Best Time to Fly IAD to TPA: On-Time Stats by Hour & Airline
Washington Dulles International → Tampa International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.4% of Washington (IAD) to Tampa (TPA) flights arrived on time (1,304 scheduled flights). That is 5.8 points above the national average of 77.6%.
United Airlines was the most punctual of the 2 airlines on the route at 83.7%, while Frontier Airlines trailed at 81.5%.
November has been the best month (90% on time) and Sunday the weakest day of the week (76%).
0.8% of flights were cancelled, versus 1.8% nationally.
IAD to TPA 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 | 83.7% | 62 min | 0.4% | 1,124 |
| Frontier Airlines | 81.5% | 69 min | 3.3% | 180 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to TPA
On-time arrival % by scheduled departure hour (local time), 2,751 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 87.4% | 1.5% | 525 |
| 9am–10am | 91.6% | 0.8% | 239 |
| 10am–11am | 73.3% | 0.0% | 30 |
| 11am–12pm | Limited data | 8 | |
| 12pm–1pm | 87.8% | 0.7% | 754 |
| 1pm–2pm | 83.3% | 2.7% | 37 |
| 2pm–3pm | Limited data | 28 | |
| 3pm–4pm | 68.3% | 0.0% | 141 |
| 4pm–5pm | Limited data | 22 | |
| 5pm–6pm | 69.8% | 1.7% | 591 |
| 6pm–7pm | 65.8% | 2.4% | 207 |
| 7pm–8pm | Limited data | 10 | |
| 8pm–9pm | Limited data | 14 | |
| 9pm–10pm | Limited data | 21 | |
| 10pm–11pm | 71.9% | 2.4% | 124 |
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 TPA
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) | 89.1% | +5.8 pts | 0.0% | 46 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.4% | -1.9 pts | 0.0% | 118 |
| Summer peak (Jun 15 - Aug 15) | 67.8% | -15.5 pts | 1.6% | 512 |
| All other days | 83.3% | — | 1.4% | 2,075 |
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).