Carrier route record
UAJAX→IAD
United Airlines · Jacksonville to Washington
- Flights
- 591
- Period
- July 2025 to June 2026
- Share of route
- 77%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on JAX to IAD earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 591 flights, with a median arrival 14 minutes early.
Set against the rest of the country, United's JAX to IAD record is 13 points better than the US average of 77.6%. That gap is worth roughly 130 fewer late arrivals for every thousand flights.
Key figures
On time
90.6%
Arrivals under 15 minutes late, of 584 completed flights
Avg delay
99 min
Across delayed arrivals only, not all flights
Cancelled
1.02%
National rate is 1.81%
Whole route
88.0%
Every carrier on JAX to IAD, 771 flights
These figures cover 591 flights between July 2025 and June 2026. The median arrival is 14 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Carrier by carrier
United against every carrier on JAX to IAD
United flew 591 of the 771 flights on JAX to IAD, most of the route. Its 90.6% on time is 3 points better than the route as a whole, which runs 88.0%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Republic at 94.0% to Allegiant at 51.7%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 120 | 94.0% | 103 min | 2.50% | A |
| United Airlines (this page) | 591 | 90.6% | 99 min | 1.02% | A |
| Allegiant Airthin sample | 60 | 51.7% | 53 min | 0.00% | F+ |
Flight by flight
United flight numbers on JAX to IAD
Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 14 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am227 flights92.4%
- 11am–2pm249 flights93.5%
- 2pm–5pm72 flights80.0%
- 5pm–8pm43 flights81.4%
- 8pm–5am—
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 93.5% on time, ahead of 2pm–5pm at 80.0%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 11am–2pm window is the busiest, with 249 flights scheduled in it.
Across the year
United on JAX to IAD through the year
April is the best month on the calendar at 96.7% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 86 flights.
Across the week, Saturday is the strongest day at 94.2% on time and Monday the weakest at 86.5%. 8 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United runs late on this route
One category carries most of the weight here. Carrier accounts for 48% of the 5,457 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 48%Carrier
- 35%National Airspace System
- 15%Late-arriving aircraft
- 3%Extreme weather
35% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,885 minutes out of 5,457, against a national NAS share of 21%. The split is drawn from 5,457 reported delay minutes.
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,621 of the 5,457 delay minutes reported here.
Cancellations sit at 1.02% against a national 1.81%, which is ordinary. Diversions add another 0.17%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 631 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 86.2% on time across 592 flights, 4 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
One caution: this is a thin sample. 591 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking United on JAX to IAD
Put together: treat all of this as provisional. 591 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 90.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 584 completed flights over 12 months sit behind that.
Related
Where to go next
- JAX to IAD, every carrier
- United on IAD to JAX, the return leg
- Republic Airways on JAX to IAD94.0%
- United Airlines network-wide record
- Washington Dulles International (IAD) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.