Best Time to Fly IAD to EWR: On-Time Stats by Hour & Airline
Washington Dulles International → Newark Liberty International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.2% of Washington (IAD) to Newark (EWR) flights arrived on time (1,532 scheduled flights). That is 1.4 points below the national average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (74% on time) and May the worst month (61%).
The cancellation rate was 2.6% (US average 1.8%).
IAD to EWR 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 | 76.1% | 95 min | 2.5% | 1,507 |
| Republic Airways | Limited data | 25 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to EWR
On-time arrival % by scheduled departure hour (local time), 3,004 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 6am–7am | 96.2% | 1.4% | 621 |
| 7am–8am | Limited data | 1 | |
| 8am–9am | 77.1% | 1.0% | 675 |
| 9am–10am | 57.1% | 0.0% | 35 |
| 12pm–1pm | 68.2% | 7.3% | 137 |
| 3pm–4pm | 42.1% | 3.8% | 79 |
| 5pm–6pm | 48.3% | 3.4% | 716 |
| 6pm–7pm | Limited data | 5 | |
| 9pm–10pm | Limited data | 6 | |
| 10pm–11pm | 68.7% | 3.6% | 728 |
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 EWR
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) | 68.6% | -4.4 pts | 0.0% | 51 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.2% | -2.9 pts | 0.9% | 105 |
| Summer peak (Jun 15 - Aug 15) | 60.2% | -12.9 pts | 5.9% | 540 |
| All other days | 73.0% | — | 2.0% | 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).