Flight number record
UA 2084
United Airlines · Washington to Jacksonville
- Route
- IAD → JAX
- Departs
- 08:45
- Flights
- 268
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2084, check with United Airlines.
UA 2084 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 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 268 flights, with a median arrival 15 minutes early.
Set against the rest of the country, UA 2084's record is 12 points better than the US average of 77.6%. That gap is worth roughly 118 fewer late arrivals for every thousand flights.
Key figures
On time
89.4%
Arrivals under 15 minutes late, of 265 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.12%
National rate is 1.81%
1 hour+ late
3.4%
National rate is 8.1%
These figures cover 268 flights between July 2025 and June 2026. The median arrival is 15 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.
Schedule
When UA 2084 flies
UA 2084 flies IAD to JAX without a single fixed slot. Its most common scheduled departure was 08:45, used on 107 of 268 flights, with 09:00 (64 flights) and 08:59 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 08:45107 flights39.9%
- Departs 09:0064 flights23.9%
- Departs 08:5932 flights11.9%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 08:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 2084 runs 5 points better at 89.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
UA 2084 next to IAD to JAX
Every carrier on IAD to JAX combined arrived on time 83.1% of the time across 772 flights, so UA 2084 is 6 points ahead of it. United flew 592 flights on the same city pair under all its flight numbers, including this one, and those ran 86.2% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2084thin sample | 268 | 89.4% | 69 min | 1.12% | A |
| All United Airlines on IAD–JAX | 592 | 86.2% | 81 min | 0.68% | A+ |
| All carriers on IAD–JAX | 772 | 83.1% | 82 min | 1.30% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2084 quarter by quarter
Quarter by quarter UA 2084 held fairly steady: 87.7% in Jul–Sep 2025, 94.4% in Oct–Dec 2025, 90.5% in Jan–Mar 2026 and 88.2% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202582 flights87.7%
- Oct–Dec 202536 flights94.4%
- Jan–Mar 202665 flights90.5%
- Apr–Jun 202685 flights88.2%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2084 ranged from 85.7% on Tuesday to 92.9% on Monday. With about 38 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why UA 2084 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 51% of the 1,930 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.
- 51%Late-arriving aircraft
- 31%Carrier
- 15%National Airspace System
- 2%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 1,930 reported delay minutes here, that single category outweighs weather by 23 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,930 delay minutes reported on UA 2084.
Cancellations sit at 1.12% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.4% 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 same number turns up on five other city pairs in the data, including JAX to IAH (67), ORD to IAH (19) and EWR to ORD (4), but none flew often enough under UA 2084 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to JAX only.
One caution: this is a thin sample. 268 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 UA 2084
For a booking, UA 2084 has one of the better records a US domestic flight can show: 89.4% on time and 1.12% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- IAD to JAX, every carrier and departure
- JAX to IAD, the return direction
- Washington Dulles International (IAD) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.