Route on-time record
IAD to RDU: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Raleigh/Durham (Raleigh-Durham International Airport). 1,334 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was United 1536 at 8:16 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → RDU
Dulles to Raleigh/Durham: 1,334 nonstop flights a year
On time (12 months)
83%
Cancelled
1.3%
avg delay 13 min
Best time to leave
Before 9 AM
91% on time vs 77% 3 to 6 PM
Most reliable airline
United
84% chance on time
Lowest nonstop fare seen in the next two months: $240 (United 2382 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 1536
8:16 AM → 9:32 AM1h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 97% of the time (63 flights, Jun 2025 to May 2026).
- Never cancelled in 63 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 77%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Moderate track record · 63 flights
Find United 1536 fares Opens this date on Aviasales#2 · United 635
8:25 AM → 9:34 AM1h 09m nonstop
Local times, typical schedule. Last flown 2026-03-28.
90%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 92% of the time (24 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 77%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 635 fares Opens this date on Aviasales#3 · United 1357
12:53 PM → 2:06 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-20.
84%
chance on time
- On time (history)
- 86%
- Cancelled
- 1.7%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (228 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Lands inside RDU's trouble window: 57% of its 14 ground stops and delay programs started between 11 AM and 5 PM.
Strong track record · 228 flights
Find United 1357 fares Opens this date on Aviasales#4 · United 1322
5:32 PM → 6:50 PM1h 17m nonstop
Local times, typical schedule. Last flown 2026-05-20.
78%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.8%
- Avg arrival delay
- 23 min
- Arrived on time 79% of the time (235 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 77% on time; Before 9 AM: 91%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 235 flights
Find United 1322 fares Opens this date on Aviasales#5 · United 2382
10:31 PM → 11:44 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 76% of the time (88 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 88 flights
Find United 2382 fares Opens this date on Aviasales#6 · Republic 3624 · sold as American Eagle, Delta Connection or United Express
5:30 PM → 6:55 PM1h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 79%
- Cancelled
- 3.4%
- Avg arrival delay
- 26 min
- Arrived on time 79% of the time (28 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 77% on time; Before 9 AM: 91%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find 5:30 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines84%
1,064 flights · 85% on time as flown · 1.1% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)78%
270 flights · 78% on time as flown · 2.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
319 flights · avg delay 4 min
- Noon to 3 PM86%
319 flights · avg delay 10 min
- 3 to 6 PM77%
361 flights · avg delay 24 min
- After 9 PM81%
335 flights · avg delay 13 min
Best day: Tuesday (87%). Worst: Sunday (81%).
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 aircraft36%
- Airline (crew, maintenance, boarding)34%
- Air traffic control and airport volume15%
- Severe weather15%
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
IAD to RDU questions
- What time of day is best to fly IAD to RDU?
- Before 9 AM: 91% of flights arrived on time, against 77% for departures 3 to 6 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 IAD to RDU?
- United, with a season-adjusted 84% chance of operating and arriving on time over 1,064 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 IAD to RDU?
- June (74% on time); the best was February (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 IAD
- RDU to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- IAD to LAX 80%
- IAD to MCO 81%
- IAD to CLT 83%
- IAD to ORD 75%
- IAD to SEA 76%
- IAD to DFW 77%
- IAD to IAH 83%
- IAD to BOS 75%
- IAD to EWR 73%
Live status: FAA delays and ground stops