Flight number record
UA 1108
United Airlines · Washington to Charleston
- Route
- IAD → CHS
- Departs
- 08:15
- Flights
- 252
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1108, check with United Airlines.
UA 1108 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 77.3%. When something does go wrong the average delay runs about 40 minutes. That rests on 252 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 1108's record is 13 points better than the US average of 77.3%. That gap is worth roughly 132 fewer late arrivals for every thousand flights.
Key figures
On time
90.5%
Arrivals under 15 minutes late, of 252 completed flights
Avg delay
40 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.0%
National rate is 8.3%
These figures cover 252 flights between September 2025 and August 2026. The median arrival is 7 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.
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Schedule
When UA 1108 flies
UA 1108 flies IAD to CHS without a single fixed slot. Its most common scheduled departure was 08:15, used on 70 of 252 flights, with 08:20 (56 flights) and 08:25 (54 flights) next.
- Departs 08:1570 flights27.8%
- Departs 08:2056 flights22.2%
- Departs 08:2554 flights21.4%
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 08:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1108 runs 7 points better at 90.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1108 next to IAD to CHS
Every carrier on IAD to CHS combined arrived on time 86.6% of the time across 764 flights, so UA 1108 is 4 points ahead of it. United flew 490 flights on the same city pair under all its flight numbers, including this one, and those ran 88.1% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1108thin sample | 252 | 90.5% | 40 min | 0.00% | A+ |
| All United Airlines on IAD–CHS | 490 | 88.1% | 81 min | 0.82% | A+ |
| All carriers on IAD–CHS | 764 | 86.6% | 76 min | 1.18% | A |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1108 quarter by quarter
UA 1108 did not run the same all year. Its best quarter was Jan–Mar 2026 at 94.9% on time and its weakest Jul–Sep 2026 at 83.9%, a swing of 11 points on roughly 63 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 202517 flights—
- Oct–Dec 202548 flights93.8%
- Jan–Mar 202639 flights94.9%
- Apr–Jun 202686 flights90.7%
- Jul–Sep 202662 flights83.9%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1108 ranged from 90.0% on Tuesday to 93.9% on Wednesday. With about 36 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1108 runs when it is late
Most of the lateness is short. 17 of the 24 late arrivals were under half an hour behind, and 5 reached an hour or more.
- 15+ min early48 flights19.0%
- Within 15 min180 flights71.4%
- 15–29 min late17 flights6.7%
- 30–59 min late2 flights0.8%
- 1–2 hours late4 flights1.6%
- 2+ hours late1 flights0.4%
Scale runs 0% to 100%.
Share of 252 completed flights by arrival against schedule.
Only 16 of 252 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 1108
The latest arrival of the period was on 3 August 2026, 3 hours 15 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 August 2026 | 3 hours 15 minutes | Late-arriving aircraft |
| 7 July 2026 | 1 hour 53 minutes | Carrier |
| 31 August 2026 | 1 hour 32 minutes | Carrier |
| 18 June 2026 | 1 hour 21 minutes | National Airspace System |
| 1 September 2025 | 1 hour | Carrier |
Delay causes
Why UA 1108 runs late
Carrier accounts for 45% of the 950 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Carrier
- 29%National Airspace System
- 27%Late-arriving aircraft
The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 424 of the 950 delay minutes reported here. The split is drawn from 950 delay minutes reported on UA 1108.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.0% land an hour or more behind schedule, against 8.3% 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 same number turns up on six other city pairs in the data, including IAH to BWI (36), MIA to ORD (19) and EWR to RDU (16), but none flew often enough under UA 1108 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to CHS only.
One caution: this is a thin sample. 252 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 1108
For a booking, UA 1108 has one of the better records a US domestic flight can show: 90.5% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- IAD to CHS, every carrier and departure
- CHS to IAD, the return direction
- Washington Dulles International (IAD) delay statistics
- Charleston International (CHS) 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
- Worst months to fly in the US, ranked by the data
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.