Route reliability record
BWI→LAX
Baltimore to Los Angeles
- Flights
- 1,670
- Period
- September 2025 to August 2026
- Distance
- 2,329 mi
- Carriers
- 3
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 1,670 BWI to LAX flights, of which United Airlines flew 578 at 83.2% on time.
Best time to fly BWI to LAX: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 86.5% of the time and Saturday flights 79.4%, against 72.8% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 5 points behind the country as a whole. Across a thousand flights that is about 45 extra late arrivals.
Key figures
On time
72.8%
Arrivals under 15 minutes late, of 1,646 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
1.32%
National rate is 1.89%
Best carrier
United
83.2% on time across 578 flights
These figures cover 1,670 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 83.2% of the time; Southwest Airlines manages 66.3%. Sample sizes sit next to every figure, because a two-point gap across 1,046 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 46 | 91.1% | 31 min | 2.17% | A |
| United Airlines | 578 | 83.2% | 77 min | 0.87% | B+ |
| Southwest Airlines | 1,046 | 66.3% | 50 min | 1.53% | C |
The spread between United and Southwest is 17 points, wide enough that it should decide the booking. On a hundred trips that is 17 more arrivals inside the on-time window.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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. IAD → LAXWashington to Los Angeles | United Airlines | 83.9% | 84.6% | 0.77% | 5am–8am, Mon | UA 1689 12:35 |
| 2. BWI → LAXBaltimore to Los Angeles | United Airlines | 82.5% | 83.2% | 0.87% | 5am–8am, Tue | — |
| 3. DCA → LAXWashington to Los Angeles | American Airlines | 76.3% | 77.3% | 1.24% | 8am–11am, Mon | AA 1966 08:30 |
| 4. BWI → LAXBaltimore to Los Angeles | Southwest Airlines | 65.3% | 66.3% | 1.53% | 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 34 points, against 17 points between the best and worst carrier.
- 5am–8am555 flights86.5%
- 8am–11am205 flights86.1%
- 11am–2pm48 flights72.9%
- 2pm–5pm286 flights58.8%
- 5pm–8pm377 flights66.8%
- 8pm–5am199 flights52.4%
Scale runs 45% to 90%.
The 8pm–5am window is where this operation falls apart: 52.4% on time, against 86.5% for the 5am–8am 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 555 flights scheduled in it.
Explore
Filter BWI to LAX by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On BWI to LAX, the best departure window is 5am–8am at 86.5% on time and the worst is 8pm–5am at 52.4%, a wide gap of 34.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am86.5%
- 8–11am86.1%
- 11am–2pm72.9%
- 2–5pm58.8%
- 5–8pm66.8%
- 8pm–5am52.4%
best all US flightsScale 45% to 95%.
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. September was the busiest month here, with 169 flights.
Across the week, Saturday is the strongest day at 79.4% on time and Sunday the weakest at 66.8%, a spread of 13 points.
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 25,000 reported delay minutes.
- 37%Late-arriving aircraft
- 37%Carrier
- 21%National Airspace System
- 5%Extreme weather
- 1%Security
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 25,000 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 24,877 reported delay minutes.
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 9,115 of the 25,000 delay minutes reported here.
Cancellations sit at 1.32% against a national 1.89%, which is ordinary. Diversions add another 0.12%.
Connections and stage length
What a delay here actually costs
7.2% 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 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 80.8% on time across 1,647 flights, 8 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 8 points of difference.
The sample behind these figures is 1,670 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. 1,646 completed flights over 12 months sit behind that.
Common questions
BWI to LAX questions
How often is BWI to LAX delayed?
Roughly 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 27.2% of the 1,670 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on BWI to LAX?
United Airlines leads at 83.2% on time across 578 flights. Southwest Airlines is at the other end on 66.3%, a gap of 17 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 5am–8am departure window is the strongest at 86.5% on time. The 8pm–5am window is the weakest at 52.4%, 34 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
- United Airlines on BWI to LAX83.2%
- Southwest Airlines on BWI to LAX66.3%
- BWI to ATL, a related route79.9%
- SFO to LAX, a related route70.9%
- BWI to MCO, a related route75.5%
- Spirit Airlines on-time record91.1%
- United Airlines on-time record83.2%
- Southwest Airlines on-time record66.3%
- 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.
Embed BWI to LAX’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.