Flight number record
UA 1627
United Airlines · Houston to Washington
- Route
- IAH → DCA
- Departs
- 18:05
- Flights
- 360
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1627, check with United Airlines.
UA 1627 draws a D+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 360 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so UA 1627 runs 13 points behind the country as a whole. Across a thousand flights that is about 134 extra late arrivals.
Key figures
On time
64.2%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.81%
1 hour+ late
15.4%
National rate is 8.1%
These figures cover 360 flights between July 2025 and June 2026. Beyond the headline rate, 15.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When UA 1627 flies
UA 1627 flies IAH to DCA without a single fixed slot. Its most common scheduled departure was 18:05, used on 272 of 360 flights, with 18:10 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:05272 flights75.6%
- Departs 18:1051 flights14.2%
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 18:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1627 runs 4 points worse at 64.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
UA 1627 next to IAH to DCA
Every carrier on IAH to DCA combined arrived on time 74.8% of the time across 3,202 flights, so UA 1627 is 11 points behind it. United flew 2,413 flights on the same city pair under all its flight numbers, including this one, and those ran 75.2% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1627thin sample | 360 | 64.2% | 75 min | 0.56% | D+ |
| All United Airlines on IAH–DCA | 2,413 | 75.2% | 70 min | 0.79% | B+ |
| All carriers on IAH–DCA | 3,202 | 74.8% | 73 min | 1.81% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1627 quarter by quarter
UA 1627 did not run the same all year. Its best quarter was Oct–Dec 2025 at 75.8% on time and its weakest Jul–Sep 2025 at 53.4%, a swing of 22 points on roughly 90 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 202588 flights53.4%
- Oct–Dec 202591 flights75.8%
- Jan–Mar 202690 flights64.8%
- Apr–Jun 202691 flights62.6%
Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1627 did best on Tuesday at 75.5% on time and worst on Thursday at 56.9%. Each day rests on about 51 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1627 runs late
One category carries most of the weight here. National Airspace System accounts for 54% of the 9,602 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%National Airspace System
- 21%Late-arriving aircraft
- 13%Extreme weather
- 11%Carrier
Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.2 times the usual weather exposure. The split is drawn from 9,602 delay minutes reported on UA 1627.
Cancellations are rare at 0.56%, 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 1,208 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 LGA to IAH (51), ORD to LGA (30) and OMA to IAH (26), but none flew often enough under UA 1627 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to DCA only.
One caution: this is a thin sample. 360 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 1627
For a booking, UA 1627 is a flight to put a long connection behind. 15.4% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- IAH to DCA, every carrier and departure
- DCA to IAH, the return direction
- United Airlines 2224 on the same route69.8%
- United Airlines 2311 on the same route83.6%
- United Airlines 654 on the same route75.8%
- United Airlines 512 on the same route93.6%
- George Bush Intercontinental (IAH) delay statistics
- Ronald Reagan Washington National (DCA) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.