Carrier route record
UADEN→BWI
United Airlines · Denver to Baltimore
- Flights
- 839
- Period
- September 2025 to August 2026
- Share of route
- 30%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on DEN to BWI lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 839 flights, with a median arrival 5 minutes early.
Set against the rest of the country, United's DEN to BWI record is 5 points better than the US average of 77.3%. That gap is worth roughly 49 fewer late arrivals for every thousand flights.
Key figures
On time
82.2%
Arrivals under 15 minutes late, of 830 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.60%
National rate is 1.89%
Whole route
77.3%
Every carrier on DEN to BWI, 2,781 flights
These figures cover 839 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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Carrier by carrier
United against every carrier on DEN to BWI
United flew 839 of the 2,781 flights on DEN to BWI, about 30% of it. Its 82.2% on time is 5 points better than the route as a whole, which runs 77.3%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Frontier at 92.0% to Southwest at 74.9%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 25 | 92.0% | 82 min | 0.00% | A+ |
| United Airlines (this page) | 839 | 82.2% | 51 min | 0.60% | B+ |
| Southwest Airlines | 1,917 | 74.9% | 51 min | 1.15% | C |
Flight by flight
United flight numbers on DEN to BWI
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Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 16 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am365 flights88.7%
- 11am–2pm25 flights—
- 2pm–5pm87 flights87.2%
- 5pm–8pm344 flights72.6%
- 8pm–5am18 flights—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 88.7% of the time, against 72.6% for the evening window. That is 16 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 365 flights scheduled in it.
Across the year
United on DEN to BWI through the year
July is the worst month at 67.8% on time, 26 points below October, the best at 93.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. October was the busiest month here, with 93 flights.
Across the week, Wednesday is the strongest day at 86.6% on time and Sunday the weakest at 72.0%, a spread of 15 points.
Arrival by arrival
How late United on DEN to BWI runs when it is late
The 148 late arrivals split 62 under half an hour, 49 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early202 flights24.3%
- Within 15 min480 flights57.8%
- 15–29 min late62 flights7.5%
- 30–59 min late49 flights5.9%
- 1–2 hours late27 flights3.3%
- 2+ hours late10 flights1.2%
Scale runs 0% to 100%.
Share of 830 completed flights by arrival against schedule.
30 of 127 late departures made up the time and arrived on time, 24% of them. In the other direction, 51 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 BWI.
The worst days
Worst days for United on DEN to BWI
The latest arrival of the period was on 31 May 2026, 5 hours 55 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 |
|---|---|---|
| 31 May 2026 | 5 hours 55 minutes | Late-arriving aircraft |
| 13 March 2026 | 4 hours 40 minutes | Late-arriving aircraft |
| 17 February 2026 | 3 hours 13 minutes | Late-arriving aircraft |
| 6 March 2026 | 2 hours 49 minutes | National Airspace System |
| 17 April 2026 | 2 hours 40 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 43% of the 7,492 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 29%Carrier
- 27%National Airspace System
- 2%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,492 reported delay minutes here, that single category outweighs weather by 24 to one. The split is drawn from 7,492 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 88.7% on time here.
Cancellations are rare at 0.60%, 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 stage length
What a delay here costs
Badly late arrivals are rare here: only 4.5% 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 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 return leg runs 84.5% on time across 840 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 839 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 United on DEN to BWI
Put together: treat all of this as provisional. 839 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 82.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 830 completed flights over 12 months sit behind that.
Related
Where to go next
- DEN to BWI, every carrier
- United on BWI to DEN, the return leg
- Southwest Airlines on DEN to BWI74.9%
- United Airlines network-wide record
- Denver International (DEN) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.