Best Time to Fly IAD to RDU: On-Time Stats by Hour & Airline
Washington Dulles International → Raleigh-Durham International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.2% of Washington (IAD) to Raleigh/Durham (RDU) flights arrived on time (1,300 scheduled flights). That is 5.6 points above the national average of 77.6%.
Among 2 airlines, United Airlines led with 83.7% on time and Republic Airways was last with 80.7%.
Over 24 months, Saturday was the most reliable day (87% on time) and June the worst month (75%).
The cancellation rate was 1.3% (US average 1.8%).
IAD to RDU on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 83.7% | 69 min | 1.2% | 1,083 |
| Republic Airways | 80.7% | 78 min | 1.8% | 217 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to RDU
On-time arrival % by scheduled departure hour (local time), 2,317 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 89.3% | 0.2% | 545 |
| 12pm–1pm | 88.2% | 1.6% | 371 |
| 1pm–2pm | 84.3% | 2.4% | 85 |
| 3pm–4pm | 73.0% | 0.0% | 111 |
| 5pm–6pm | 77.6% | 1.2% | 580 |
| 6pm–7pm | Limited data | 1 | |
| 10pm–11pm | 80.3% | 2.4% | 624 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAD to RDU
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 88.5% | +4.0 pts | 0.0% | 52 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.0% | -3.4 pts | 0.0% | 95 |
| Summer peak (Jun 15 - Aug 15) | 74.0% | -10.4 pts | 3.6% | 358 |
| All other days | 84.4% | — | 1.0% | 1,812 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).