Flight number record
UA 1627
United Airlines · Houston to Washington
- Route
- IAH → DCA
- Departs
- 18:05
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1627, check with United Airlines.
UA 1627 draws a C+. 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 363 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so UA 1627 runs 10 points behind the country as a whole. Across a thousand flights that is about 103 extra late arrivals.
Key figures
On time
67.0%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
14.1%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 14.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 270 of 363 flights, with 18:10 (51 flights) next.
- Departs 18:05270 flights74.4%
- Departs 18:1051 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 18:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1627 runs level with that at 67.0%. 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 1627 next to IAH to DCA
Every carrier on IAH to DCA combined arrived on time 75.3% of the time across 3,337 flights, so UA 1627 is 8 points behind it. United flew 2,385 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1627thin sample | 363 | 67.0% | 73 min | 0.55% | C+ |
| All United Airlines on IAH–DCA | 2,385 | 76.7% | 69 min | 0.67% | B+ |
| All carriers on IAH–DCA | 3,337 | 75.3% | 75 min | 2.31% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 2026 at 60.7%, a swing of 15 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 flights73.3%
- Oct–Dec 202591 flights75.8%
- Jan–Mar 202690 flights64.8%
- Apr–Jun 202691 flights62.6%
- Jul–Sep 202661 flights60.7%
Scale runs 50% to 80%.
By weekday, UA 1627 did best on Saturday at 72.0% on time and worst on Friday at 55.8%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1627 runs when it is late
The 119 late arrivals split 24 under half an hour, 44 between 30 and 60 minutes, and 51 an hour or more.
- 15+ min early88 flights24.4%
- Within 15 min154 flights42.7%
- 15–29 min late24 flights6.6%
- 30–59 min late44 flights12.2%
- 1–2 hours late31 flights8.6%
- 2+ hours late20 flights5.5%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
18 of 124 late departures made up the time and arrived on time, 15% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for UA 1627
The latest arrival of the period was on 26 January 2026, 12 hours 4 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in March 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 January 2026 | 12 hours 4 minutes | Extreme weather |
| 16 March 2026 | 3 hours 41 minutes | Late-arriving aircraft |
| 13 March 2026 | 3 hours 35 minutes | National Airspace System |
| 21 July 2026 | 3 hours 32 minutes | National Airspace System |
| 15 March 2026 | 3 hours 22 minutes | National Airspace System |
Delay causes
Why UA 1627 runs late
National Airspace System accounts for 62% of the 8,622 delay minutes carriers reported here, and the remaining four split what is left.
- 62%National Airspace System
- 16%Late-arriving aircraft
- 13%Extreme weather
- 9%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 8,622 delay minutes reported on UA 1627.
Cancellations are rare at 0.55%, below the national 1.89% 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
14.1% 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 1,208 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.
The same number turns up on five 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. 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 1627
For a booking, UA 1627 is a flight to put a long connection behind. 14.1% 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 654 on the same route77.7%
- United Airlines 2224 on the same route71.3%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.