Flight number record
UA 2408
United Airlines · Denver to Washington
- Route
- DEN → IAD
- Departs
- 17:59
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2408, check with United Airlines.
UA 2408 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 363 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so UA 2408 runs 6 points behind the country as a whole. Across a thousand flights that is about 57 extra late arrivals.
Key figures
On time
71.6%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
9.7%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2408 flies
UA 2408 flies DEN to IAD without a single fixed slot. Its most common scheduled departure was 17:59, used on 114 of 363 flights, with 18:00 (101 flights) and 17:56 (51 flights) next.
- Departs 17:59114 flights31.4%
- Departs 18:00101 flights27.8%
- Departs 17:5651 flights14.0%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 2408 runs 4 points better at 71.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 2408 next to DEN to IAD
Every carrier on DEN to IAD combined arrived on time 81.8% of the time across 3,385 flights, so UA 2408 is 10 points behind it. United flew 2,790 flights on the same city pair under all its flight numbers, including this one, and those ran 84.8% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2408thin sample | 363 | 71.6% | 67 min | 1.10% | C |
| All United Airlines on DEN–IAD | 2,790 | 84.8% | 66 min | 0.50% | B+ |
| All carriers on DEN–IAD | 3,385 | 81.8% | 60 min | 0.59% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2408 quarter by quarter
UA 2408 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.7% on time and its weakest Jul–Sep 2026 at 53.3%, a swing of 27 points on roughly 73 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 202530 flights53.3%
- Oct–Dec 202590 flights80.0%
- Jan–Mar 202690 flights80.7%
- Apr–Jun 202691 flights72.5%
- Jul–Sep 202662 flights53.3%
Scale runs 45% to 85%.
By weekday, UA 2408 ranged from 64.7% on Sunday to 75.5% on Friday. With about 52 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.
Arrival by arrival
How late UA 2408 runs when it is late
The 102 late arrivals split 36 under half an hour, 31 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early75 flights20.9%
- Within 15 min182 flights50.7%
- 15–29 min late36 flights10.0%
- 30–59 min late31 flights8.6%
- 1–2 hours late23 flights6.4%
- 2+ hours late12 flights3.3%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
22 of 84 late departures made up the time and arrived on time, 26% of them. In the other direction, 40 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IAD.
The worst days
Worst days for UA 2408
The latest arrival of the period was on 17 February 2026, 11 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 February 2026 | 11 hours 32 minutes | Carrier |
| 8 June 2026 | 7 hours 21 minutes | Carrier |
| 19 April 2026 | 5 hours 11 minutes | Security |
| 12 March 2026 | 4 hours 41 minutes | Carrier |
| 29 July 2026 | 2 hours 51 minutes | Late-arriving aircraft |
Delay causes
Why UA 2408 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,796 reported delay minutes.
- 34%Carrier
- 32%Late-arriving aircraft
- 29%National Airspace System
- 5%Security
- 1%Extreme weather
No single cause dominates. carrier at 34%, late-arriving aircraft at 32% and national airspace system at 29% split the 6,796 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around. The split is drawn from 6,796 delay minutes reported on UA 2408.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
The same number turns up on one other city pair in the data, including SFO to BZN (2), but none flew often enough under UA 2408 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. 363 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 2408
For a booking, UA 2408 is one of the weaker ways to fly DEN to IAD: 10 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- DEN to IAD, every carrier and departure
- IAD to DEN, the return direction
- United Airlines 2087 on the same route81.4%
- United Airlines 1924 on the same route93.8%
- United Airlines 347 on the same route87.0%
- United Airlines 1101 on the same route93.8%
- 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
- How often a connection fails at the major US hubs
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.