Best Time to Fly EWR to IAD: On-Time Stats by Hour & Airline
Newark Liberty International → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.2% of Newark (EWR) to Washington (IAD) flights arrived on time (1,534 scheduled flights). That is 2.4 points below the national average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (78% on time) and July the worst month (58%).
The cancellation rate was 2.7% (US average 1.8%).
EWR to IAD 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 | 75.2% | 70 min | 2.5% | 1,506 |
| Republic Airways | Limited data | 28 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly EWR to IAD
On-time arrival % by scheduled departure hour (local time), 3,005 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.8% | 1.6% | 63 |
| 6am–7am | 95.3% | 2.1% | 652 |
| 10am–11am | 84.7% | 0.7% | 138 |
| 12pm–1pm | Limited data | 1 | |
| 1pm–2pm | 73.1% | 1.3% | 79 |
| 2pm–3pm | 53.1% | 3.4% | 148 |
| 3pm–4pm | 67.6% | 1.9% | 574 |
| 6pm–7pm | 59.7% | 0.0% | 149 |
| 7pm–8pm | 62.8% | 3.7% | 570 |
| 8pm–9pm | 56.4% | 3.8% | 131 |
| 9pm–10pm | 69.0% | 3.5% | 492 |
| 10pm–11pm | Limited data | 8 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on EWR to IAD
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) | 74.0% | -1.5 pts | 0.0% | 50 |
| Christmas & New Year (Dec 20 - Jan 3) | 64.8% | -10.7 pts | 0.9% | 106 |
| Summer peak (Jun 15 - Aug 15) | 62.8% | -12.7 pts | 7.2% | 541 |
| All other days | 75.5% | — | 1.6% | 2,308 |
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).