Washington (IAD) to Jacksonville (JAX): On-Time Performance
Data through July 2026
Washington (IAD) to Jacksonville (JAX) effectively runs on two schedules. In September 2025, 91% of arrivals were on time; in May 2025 that fell to 61% — a 31-point seasonal swing. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 72%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 2.1
- last 12 months
- Duration
- 2h 12m
- scheduled
- Distance
- 631 mi
Best airline from IAD to JAX
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 80% | 15 min | 1.0% | 1,255 |
| Republic Airways | 78% | 10 min | 3.4% | 203 |
| Allegiant Air | 49% | 65 min | 1.6% | 129 |
Monthly on-time trend
Best time to fly from IAD to JAX
Aim for departures around 9 a.m. (87% on-time); avoid 6 p.m. departures (56%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 24 min |
| Tuesday | 79% | 15 min |
| Wednesdaybest | 84% | 12 min |
| Thursday | 78% | 18 min |
| Friday | 72% | 26 min |
| Saturday | 79% | 14 min |
| Sunday | 76% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations27%
- National airspace system22%
- Weather15%
Frequently asked questions
- How often are flights from IAD to JAX delayed?
- 23% of IAD–JAX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 19 minutes.
- Which airline is most reliable from IAD to JAX?
- United Airlines has the best on-time record on this route at 80%, based on 1,255 flights. 3 airlines flew IAD–JAX frequently enough to compare in this period.
- What is the best time of day to fly from IAD to JAX?
- Departures around 9 a.m. have the best record (87% on-time), while departures around 6 p.m. have the worst (56%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to JAX?
- The scheduled IAD–JAX flight time averages 2h 12m over 631 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are IAD to JAX flights cancelled?
- 1.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IAD to JAX?
- May 2025 was the roughest month in this dataset, with only 61% of arrivals on time. The best was September 2025 at 91%. If your dates are flexible, that 31-point gap is worth planning around.
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Based on 1,587 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.