Washington (IAD) to Jacksonville (JAX): On-Time Performance
Data through May 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 78% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 73%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 1.3%
- 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 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 81% | 14 min | 0.9% | 1,191 |
| Republic Airways | 80% | 9 min | 3.0% | 233 |
| Allegiant Air | 47% | 67 min | 1.7% | 119 |
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 (55%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 24 min |
| Tuesday | 80% | 14 min |
| Wednesdaybest | 85% | 12 min |
| Thursday | 81% | 14 min |
| Friday | 74% | 24 min |
| Saturday | 80% | 11 min |
| Sunday | 75% | 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 operations28%
- National airspace system22%
- Weather14%
Frequently asked questions
- How often are flights from IAD to JAX delayed?
- 22% of IAD–JAX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from IAD to JAX?
- United Airlines has the best on-time record on this route at 81%, based on 1,191 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 (55%). 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 22% of the time.
- How often are IAD to JAX flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, 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.
Explore related pages
More routes from IAD
Based on 1,543 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.