Route reliability record
BWI→MIA
Baltimore to Miami
- Flights
- 2,294
- Period
- September 2025 to August 2026
- Distance
- 946 mi
- Carriers
- 5
This route sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 2,294 BWI to MIA flights, of which American Airlines flew 699 at 80.6% on time.
Best time to fly BWI to MIA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 90.3% of the time and Tuesday flights 81.8%, against 75.3% for the route overall.
The US average over the same twelve months is 77.3%, 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
75.3%
Arrivals under 15 minutes late, of 2,227 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
2.44%
National rate is 1.89%
Best carrier
American
80.6% on time across 699 flights
These figures cover 2,294 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on BWI to MIA
The choice of carrier is not cosmetic here. American Airlines arrives on time 80.6% of the time; Southwest Airlines manages 72.6%. Sample sizes sit next to every figure, because a two-point gap across 1,189 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 121 | 81.8% | 64 min | 0.00% | B+ |
| American Airlines | 699 | 80.6% | 117 min | 2.29% | B |
| Southwest Airlines | 1,189 | 72.6% | 53 min | 2.27% | C |
| Frontier Airlinesthin sample | 269 | 71.1% | 87 min | 4.46% | C− |
| Spirit Airlinesthin sample | 16 | 60.0% | 46 min | 6.25% | D− |
American leads Southwest by 8 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on BWI to MIA
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Baltimore to Miami
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. 4 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. IAD → FLLWashington to Fort Lauderdale | United Airlines | 83.0% | 83.5% | 0.57% | 8am–11am, Wed | UA 1825 08:15 |
| 2. BWI → MIABaltimore to Miami | American Airlines | 78.8% | 80.6% | 2.29% | 5am–8am, Thu | AA 1183 06:00 |
| 3. DCA → MIAWashington to Miami | American Airlines | 75.9% | 77.7% | 2.28% | 5am–8am, Tue | — |
| 4. BWI → FLLBaltimore to Fort Lauderdale | Southwest Airlines | 74.4% | 75.7% | 1.69% | 5am–8am, Tue | — |
| 5. BWI → FLLBaltimore to Fort Lauderdale | Spirit Airlines | 74.4% | 78.0% | 4.66% | 5am–8am, Wed | — |
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 31 points, against 8 points between the best and worst carrier.
- 5am–8am429 flights90.3%
- 8am–11am462 flights81.1%
- 11am–2pm384 flights79.1%
- 2pm–5pm151 flights62.1%
- 5pm–8pm659 flights66.9%
- 8pm–5am209 flights59.8%
Scale runs 50% to 95%.
The 8pm–5am window is where this operation falls apart: 59.8% on time, against 90.3% 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 5pm–8pm window is the busiest, with 659 flights scheduled in it.
Explore
Filter BWI to MIA 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 MIA, the best departure window is 5am–8am at 90.3% on time and the worst is 8pm–5am at 59.8%, a wide gap of 30.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.3%
- 8–11am81.1%
- 11am–2pm79.1%
- 2–5pm62.1%
- 5–8pm66.9%
- 8pm–5am59.8%
best all US flightsScale 50% to 95%.
Across the year
When delays peak on this route
This route's year swings by 25 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.
July is the worst month at 65.0% on time, 25 points below September, the best at 90.2%. 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. December was the busiest month here, with 218 flights.
Across the week, Tuesday is the strongest day at 81.8% on time and Sunday the weakest at 68.1%, a spread of 14 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 43% of the 40,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 31%Carrier
- 20%National Airspace System
- 6%Extreme weather
- 0%Security
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 40,000 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 40,198 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.3% on time here.
Cancellations sit at 2.44% against a national 1.89%, which is ordinary. Diversions add another 0.48%.
Connections and stage length
What a delay here actually costs
8.0% 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 946 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 73.5% on time across 2,291 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.
The sample behind these figures is 2,294 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 MIA 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. September runs 90.2% on time and July 65.0%, a swing of 25 points. If the dates move at all, move them out of July before you think about anything else. 2,227 completed flights over 12 months sit behind that.
Common questions
BWI to MIA questions
How often is BWI to MIA 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 24.7% of the 2,294 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on BWI to MIA?
American Airlines leads at 80.6% on time across 699 flights. Southwest Airlines is at the other end on 72.6%, a gap of 8 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 MIA?
The 5am–8am departure window is the strongest at 90.3% on time. The 8pm–5am window is the weakest at 59.8%, 31 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 July delays on BWI to MIA?
July is the weakest month at 65.0% on time, compared with 90.2% in September. Across the year that is 25 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
- MIA to BWI — the return legseparate record
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Miami International (MIA) delay statistics
- Envoy Air on BWI to MIA81.8%
- American Airlines on BWI to MIA80.6%
- Southwest Airlines on BWI to MIA72.6%
- Frontier Airlines on BWI to MIA71.1%
- BWI to ATL, a related route79.9%
- ATL to MIA, a related route71.2%
- BWI to MCO, a related route75.5%
- Envoy Air on-time record81.8%
- American Airlines on-time record80.6%
- Southwest Airlines on-time record72.6%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. BWI to MIA and MIA 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.