Flight number record
UA 2157
United Airlines · Houston to Salt Lake City
- Route
- IAH → SLC
- Departs
- 20:05
- Flights
- 314
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2157, check with United Airlines.
UA 2157 lands a B+, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 314 flights, with a median arrival 1 minute early.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 311 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.96%
National rate is 1.81%
1 hour+ late
8.7%
National rate is 8.1%
These figures cover 314 flights between July 2025 and June 2026. Beyond the headline rate, 8.7% 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 2157 flies
UA 2157 flies IAH to SLC without a single fixed slot. Its most common scheduled departure was 20:05, used on 71 of 314 flights, with 20:15 (55 flights) and 19:55 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 20:0571 flights22.6%
- Departs 20:1555 flights17.5%
- Departs 19:5551 flights16.2%
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 20:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 2157 runs 9 points better at 79.1%. 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 2157 next to IAH to SLC
Every carrier on IAH to SLC combined arrived on time 82.6% of the time across 1,957 flights, so UA 2157 is 4 points behind it. United flew 879 flights on the same city pair under all its flight numbers, including this one, and those ran 82.9% on time. Across its whole network United Airlines managed 79.0%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2157thin sample | 314 | 79.1% | 64 min | 0.96% | B+ |
| All United Airlines on IAH–SLC | 879 | 82.9% | 64 min | 0.68% | B+ |
| All carriers on IAH–SLC | 1,957 | 82.6% | 79 min | 0.51% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2157 quarter by quarter
UA 2157 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.1% on time and its weakest Apr–Jun 2026 at 72.2%, a swing of 12 points on roughly 79 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 202543 flights83.7%
- Oct–Dec 202590 flights78.9%
- Jan–Mar 202690 flights84.1%
- Apr–Jun 202691 flights72.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2157 did best on Saturday at 84.4% on time and worst on Friday at 71.1%. Each day rests on about 45 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2157 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 4,175 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.
- 58%Late-arriving aircraft
- 25%Carrier
- 13%National Airspace System
- 4%Extreme weather
58% 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 4,175 reported delay minutes here, that single category outweighs weather by 13 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 4,175 delay minutes reported on UA 2157.
Cancellations sit at 0.96% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
8.7% 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 about an hour, which a normal layover absorbs.
The 1,195 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 one other city pair in the data, including SAT to IAH (140), but none flew often enough under UA 2157 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to SLC only.
One caution: this is a thin sample. 314 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 2157
For a booking, read UA 2157 as 79.1% on time with 0.96% cancelled over 314 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to SLC, every carrier and departure
- SLC to IAH, the return direction
- Delta Air Lines 1583 on the same route84.9%
- United Airlines 2242 on the same route86.2%
- Delta Air Lines 1532 on the same route84.7%
- George Bush Intercontinental (IAH) delay statistics
- Salt Lake City International (SLC) 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.