Carrier route record
UALAX→BWI
United Airlines · Los Angeles to Baltimore
- Flights
- 577
- Period
- September 2025 to August 2026
- Share of route
- 35%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on LAX to BWI earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 577 flights, with a median arrival 12 minutes early.
Set against the rest of the country, United's LAX to BWI record is 12 points better than the US average of 77.3%. That gap is worth roughly 118 fewer late arrivals for every thousand flights.
Key figures
On time
89.1%
Arrivals under 15 minutes late, of 571 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.35%
National rate is 1.89%
Whole route
80.8%
Every carrier on LAX to BWI, 1,647 flights
These figures cover 577 flights between September 2025 and August 2026. The median arrival is 12 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 LAX to BWI
United flew 577 of the 1,647 flights on LAX to BWI, about 35% of it. Its 89.1% on time is 8 points better than the route as a whole, which runs 80.8%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from United at 89.1% to Southwest at 76.2%. 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 |
|---|---|---|---|---|---|
| United Airlines (this page) | 577 | 89.1% | 63 min | 0.35% | A+ |
| Spirit Airlinesthin sample | 48 | 77.1% | 39 min | 0.00% | B+ |
| Southwest Airlines | 1,022 | 76.2% | 38 min | 1.08% | B |
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Departure window
When United runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 577 flights.
- 5am–8am—
- 8am–11am278 flights87.2%
- 11am–2pm62 flights95.0%
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am237 flights89.9%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 95.0% on time, ahead of 8am–11am at 87.2%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 8am–11am window is the busiest, with 278 flights scheduled in it.
Across the year
United on LAX to BWI through the year
July is the worst month at 78.2% on time, 20 points below April, the best at 98.0%. 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 60 flights.
Across the week, Monday is the strongest day at 94.5% on time and Thursday the weakest at 82.8%, a spread of 12 points.
Arrival by arrival
How late United on LAX to BWI runs when it is late
United on LAX to BWI often beats the schedule: 255 of 571 completed flights, 45%, arrived 15 minutes or more early. The 62 late arrivals split 25 under half an hour, 19 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early255 flights44.7%
- Within 15 min254 flights44.5%
- 15–29 min late25 flights4.4%
- 30–59 min late19 flights3.3%
- 1–2 hours late14 flights2.5%
- 2+ hours late4 flights0.7%
Scale runs 0% to 100%.
Share of 571 completed flights by arrival against schedule.
19 of 64 late departures made up the time and arrived on time, 30% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for United on LAX to BWI
The latest arrival of the period was on 11 June 2026, 10 hours 53 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across June, September, July and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 June 2026 | 10 hours 53 minutes | Carrier |
| 16 September 2025 | 6 hours 54 minutes | National Airspace System |
| 13 July 2026 | 3 hours 16 minutes | Carrier |
| 28 November 2025 | 2 hours 35 minutes | Late-arriving aircraft |
| 2 September 2025 | 1 hour 58 minutes | National Airspace System |
Delay causes
Why United runs late on this route
Carrier accounts for 47% of the 3,903 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 28%Late-arriving aircraft
- 24%National Airspace System
The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,838 of the 3,903 delay minutes reported here. The split is drawn from 3,903 reported delay minutes.
Cancellations are rare at 0.35%, 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 3.2% 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.
At 2,329 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 83.2% on time across 578 flights, 6 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
One caution: this is a thin sample. 577 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 LAX to BWI
Put together: treat all of this as provisional. 577 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 89.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 571 completed flights over 12 months sit behind that.
Related
Where to go next
- LAX to BWI, every carrier
- United on BWI to LAX, the return leg
- Southwest Airlines on LAX to BWI76.2%
- United Airlines network-wide record
- Los Angeles International (LAX) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Worst months to fly in the US, ranked by the data
- The best day of the week to fly, and why it is the second lever
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.