Route reliability record
BOS→FLL
Boston to Fort Lauderdale
- Flights
- 3,306
- Period
- September 2025 to August 2026
- Distance
- 1,237 mi
- Carriers
- 3
This route carries a cancellation problem, not just a delay problem: 3.8% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about two flights in three arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 3,306 BOS to FLL flights, of which Delta Air Lines flew 887 at 69.8% on time.
Best time to fly BOS to FLL: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 80.0% of the time and Wednesday flights 76.5%, against 66.8% for the route overall.
Delta Air Lines is the most reliable of the three carriers covered here at 69.8% on time across 887 flights.
Key figures
On time
66.8%
Arrivals under 15 minutes late, of 3,167 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
3.78%
National rate is 1.89%
Best carrier
Delta
69.8% on time across 887 flights
These figures cover 3,306 flights between September 2025 and August 2026. Beyond the headline rate, 13.5% 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 BOS to FLL
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 69.8% of the time; Spirit Airlines manages 62.1%. Sample sizes sit next to every figure, because a two-point gap across 448 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 887 | 69.8% | 76 min | 3.04% | C− |
| JetBlue Airways | 1,971 | 66.4% | 68 min | 3.50% | C− |
| Spirit Airlines | 448 | 62.1% | 82 min | 6.47% | D− |
Spirit Airlines cancels 6.5% 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.
Flight by flight
Flights on BOS to FLL
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 Boston to Fort Lauderdale
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. BOS → MIABoston to Miami | American Airlines | 80.9% | 82.3% | 1.72% | 5am–8am, Wed | AA 2980 06:00 |
| 2. BOS → MIABoston to Miami | Delta Air Lines | 70.5% | 72.4% | 2.58% | 5am–8am, Wed | DL 1399 07:05 |
| 3. BOS → FLLBoston to Fort Lauderdale | Delta Air Lines | 67.7% | 69.8% | 3.04% | 8am–11am, Wed | DL 1401 07:10 |
| 4. BOS → PBIBoston to West Palm Beach | Delta Air Lines | 67.0% | 69.0% | 2.85% | 8am–11am, Tue | DL 2160 15:35 |
| 5. BOS → FLLBoston to Fort Lauderdale | JetBlue Airways | 64.1% | 66.4% | 3.50% | 5am–8am, Wed | B6 569 06:00 |
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 28 points, against 8 points between the best and worst carrier.
- 5am–8am961 flights80.0%
- 8am–11am523 flights76.9%
- 11am–2pm308 flights60.4%
- 2pm–5pm642 flights59.7%
- 5pm–8pm572 flights51.7%
- 8pm–5am300 flights57.2%
Scale runs 45% to 85%.
The 5pm–8pm window is where this operation falls apart: 51.7% on time, against 80.0% 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 5am–8am window is the busiest, with 961 flights scheduled in it.
Explore
Filter BOS to FLL 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 BOS to FLL, the best departure window is 5am–8am at 80.0% on time and the worst is 5pm–8pm at 51.7%, a wide gap of 28.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am80.0%
- 8–11am76.9%
- 11am–2pm60.4%
- 2–5pm59.7%
- 5–8pm51.7%
- 8pm–5am57.2%
best all US flightsScale 45% to 95%.
Across the year
When delays peak on this route
This route's year swings by 24 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.
December is the weak month at 53.1% on time, against 77.6% in June. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. March was the busiest month here, with 390 flights.
Across the week, Wednesday is the strongest day at 76.5% on time and Sunday the weakest at 57.1%, a spread of 19 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 76,000 reported delay minutes.
- 38%Late-arriving aircraft
- 32%National Airspace System
- 29%Carrier
- 1%Extreme weather
- 0%Security
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 76,000 reported delay minutes here, that single category outweighs weather by 26 to one. The split is drawn from 75,916 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 80.0% on time here.
Cancellations run at 3.78%, against 1.89% nationally. That is about one flight in 25 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 actually costs
13.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,237 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 66.8% on time across 3,293 flights, within half a point 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 3,306 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 FLL after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.78% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 3,167 completed flights over 12 months sit behind that.
Common questions
BOS to FLL questions
How often is BOS to FLL delayed?
About one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 33.2% of the 3,306 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 BOS to FLL?
Delta Air Lines leads at 69.8% on time across 887 flights. Spirit Airlines is at the other end on 62.1%, 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 BOS to FLL?
The 5am–8am departure window is the strongest at 80.0% on time. The 5pm–8pm window is the weakest at 51.7%, 28 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 December delays on BOS to FLL?
December is the weakest month at 53.1% on time, compared with 77.6% in June. Across the year that is 24 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
- FLL to BOS — the return legseparate record
- Boston Logan International (BOS) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Delta Air Lines on BOS to FLL69.8%
- JetBlue Airways on BOS to FLL66.4%
- Spirit Airlines on BOS to FLL62.1%
- BOS to DCA, a related route72.6%
- ATL to FLL, a related route70.7%
- BOS to ORD, a related route71.9%
- Delta Air Lines on-time record69.8%
- JetBlue Airways on-time record66.4%
- Spirit Airlines on-time record62.1%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. BOS to FLL and FLL to BOS 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.