Flight number record
UA 2157
United Airlines · Houston to Salt Lake City
- Route
- IAH → SLC
- Departs
- 20:25
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2157, check with United Airlines.
UA 2157 lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 362 flights, with a median arrival 2 minutes early.
Key figures
On time
76.9%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.83%
National rate is 1.89%
1 hour+ late
8.9%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. Beyond the headline rate, 8.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2157 flies
UA 2157 flies IAH to SLC without a single fixed slot. Its most common scheduled departure was 20:25, used on 81 of 362 flights, with 20:05 (71 flights) and 20:15 (55 flights) next.
- Departs 20:2581 flights22.4%
- Departs 20:0571 flights19.6%
- Departs 20:1555 flights15.2%
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 20:25 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and UA 2157 runs 7 points better at 76.9%. 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 2157 next to IAH to SLC
Every carrier on IAH to SLC combined arrived on time 83.4% of the time across 1,932 flights, so UA 2157 is 7 points behind it. United flew 856 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2157thin sample | 362 | 76.9% | 73 min | 0.83% | B+ |
| All United Airlines on IAH–SLC | 856 | 83.6% | 64 min | 0.47% | B+ |
| All carriers on IAH–SLC | 1,932 | 83.4% | 78 min | 0.47% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 Jul–Sep 2026 at 67.2%, a swing of 17 points on roughly 72 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 flights83.3%
- Oct–Dec 202590 flights78.9%
- Jan–Mar 202690 flights84.1%
- Apr–Jun 202691 flights72.2%
- Jul–Sep 202661 flights67.2%
Scale runs 60% to 90%.
By weekday, UA 2157 did best on Saturday at 84.3% on time and worst on Friday at 71.2%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2157 runs when it is late
UA 2157 often beats the schedule: 92 of 359 completed flights, 26%, arrived 15 minutes or more early. The 83 late arrivals split 22 under half an hour, 29 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early92 flights25.6%
- Within 15 min184 flights51.3%
- 15–29 min late22 flights6.1%
- 30–59 min late29 flights8.1%
- 1–2 hours late18 flights5.0%
- 2+ hours late14 flights3.9%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
A late pushback is often recovered here: of 105 departures that left 15 minutes late or more, 36 still arrived on time. 14 flights left on time and still arrived late.
The worst days
Worst days for UA 2157
The latest arrival of the period was on 10 August 2026, 5 hours 54 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Four of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 August 2026 | 5 hours 54 minutes | Late-arriving aircraft |
| 12 August 2026 | 5 hours 32 minutes | Carrier |
| 7 March 2026 | 5 hours 9 minutes | Late-arriving aircraft |
| 9 August 2026 | 4 hours 6 minutes | Late-arriving aircraft |
| 20 August 2026 | 3 hours 35 minutes | Late-arriving aircraft |
Delay causes
Why UA 2157 runs late
Late-arriving aircraft accounts for 57% of the 6,015 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Late-arriving aircraft
- 30%Carrier
- 10%National Airspace System
- 3%Extreme weather
57% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,015 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 6,015 delay minutes reported on UA 2157.
Cancellations are rare at 0.83%, 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
8.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over 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.
The same number turns up on one other city pair in the data, including SAT to IAH (127), 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. 362 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, UA 2157 is one of the weaker ways to fly IAH to SLC: 7 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
- IAH to SLC, every carrier and departure
- SLC to IAH, the return direction
- Delta Air Lines 1583 on the same route86.0%
- Delta Air Lines 1532 on the same route83.8%
- United Airlines 2242 on the same route86.0%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.