Best Time to Fly IAD to FLL: On-Time Stats by Hour & Airline
Washington Dulles International → Fort Lauderdale-Hollywood International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 80.8% of Washington (IAD) to Fort Lauderdale (FLL) flights arrived on time (781 scheduled flights). That is 3.2 points above the national average of 77.6%.
Among 2 airlines, United Airlines led with 83.9% on time and Frontier Airlines was last with 50.0%.
Over 24 months, Tuesday was the most reliable day (87% on time) and July the worst month (63%).
The cancellation rate was 0.8% (US average 1.8%).
IAD to FLL 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 | 83.9% | 70 min | 0.6% | 709 |
| Frontier Airlines | 50.0% | 82 min | 2.8% | 72 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to FLL
On-time arrival % by scheduled departure hour (local time), 1,549 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 86.9% | 0.4% | 524 |
| 9am–10am | Limited data | 1 | |
| 12pm–1pm | 81.9% | 0.0% | 72 |
| 1pm–2pm | 82.9% | 0.9% | 224 |
| 3pm–4pm | Limited data | 1 | |
| 4pm–5pm | Limited data | 4 | |
| 5pm–6pm | 77.5% | 1.1% | 545 |
| 6pm–7pm | 64.0% | 0.0% | 86 |
| 7pm–8pm | 89.1% | 0.0% | 92 |
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 FLL
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 | 28 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 77.8% | -6.5 pts | 0.0% | 90 |
| Summer peak (Jun 15 - Aug 15) | 70.0% | -14.3 pts | 1.4% | 277 |
| All other days | 84.3% | — | 0.5% | 1,154 |
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).