Flight number record
UA 2012
United Airlines · Baltimore to Denver
- Route
- BWI → DEN
- Departs
- 16:23
- Flights
- 306
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2012, check with United Airlines.
UA 2012 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 306 flights, with a median arrival 5 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 305 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
0.33%
National rate is 1.89%
1 hour+ late
6.9%
National rate is 8.3%
These figures cover 306 flights between September 2025 and August 2026. The median arrival is 5 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 2012 flies
UA 2012 flies BWI to DEN without a single fixed slot. Its most common scheduled departure was 16:23, used on 81 of 306 flights, with 16:10 (40 flights) and 16:21 (34 flights) next.
- Departs 16:2381 flights26.5%
- Departs 16:1040 flights13.1%
- Departs 16:2134 flights11.1%
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 16:23 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2012 runs 7 points better at 78.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 2012 next to BWI to DEN
Every carrier on BWI to DEN combined arrived on time 76.0% of the time across 2,784 flights, so UA 2012 is 3 points ahead of it. United flew 840 flights on the same city pair under all its flight numbers, including this one, and those ran 84.5% on time. Across its whole network United Airlines managed 78.8%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2012thin sample | 306 | 78.7% | 69 min | 0.33% | B+ |
| All United Airlines on BWI–DEN | 840 | 84.5% | 61 min | 0.48% | B+ |
| All carriers on BWI–DEN | 2,784 | 76.0% | 52 min | 1.40% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2012 quarter by quarter
UA 2012 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 70.0%, a swing of 13 points on roughly 61 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 202555 flights81.8%
- Jan–Mar 202690 flights77.5%
- Apr–Jun 202691 flights80.2%
- Jul–Sep 202640 flights70.0%
Scale runs 60% to 90%.
By weekday, UA 2012 did best on Tuesday at 88.6% on time and worst on Monday at 70.5%. Each day rests on about 44 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2012 runs when it is late
UA 2012 often beats the schedule: 82 of 305 completed flights, 27%, arrived 15 minutes or more early. The 65 late arrivals split 23 under half an hour, 21 between 30 and 60 minutes, and 21 an hour or more.
- 15+ min early82 flights26.9%
- Within 15 min158 flights51.8%
- 15–29 min late23 flights7.5%
- 30–59 min late21 flights6.9%
- 1–2 hours late10 flights3.3%
- 2+ hours late11 flights3.6%
Scale runs 0% to 100%.
Share of 305 completed flights by arrival against schedule.
8 of 46 late departures made up the time and arrived on time, 17% of them. In the other direction, 27 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for UA 2012
The latest arrival of the period was on 4 June 2026, 5 hours 59 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 June 2026 | 5 hours 59 minutes | Late-arriving aircraft |
| 18 July 2026 | 5 hours 51 minutes | Late-arriving aircraft |
| 6 March 2026 | 4 hours 25 minutes | Late-arriving aircraft |
| 28 July 2026 | 3 hours 25 minutes | National Airspace System |
| 17 April 2026 | 2 hours 52 minutes | Late-arriving aircraft |
Delay causes
Why UA 2012 runs late
National Airspace System accounts for 50% of the 4,491 delay minutes carriers reported here, and the remaining four split what is left.
- 50%National Airspace System
- 36%Late-arriving aircraft
- 7%Carrier
- 7%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,491 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 4,491 delay minutes reported on UA 2012.
Cancellations are rare at 0.33%, 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
6.9% 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 1,491 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 two other city pairs in the data, including ONT to SFO (37) and OMA to ORD (7), but none flew often enough under UA 2012 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BWI to DEN only.
One caution: this is a thin sample. 306 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 2012
For a booking, read UA 2012 as 78.7% on time with 0.33% cancelled over 306 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BWI to DEN, every carrier and departure
- DEN to BWI, the return direction
- United Airlines 2412 on the same route88.0%
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Denver International (DEN) 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.