Best Time to Fly PHL to IAD: On-Time Stats by Hour & Airline
Philadelphia International → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 86.6% of Philadelphia (PHL) to Washington (IAD) flights arrived on time (211 scheduled flights). That is 9.0 points above the national average of 77.6%.
Republic Airways was the only reporting airline with regular flights on this route.
June has been the best month (97% on time) and Thursday the weakest day of the week (83%).
4.3% of flights were cancelled, versus 1.8% nationally.
PHL 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 |
|---|---|---|---|---|
| Republic Airways | 86.6% | 48 min | 4.3% | 211 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHL to IAD
On-time arrival % by scheduled departure hour (local time), 216 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 94.4% | 1.4% | 72 |
| 10am–11am | 80.6% | 4.3% | 70 |
| 3pm–4pm | 85.7% | 5.4% | 37 |
| 7pm–8pm | Limited data | 6 | |
| 8pm–9pm | Limited data | 31 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHL 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) | Limited data | 11 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 12 | ||
| Summer peak (Jun 15 - Aug 15) | 90.8% | +5.6 pts | 2.6% | 78 |
| All other days | 85.2% | — | 6.1% | 115 |
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).