Best Time to Fly FLL to IAD: On-Time Stats by Hour & Airline
Fort Lauderdale-Hollywood International → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.6% of Fort Lauderdale (FLL) to Washington (IAD) flights arrived on time (782 scheduled flights). That is 5.9 points above the national average of 77.6%.
Among 2 airlines, United Airlines led with 86.4% on time and Frontier Airlines was last with 53.7%.
Over 24 months, Tuesday was the most reliable day (92% on time) and July the worst month (74%).
The cancellation rate was 1.0% (US average 1.8%).
FLL 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 |
|---|---|---|---|---|
| United Airlines | 86.4% | 72 min | 0.6% | 710 |
| Frontier Airlines | 53.7% | 108 min | 5.6% | 72 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly FLL to IAD
On-time arrival % by scheduled departure hour (local time), 1,550 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 91.7% | 0.3% | 340 |
| 9am–10am | 88.3% | 0.0% | 128 |
| 11am–12pm | 94.4% | 0.0% | 36 |
| 12pm–1pm | 86.5% | 0.4% | 538 |
| 1pm–2pm | 78.6% | 0.7% | 155 |
| 4pm–5pm | Limited data | 4 | |
| 5pm–6pm | 61.0% | 4.5% | 111 |
| 6pm–7pm | 82.5% | 1.3% | 238 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on FLL 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 | 28 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 77.8% | -8.8 pts | 0.0% | 90 |
| Summer peak (Jun 15 - Aug 15) | 79.0% | -7.5 pts | 1.8% | 277 |
| All other days | 86.6% | — | 0.6% | 1,155 |
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).