Route reliability record
BWI→LAX
Baltimore to Los Angeles
- Flights
- 1,727
- Period
- July 2025 to June 2026
- Distance
- 2,329 mi
- Carriers
- 3
This route sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 1,727 BWI to LAX flights, of which United Airlines flew 576 at 85.0% on time.
Best time to fly BWI to LAX: a 8am–11am departure, ideally on a Saturday. Flights in that window arrived on time 89.0% of the time and Saturday flights 81.9%, against 74.4% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
74.4%
Arrivals under 15 minutes late, of 1,703 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
1.27%
National rate is 1.81%
Best carrier
United
85.0% on time across 576 flights
These figures cover 1,727 flights between July 2025 and June 2026. The median arrival is 3 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.
Carrier by carrier
Which airline is most reliable on BWI to LAX
The choice of carrier is not cosmetic here. United Airlines arrives on time 85.0% of the time; Southwest Airlines manages 67.2%. Sample sizes sit next to every figure, because a two-point gap across 1,045 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 106 | 87.5% | 104 min | 1.89% | A |
| United Airlines | 576 | 85.0% | 89 min | 1.22% | A |
| Southwest Airlines | 1,045 | 67.2% | 49 min | 1.24% | C |
The spread between United and Southwest is 18 points, wide enough that it should decide the booking. On a hundred trips that is 18 more arrivals inside the on-time window.
Best ways to make this trip
The most reliable ways to fly Baltimore to Los Angeles
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. BWI → LAXBaltimore to Los Angeles | United Airlines | 84.0% | 85.0% | 1.22% | 5am–8am, Tue | — |
| 2. IAD → LAXWashington to Los Angeles | United Airlines | 82.3% | 83.1% | 0.99% | 11am–2pm, Fri (route) | UA 1689 12:35 |
| 3. DCA → LAXWashington to Los Angeles | American Airlines | 76.8% | 77.8% | 1.23% | 8am–11am, Mon | AA 1966 08:20 |
| 4. BWI → LAXBaltimore to Los Angeles | Southwest Airlines | 66.4% | 67.2% | 1.24% | 8am–11am, Sat | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 37 points, against 18 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am588 flights88.1%
- 8am–11am186 flights89.0%
- 11am–2pm53 flights73.6%
- 2pm–5pm284 flights60.3%
- 5pm–8pm400 flights69.7%
- 8pm–5am216 flights52.1%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 52.1% on time, against 89.0% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 588 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 33 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
June is the worst month at 50.3% on time, 33 points below November, the best at 82.8%. 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. July was the busiest month here, with 176 flights.
Across the week, Saturday is the strongest day at 81.9% on time and Sunday the weakest at 69.6%. 12 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 26,000 reported delay minutes.
- 40%Late-arriving aircraft
- 34%Carrier
- 20%National Airspace System
- 5%Extreme weather
- 1%Security
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 26,000 reported delay minutes here, that single category outweighs weather by 9 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 25,508 reported delay minutes.
The largest share of delay minutes, 34%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 8,721 of the 26,000 delay minutes reported here.
Cancellations sit at 1.27% against a national 1.81%, which is ordinary. Diversions add another 0.12%.
Connections and stage length
What a delay here actually costs
7.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 1,722 flights, 9 points above 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 9 points of difference.
The sample behind these figures is 1,727 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in LAX after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. November runs 82.8% on time and June 50.3%, a swing of 33 points. If the dates move at all, move them out of June before you think about anything else. 1,703 completed flights over 12 months sit behind that.
Common questions
BWI to LAX questions
How often is BWI to LAX delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.6% of the 1,727 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on BWI to LAX?
United Airlines leads at 85.0% on time across 576 flights. Southwest Airlines is at the other end on 67.2%, a gap of 18 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on BWI to LAX?
The 8am–11am departure window is the strongest at 89.0% on time. The 8pm–5am window is the weakest at 52.1%, 37 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are June delays on BWI to LAX?
June is the weakest month at 50.3% on time, compared with 82.8% in November. Across the year that is 33 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- LAX to BWI — the return legseparate record
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Los Angeles International (LAX) delay statistics
- Spirit Airlines on BWI to LAX87.5%
- United Airlines on BWI to LAX85.0%
- Southwest Airlines on BWI to LAX67.2%
- BWI to ATL, a related route80.6%
- SFO to LAX, a related route73.9%
- BWI to MCO, a related route75.6%
- Spirit Airlines on-time record87.5%
- United Airlines on-time record85.0%
- Southwest Airlines on-time record67.2%
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
Direction matters. BWI to LAX and LAX to BWI are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.