Flight number record
UA 347
United Airlines · Denver to Washington
- Route
- DEN → IAD
- Departs
- 13:30
- Flights
- 312
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 347, check with United Airlines.
UA 347 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 312 flights, with a median arrival 11 minutes early.
Set against the rest of the country, UA 347's record is 9 points better than the US average of 77.6%. That gap is worth roughly 92 fewer late arrivals for every thousand flights.
Key figures
On time
86.8%
Arrivals under 15 minutes late, of 310 completed flights
Avg delay
106 min
Across delayed arrivals only, not all flights
Cancelled
0.32%
National rate is 1.81%
1 hour+ late
7.4%
National rate is 8.1%
These figures cover 312 flights between July 2025 and June 2026. The median arrival is 11 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 347 flies
UA 347 flies DEN to IAD without a single fixed slot. Its most common scheduled departure was 13:30, used on 72 of 312 flights, with 13:25 (49 flights) and 13:53 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:3072 flights23.1%
- Departs 13:2549 flights15.7%
- Departs 13:5341 flights13.1%
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 13:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 347 runs 8 points better at 86.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 347 next to DEN to IAD
Every carrier on DEN to IAD combined arrived on time 80.3% of the time across 3,558 flights, so UA 347 is 7 points ahead of it. United flew 2,797 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 347thin sample | 312 | 86.8% | 106 min | 0.32% | A+ |
| All United Airlines on DEN–IAD | 2,797 | 84.4% | 70 min | 0.46% | B+ |
| All carriers on DEN–IAD | 3,558 | 80.3% | 64 min | 0.56% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 347 quarter by quarter
UA 347 did not run the same all year. Its best quarter was Oct–Dec 2025 at 97.4% on time and its weakest Jul–Sep 2025 at 74.1%, a swing of 23 points on roughly 78 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202555 flights74.1%
- Oct–Dec 202576 flights97.4%
- Jan–Mar 202690 flights83.1%
- Apr–Jun 202691 flights89.0%
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 347 ranged from 80.0% on Friday to 91.1% on Thursday. With about 45 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why UA 347 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 54% of the 4,347 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.
- 54%Late-arriving aircraft
- 29%Carrier
- 15%National Airspace System
- 2%Extreme weather
54% 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 4,347 reported delay minutes here, that single category outweighs weather by 36 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 4,347 delay minutes reported on UA 347.
Cancellations are rare at 0.32%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
7.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.
The 1,452 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 four other city pairs in the data, including RNO to DEN (225), RAP to DEN (67) and SAN to DEN (31), but none flew often enough under UA 347 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to IAD only.
One caution: this is a thin sample. 312 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 347
For a booking, UA 347 has one of the better records a US domestic flight can show: 86.8% on time and 0.32% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to IAD, every carrier and departure
- IAD to DEN, the return direction
- United Airlines 2408 on the same route68.6%
- United Airlines 2087 on the same route80.1%
- United Airlines 1924 on the same route93.5%
- United Airlines 798 on the same route83.0%
- United Airlines 1101 on the same route94.5%
- Denver International (DEN) delay statistics
- 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.