Best Time to Fly IAD to JAX: On-Time Stats by Hour & Airline
Washington Dulles International → Jacksonville International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.5% of Washington (IAD) to Jacksonville (JAX) flights arrived on time (778 scheduled flights). That is 5.9 points above the national average of 77.6%.
Among 3 airlines, Republic Airways led with 88.8% on time and Allegiant Air was last with 59.0%.
Over 24 months, Wednesday was the most reliable day (86% on time) and June the worst month (67%).
The cancellation rate was 0.9% (US average 1.8%).
IAD to JAX 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 | 88.8% | 29 min | 1.1% | 90 |
| United Airlines | 85.2% | 80 min | 1.0% | 627 |
| Allegiant Air | 59.0% | 109 min | 0.0% | 61 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to JAX
On-time arrival % by scheduled departure hour (local time), 1,495 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 84.3% | 0.4% | 479 |
| 9am–10am | 86.8% | 2.1% | 93 |
| 12pm–1pm | 69.4% | 2.7% | 37 |
| 1pm–2pm | Limited data | 25 | |
| 2pm–3pm | Limited data | 9 | |
| 3pm–4pm | 86.1% | 0.0% | 36 |
| 5pm–6pm | 76.3% | 1.9% | 699 |
| 6pm–7pm | 59.3% | 0.0% | 113 |
| 7pm–8pm | Limited data | 4 | |
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 JAX
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) | 64.5% | -16.9 pts | 0.0% | 31 |
| Christmas & New Year (Dec 20 - Jan 3) | 61.5% | -19.9 pts | 0.0% | 39 |
| Summer peak (Jun 15 - Aug 15) | 68.5% | -12.9 pts | 3.5% | 282 |
| All other days | 81.4% | — | 0.8% | 1,143 |
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).