Washington (IAD) to Newark (EWR): On-Time Performance
Data through July 2026
When you fly IAD to EWR matters as much as anything else about the booking: the route swung from 89% on-time in May 2026 to just 33% in May 2025. Across the full period the route averages 70% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 57%), which matters most in the rough months.
- On-time
- 70%
- arrived <15 min late
- Avg delay
- 30 min
- completed flights
- Cancelled
- 2.7%
- Flights/day
- 4.2
- last 12 months
- Duration
- 1h 23m
- scheduled
- Distance
- 212 mi
Best airline from IAD to EWR
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 70% | 29 min | 2.2% | 2,991 |
| Republic Airways | 68% | 35 min | 14.3% | 133 |
Monthly on-time trend
Best time to fly from IAD to EWR
Aim for departures around 6 a.m. (96% on-time); avoid 3 p.m. departures (42%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 70% | 33 min |
| Tuesday | 72% | 24 min |
| Wednesdaybest | 74% | 28 min |
| Thursday | 67% | 32 min |
| Friday | 69% | 30 min |
| Saturday | 71% | 28 min |
| Sunday | 69% | 34 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft23%
- Airline operations18%
- National airspace system45%
- Weather14%
Frequently asked questions
- How often are flights from IAD to EWR delayed?
- 30% of IAD–EWR flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 30 minutes.
- Which airline is most reliable from IAD to EWR?
- United Airlines has the best on-time record on this route at 70%, based on 2,991 flights. 2 airlines flew IAD–EWR frequently enough to compare in this period.
- What is the best time of day to fly from IAD to EWR?
- Departures around 6 a.m. have the best record (96% on-time), while departures around 3 p.m. have the worst (42%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to EWR?
- The scheduled IAD–EWR flight time averages 1h 23m over 212 miles. Actual arrival times vary — flights on this route land 15+ minutes late 30% of the time.
- How often are IAD to EWR flights cancelled?
- 2.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from IAD to EWR?
- May 2025 was the roughest month in this dataset, with only 33% of arrivals on time. The best was May 2026 at 89%. If your dates are flexible, that 57-point gap is worth planning around.
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Based on 3,124 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.