Carrier route record
F9BWI→FLL
Frontier Airlines · Baltimore to Fort Lauderdale
- Flights
- 135
- Period
- July 2025 to June 2026
- Share of route
- 4%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on BWI to FLL draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 135 flights. The strongest carrier on the route with a full sample, Spirit Airlines, flew 847 at 78.5% on time.
The national on-time rate over the same period is 77.6%, so Frontier on BWI to FLL runs 16 points behind the country as a whole. Across a thousand flights that is about 160 extra late arrivals.
Key figures
On time
61.6%
Arrivals under 15 minutes late, of 125 completed flights
Avg delay
87 min
Across delayed arrivals only, not all flights
Cancelled
7.41%
National rate is 1.81%
Whole route
76.0%
Every carrier on BWI to FLL, 3,108 flights
These figures cover 135 flights between July 2025 and June 2026. Beyond the headline rate, 20.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Frontier against every carrier on BWI to FLL
Frontier flew 135 of the 3,108 flights on BWI to FLL, about 4% of it. Its 61.6% on time is 14 points worse than the route as a whole, which runs 76.0%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Spirit at 78.5% to Frontier at 61.6%.
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 |
|---|---|---|---|---|---|
| Spirit Airlines | 847 | 78.5% | 68 min | 3.90% | B− |
| Southwest Airlines | 2,126 | 75.9% | 57 min | 1.51% | B |
| Frontier Airlines (this page)thin sample | 135 | 61.6% | 87 min | 7.41% | D− |
Spirit Airlines cancels 3.9% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 points, against 3 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am5 flights—
- 8am–11am4 flights—
- 11am–2pm41 flights73.7%
- 2pm–5pm8 flights—
- 5pm–8pm25 flights—
- 8pm–5am52 flights61.2%
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 61.2% on time, against 73.7% for the 11am–2pm 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 8pm–5am window is the busiest, with 52 flights scheduled in it.
Across the year
Frontier on BWI to FLL through the year
- Oct–Dec 202515 flights—
- Jan–Mar 202640 flights41.7%
- Apr–Jun 202680 flights73.3%
Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 61.6% on time across 135 flights.
Split by quarter, Frontier on BWI to FLL logged 15 flights in Oct–Dec 2025, 40 flights in Jan–Mar 2026 and 80 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 61.6% annual figure is the one to use.
Delay causes
Why Frontier runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 67% of the 4,167 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 67%Late-arriving aircraft
- 17%Carrier
- 16%National Airspace System
- 0%Extreme weather
67% 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 4,167 reported delay minutes here, that single category outweighs weather by 67 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 4,167 reported delay minutes.
Cancellations run at 7.41%, against 1.81% nationally. That is roughly one flight in twelve cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 20.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 71.1% on time across 136 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.
One caution: this is a thin sample. 135 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Frontier on BWI to FLL
Put together: the delay figures matter less here than the 7.41% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 125 completed flights over 12 months sit behind that.
Related
Where to go next
- BWI to FLL, every carrier
- Frontier on FLL to BWI, the return leg
- Spirit Airlines on BWI to FLL78.5%
- Southwest Airlines on BWI to FLL75.9%
- Frontier Airlines network-wide record
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.