Flight number record
UA 2149
United Airlines · Denver to Sacramento
- Route
- DEN → SMF
- Departs
- 08:00
- Flights
- 308
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2149, check with United Airlines.
UA 2149 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 308 flights, with a median arrival 14 minutes early.
Set against the rest of the country, UA 2149's record is 16 points better than the US average of 77.3%. That gap is worth roughly 159 fewer late arrivals for every thousand flights.
Key figures
On time
93.2%
Arrivals under 15 minutes late, of 308 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.3%
National rate is 8.3%
These figures cover 308 flights between September 2025 and August 2026. The median arrival is 14 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 2149 flies
UA 2149 flies DEN to SMF without a single fixed slot. Its most common scheduled departure was 08:00, used on 135 of 308 flights, with 07:50 (45 flights) and 08:15 (31 flights) next.
- Departs 08:00135 flights43.8%
- Departs 07:5045 flights14.6%
- Departs 08:1531 flights10.1%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 2149 runs 9 points better at 93.2%. 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 2149 next to DEN to SMF
Every carrier on DEN to SMF combined arrived on time 73.2% of the time across 3,853 flights, so UA 2149 is 20 points ahead of it. United flew 1,791 flights on the same city pair under all its flight numbers, including this one, and those ran 80.5% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2149thin sample | 308 | 93.2% | 56 min | 0.00% | A+ |
| All United Airlines on DEN–SMF | 1,791 | 80.5% | 62 min | 0.11% | B+ |
| All carriers on DEN–SMF | 3,853 | 73.2% | 56 min | 0.29% | C+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2149 quarter by quarter
Quarter by quarter UA 2149 held fairly steady: 94.2% in Oct–Dec 2025, 93.7% in Jan–Mar 2026, 93.4% in Apr–Jun 2026 and 93.5% in Jul–Sep 2026. A spread of about a point is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202524 flights—
- Oct–Dec 202552 flights94.2%
- Jan–Mar 202679 flights93.7%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights93.5%
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2149 ranged from 90.7% on Friday to 95.7% on Tuesday. With about 44 flights behind each day, a spread of 5 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2149 runs when it is late
UA 2149 often beats the schedule: 152 of 308 completed flights, 49%, arrived 15 minutes or more early. The 21 late arrivals split 8 under half an hour, 6 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early152 flights49.4%
- Within 15 min135 flights43.8%
- 15–29 min late8 flights2.6%
- 30–59 min late6 flights1.9%
- 1–2 hours late4 flights1.3%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 308 completed flights by arrival against schedule.
Only 18 of 308 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 2149
The latest arrival of the period was on 18 September 2025, 2 hours 44 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in September 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 September 2025 | 2 hours 44 minutes | Late-arriving aircraft |
| 6 September 2025 | 2 hours 39 minutes | Carrier |
| 15 May 2026 | 2 hours 7 minutes | Late-arriving aircraft |
| 22 May 2026 | 1 hour 57 minutes | Carrier |
| 9 September 2025 | 1 hour 32 minutes | National Airspace System |
Delay causes
Why UA 2149 runs late
Late-arriving aircraft accounts for 43% of the 1,170 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 37%Carrier
- 20%National Airspace System
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,170 reported delay minutes here, that single category outweighs weather by 43 to one. The split is drawn from 1,170 delay minutes reported on UA 2149.
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 2.3% 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 909 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 four other city pairs in the data, including LGA to DEN (31), DEN to FCA (31) and EWR to SAN (19), but none flew often enough under UA 2149 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to SMF only.
One caution: this is a thin sample. 308 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 2149
For a booking, UA 2149 has one of the better records a US domestic flight can show: 93.2% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to SMF, every carrier and departure
- SMF to DEN, the return direction
- United Airlines 1208 on the same route81.2%
- United Airlines 2132 on the same route70.6%
- United Airlines 1415 on the same route81.4%
- Denver International (DEN) delay statistics
- Sacramento International (SMF) 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.