Best Time to Fly IAD to PBI: On-Time Stats by Hour & Airline
Washington Dulles International → Palm Beach International
Data through July 2026 · Last updated October 18, 2026
334 flights were scheduled from Washington (IAD) to West Palm Beach/Palm Beach (PBI) in the last 12 months, and 81.4% of those that flew arrived on time, 3.8 points above the US average of 77.6%.
Among 2 airlines, Republic Airways led with 83.3% on time and United Airlines was last with 81.2%.
Over 24 months, Saturday was the most reliable day (87% on time) and December the worst month (74%).
The cancellation rate was 1.2% (US average 1.8%).
IAD to PBI 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 | 83.3% | 39 min | 0.0% | 31 |
| United Airlines | 81.2% | 80 min | 1.3% | 303 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to PBI
On-time arrival % by scheduled departure hour (local time), 374 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 85.3% | 2.6% | 77 |
| 9am–10am | 77.3% | 0.9% | 112 |
| 1pm–2pm | 83.3% | 0.0% | 31 |
| 5pm–6pm | 78.2% | 1.0% | 102 |
| 6pm–7pm | 90.9% | 0.0% | 33 |
| 8pm–9pm | Limited data | 19 | |
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 PBI
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 | 7 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 77.8% | -4.8 pts | 0.0% | 45 |
| All other days | 82.6% | — | 1.2% | 322 |
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).