Route reliability record
MIA→BWI
Miami to Baltimore
- Flights
- 2,291
- Period
- September 2025 to August 2026
- Distance
- 946 mi
- Carriers
- 5
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, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 2,291 MIA to BWI flights, of which Southwest Airlines flew 1,188 at 73.6% on time.
Best time to fly MIA to BWI: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 94.1% of the time and Tuesday flights 82.7%, against 73.5% 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
73.5%
Arrivals under 15 minutes late, of 2,224 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
2.14%
National rate is 1.89%
Best carrier
Southwest
73.6% on time across 1,188 flights
These figures cover 2,291 flights between September 2025 and August 2026. Beyond the headline rate, 8.4% 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 MIA to BWI
The two carriers here are closely matched: 3 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 121 | 90.9% | 49 min | 0.00% | A+ |
| Southwest Airlines | 1,188 | 73.6% | 54 min | 2.10% | C |
| Frontier Airlinesthin sample | 269 | 72.2% | 84 min | 3.35% | C− |
| Spirit Airlinesthin sample | 15 | 71.4% | 149 min | 6.67% | C− |
| American Airlines | 698 | 70.8% | 66 min | 2.01% | C |
No carrier stands out. Southwest tops the table at 73.6%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
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Best ways to make this trip
The most reliable ways to fly Miami to Baltimore
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. 3 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. FLL → IADFort Lauderdale to Washington | United Airlines | 85.4% | 85.9% | 0.57% | 8am–11am, Tue | — |
| 2. MIA → DCAMiami to Washington | American Airlines | 74.0% | 75.7% | 2.22% | 5am–8am, Tue | AA 2648 19:17 |
| 3. MIA → BWIMiami to Baltimore | Southwest Airlines | 72.1% | 73.6% | 2.10% | 5am–8am, Tue | — |
| 4. FLL → BWIFort Lauderdale to Baltimore | Southwest Airlines | 71.9% | 73.5% | 2.18% | 5am–8am, Wed | — |
| 5. MIA → BWIMiami to Baltimore | American Airlines | 69.4% | 70.8% | 2.01% | 5am–8am, Tue | — |
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 40 points, against 3 points between the best and worst carrier.
- 5am–8am475 flights94.1%
- 8am–11am140 flights88.4%
- 11am–2pm316 flights75.5%
- 2pm–5pm638 flights70.1%
- 5pm–8pm341 flights54.1%
- 8pm–5am381 flights63.5%
Scale runs 45% to 100%.
The 5pm–8pm window is where this operation falls apart: 54.1% on time, against 94.1% 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 2pm–5pm window is the busiest, with 638 flights scheduled in it.
Explore
Filter MIA to BWI 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 MIA to BWI, the best departure window is 5am–8am at 94.1% on time and the worst is 5pm–8pm at 54.1%, a wide gap of 40.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am94.1%
- 8–11am88.4%
- 11am–2pm75.5%
- 2–5pm70.1%
- 5–8pm54.1%
- 8pm–5am63.5%
best all US flightsScale 45% to 100%.
Across the year
When delays peak on this route
This route's year swings by 32 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 51.7% on time, 32 points below January, the best at 83.8%. 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. December was the busiest month here, with 218 flights.
Across the week, Tuesday is the strongest day at 82.7% on time and Sunday the weakest at 65.1%, a spread of 18 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 44% of the 37,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 30%Carrier
- 23%National Airspace System
- 4%Extreme weather
- 0%Security
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 37,000 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 36,650 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 94.1% on time here.
Cancellations sit at 2.14% against a national 1.89%, which is ordinary. Diversions add another 0.79%.
Connections and stage length
What a delay here actually costs
8.4% 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.
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 75.3% on time across 2,294 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 2,291 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 BWI 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. January runs 83.8% on time and July 51.7%, a swing of 32 points. If the dates move at all, move them out of July before you think about anything else. 2,224 completed flights over 12 months sit behind that.
Common questions
MIA to BWI questions
How often is MIA to BWI 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 26.5% of the 2,291 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on MIA to BWI?
Southwest Airlines leads at 73.6% on time across 1,188 flights. American Airlines is at the other end on 70.8%, a gap of 3 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 MIA to BWI?
The 5am–8am departure window is the strongest at 94.1% on time. The 5pm–8pm window is the weakest at 54.1%, 40 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 MIA to BWI?
July is the weakest month at 51.7% on time, compared with 83.8% in January. Across the year that is 32 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
- BWI to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Envoy Air on MIA to BWI90.9%
- Southwest Airlines on MIA to BWI73.6%
- Frontier Airlines on MIA to BWI72.2%
- American Airlines on MIA to BWI70.8%
- MIA to ATL, a related route74.2%
- ATL to BWI, a related route75.2%
- MIA to LGA, a related route67.4%
- Envoy Air on-time record90.9%
- Southwest Airlines on-time record73.6%
- Frontier Airlines on-time record72.2%
- 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. MIA to BWI and BWI to MIA 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.