 to 9 PM57%
230 flights · avg delay 30 min
Best day: Wednesday (84%). Worst: Friday (77%).
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 aircraft42%
- Air traffic control and airport volume33%
- Airline (crew, maintenance, boarding)18%
- 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
RDU to DEN questions
- What time of day is best to fly RDU to DEN?
- 9 AM to noon: 93% of flights arrived on time, against 57% for departures 6 to 9 PM.
- Which airline is most on time from RDU to DEN?
- United, with a season-adjusted 85% chance of operating and arriving on time over 806 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 RDU to DEN?
- July (72% on time); the best was October (89%), 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 RDU
- DEN to RDU (return)
- RDU to ATL 87%
- RDU to ORD 74%
- RDU to CLT 82%
- RDU to BOS 78%
- RDU to LGA 69%
- RDU to MCO 78%
- RDU to PHL 73%
- RDU to JFK 75%
- RDU to MIA 76%
- RDU to DFW 77%
- RDU to BNA 80%
- RDU to EWR 74%
Most on-time flights from RDU on every route →
Live status: FAA delays and ground stops