Route profile
JAX→IAD
Flight reliability, delays and best times to fly from Jacksonville to Washington, 630 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 68% of comparable major US routes (4,598 compared)
Calculated from 2,478 flights. How this is calculated · What counts as on time
JAX → IAD arrives on time 84.5% of the time; the return trip, IAD → JAX, arrives on time 78.6% of the time, a 5.8-point gap between the two directions of the same city pair.
JAX → IAD spends 22.1 minutes on the ground on a 630-mile trip: 14.7 minutes from pushback to wheels-up at JAX and 7.4 minutes from touchdown to gate at IAD.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
The airline matters unusually much on this route, a wider carrier-to-carrier gap than 95% of 2,692 comparable routes.
Republic Airways arrived on time 87.9% of the time, against 67.0% for Allegiant Air, flying the exact same route.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 2,692 in the comparison.
What sets this route apart
Where JAX to IAD differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
JAX to IAD is at its best against routes of similar length for flights scheduled at 7 PM: 85.5% arrive on time, 17.6 points ahead of the 67.9% those routes manage at that hour. Against all other routes the gap is 17.7 points.
JAX to IAD holds up on Sundays better than routes of similar length do: 84.9% on time to their 74.8%, a 10.1 points lead. Against all other routes the gap is 10.1 points.
June is kinder to JAX to IAD than to routes of similar length: 85.0% on time against 72.4%, 12.6 points better. Against all other routes the gap is 12.3 points.
United Airlines does better on JAX to IAD than on its routes of similar length: 85.9% on time here, 78.1% there, 7.8 points apart. Against all other routes the gap is 6 points.
JAX to IAD against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 7 PM departures | 85.5% | routes of similar length | 67.9% | +17.6 pts | 339 here, 118,158 there |
| Weekday: Sunday | 84.9% | routes of similar length | 74.8% | +10.1 pts | 318 here, 301,656 there |
| Month: June | 85.0% | routes of similar length | 72.4% | +12.6 pts | 226 here, 169,356 there |
| Airline: United Airlines | 85.9% | routes of similar length | 78.1% | +7.8 pts | 1,926 here, 217,758 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 630 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
When it goes wrong
July 2023 – July 2026
33 min late
against a median of 9 min early
Percentiles over 2,478 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at IAD after arriving from JAX.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 28% | High risk |
| 45 min | 15% | High risk |
| 60 min | 11% | Some risk |
| 90 min | 6.3% | Some risk |
| 120 min | 4.6% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.05% of the time and diverts 0.20% of the time, which a late arrival never shows up in.
Chance of missing is the share of 2,447 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 33 minutes late (90th-percentile gate arrival delay), over 2,478 operations.
Any other layover length: connection checker.
Best time to fly
JAX → IAD flights departing 9 AM–12 PM arrived on time 90.5% of the time, against 63.8% for 3–6 PM departures, a gap of 26.7 percentage points.
By departure window
By departure hour
- 12 AM to 8 AM: too few flights to score
- 9 AM: 91.1% on time from 891 flights
- 10 AM to 11 AM: too few flights to score
- 12 PM: 91.5% on time from 153 flights
- 1 PM: 89.7% on time from 185 flights
- 2 PM: 76.7% on time from 613 flights
- 3 PM to 6 PM: too few flights to score
- 7 PM: 85.5% on time from 339 flights
- 8 PM to 11 PM: too few flights to score
Why JAX → IAD runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for JAX → IAD. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| United Airlines | 1,949 | 85.9% | 0.97% | -10 min | 5.8% |
| Republic Airways | 310 | 87.9% | 1.29% | -13 min | 4.6% |
| Allegiant Air | 219 | 67.0% | 1.37% | 1 min | 12.6% |
United Airlines flew 78.7% of the 2,478 flights listed.
Republic Airways arrived on time 20.9 percentage points more often than Allegiant Air on this route.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Friday the least, a gap of 9.8 percentage points.
By month
- Jan: 84.8%
- Feb: 89.0%
- Mar: 85.0%
- Apr: 91.4%
- May: 81.5%
- Jun: 85.0%
- Jul: 73.9%
- Aug: 80.3%
- Sep: 88.6%
- Oct: 93.2%
- Nov: 83.6%
- Dec: 84.1%
July is historically the weakest month and October the strongest, a spread of 19.3 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 88.6% against 84.1% in the 12 months before — improving by 4.5 percentage points.
Data and methodology
Calculated by FlyerIntel from 2,478 JAX → IAD flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed