Carrier route record
WNFLL→BWI
Southwest Airlines · Fort Lauderdale to Baltimore
- Flights
- 2,106
- Period
- September 2025 to August 2026
- Share of route
- 67%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Southwest Airlines.
Southwest on FLL to BWI 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 2,106 flights, with a median arrival 1 minute early.
The US average over the same twelve months is 77.3%, so there is little to separate Southwest on FLL to BWI 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 2,054 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
2.18%
National rate is 1.89%
Whole route
71.0%
Every carrier on FLL to BWI, 3,150 flights
These figures cover 2,106 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.
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Carrier by carrier
Southwest against every carrier on FLL to BWI
Southwest flew 2,106 of the 3,150 flights on FLL to BWI, most of the route. Its 73.5% on time is 3 points better than the route as a whole, which runs 71.0%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Southwest at 73.5% to JetBlue at 47.1%. Two 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 |
|---|---|---|---|---|---|
| Southwest Airlines (this page) | 2,106 | 73.5% | 58 min | 2.18% | C |
| Spirit Airlines | 684 | 70.1% | 69 min | 4.68% | C− |
| Frontier Airlinesthin sample | 198 | 66.8% | 88 min | 4.04% | C− |
| JetBlue Airwaysthin sample | 162 | 47.1% | 84 min | 5.56% | F− |
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.
Departure window
When Southwest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 40 points, against half a point between the best and worst carrier.
- 5am–8am406 flights93.0%
- 8am–11am472 flights87.0%
- 11am–2pm325 flights72.4%
- 2pm–5pm345 flights63.1%
- 5pm–8pm411 flights52.9%
- 8pm–5am147 flights59.4%
Scale runs 45% to 100%.
The 5pm–8pm window is where this operation falls apart: 52.9% on time, against 93.0% 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 8am–11am window is the busiest, with 472 flights scheduled in it.
Across the year
Southwest on FLL to BWI through the year
July is the worst month at 61.5% on time, 26 points below September, the best at 87.6%. 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. January was the busiest month here, with 198 flights.
Across the week, Wednesday is the strongest day at 83.4% on time and Sunday the weakest at 61.4%, a spread of 22 points.
Arrival by arrival
How late Southwest on FLL to BWI runs when it is late
The 544 late arrivals split 205 under half an hour, 186 between 30 and 60 minutes, and 153 an hour or more.
- 15+ min early311 flights15.1%
- Within 15 min1,199 flights58.4%
- 15–29 min late205 flights10.0%
- 30–59 min late186 flights9.1%
- 1–2 hours late100 flights4.9%
- 2+ hours late53 flights2.6%
Scale runs 0% to 100%.
Share of 2,054 completed flights by arrival against schedule.
151 of 618 late departures made up the time and arrived on time, 24% of them. 77 flights left on time and still arrived late.
The worst days
Worst days for Southwest on FLL to BWI
The latest arrival of the period was on 2 August 2026, 7 hours 7 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across August, June, March, May and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 August 2026 | 7 hours 7 minutes | National Airspace System |
| 11 June 2026 | 6 hours 27 minutes | Late-arriving aircraft |
| 15 March 2026 | 5 hours 54 minutes | Late-arriving aircraft |
| 10 May 2026 | 5 hours 34 minutes | Carrier |
| 28 July 2026 | 5 hours 12 minutes | National Airspace System |
Delay causes
Why Southwest runs late on this route
Late-arriving aircraft accounts for 47% of the 31,000 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Late-arriving aircraft
- 27%Carrier
- 23%National Airspace System
- 2%Extreme weather
- 0%Security
47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 31,000 reported delay minutes here, that single category outweighs weather by 20 to one. The split is drawn from 31,443 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 93.0% on time here.
Cancellations sit at 2.18% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and stage length
What a delay here costs
7.4% 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 925 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 75.7% on time across 2,124 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 2,106 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.
What to do with this
Booking Southwest on FLL to BWI
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 87.6% on time and July 61.5%, a swing of 26 points. If the dates move at all, move them out of July before you think about anything else. 2,054 completed flights over 12 months sit behind that.
Related
Where to go next
- FLL to BWI, every carrier
- Southwest on BWI to FLL, the return leg
- Spirit Airlines on FLL to BWI70.1%
- Frontier Airlines on FLL to BWI66.8%
- JetBlue Airways on FLL to BWI47.1%
- Southwest Airlines network-wide record
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.