Route profile
BOS→FLL
Flight reliability, delays and best times to fly from Boston to Fort Lauderdale, 1,237 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 5% of comparable major US routes (4,598 compared)
Calculated from 10,020 flights. How this is calculated
BOS → FLL arrives on time 68.7% of the time; the return trip, FLL → BOS, arrives on time 68.5% of the time.
BOS → FLL spends 28.5 minutes on the ground on a 1,237-mile trip: 20.8 minutes from pushback to wheels-up at BOS and 7.7 minutes from touchdown to gate at FLL.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route's worst arrivals run unusually far past its typical one, a bigger gap than 94% of 4,598 comparable routes.
A typical arrival is 2 min early, but the worst tenth run 75 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,598 in the comparison.
Why BOS → FLL flights are cancelled
July 2023 – July 2026
BOS → FLL cancelled 222 of 10,020 scheduled flights — about 1 in every 45. The reason filed most often was extreme weather, 49.1% of the cancellations coded on this route — about 1 in every 92 scheduled flights.
Share of cancellations
Of 222 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
109 cancellations, 49.1% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
66 cancellations, 29.7% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
47 cancellations, 21.2% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
222 coded cancellations were recorded on BOS → FLL; the section appears from 50.
When it goes wrong
July 2023 – July 2026
73 min late
against a median of 2 min early
BOS → FLL has an average that understates its risk: a typical arrival is 2 min early, but the worst tenth are 75 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 10,020 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at FLL after arriving from BOS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 46% | Likely to miss |
| 45 min | 30% | Likely to miss |
| 60 min | 21% | High risk |
| 90 min | 12% | Some risk |
| 120 min | 8.0% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 2.22% of the time and diverts 0.42% of the time, which a late arrival never shows up in.
Chance of missing is the share of 9,756 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 73 minutes late (90th-percentile gate arrival delay), over 10,020 operations.
Any other layover length: connection checker.
Best time to fly
BOS → FLL flights departing 5–9 AM arrived on time 80.7% of the time, against 49.6% for 9 PM–5 AM departures, a gap of 31.1 percentage points.
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 78.8% on time from 517 flights
- 6 AM: 82.8% on time from 1,515 flights
- 7 AM: 79.3% on time from 1,288 flights
- 8 AM: 79.7% on time from 281 flights
- 9 AM: 63.5% on time from 176 flights
- 10 AM: 70.3% on time from 319 flights
- 11 AM: 71.4% on time from 695 flights
- 12 PM: 67.2% on time from 483 flights
- 1 PM: 60.0% on time from 172 flights
- 2 PM: 68.7% on time from 239 flights
- 3 PM: 64.3% on time from 1,180 flights
- 4 PM: 57.8% on time from 649 flights
- 5 PM: 54.8% on time from 449 flights
- 6 PM: 57.2% on time from 472 flights
- 7 PM: 62.7% on time from 620 flights
- 8 PM: 55.0% on time from 690 flights
- 9 PM: 50.0% on time from 273 flights
- 10 PM to 11 PM: too few flights to score
Why BOS → FLL runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for BOS → FLL. Only delays of 15 minutes or more are attributed.
How this route holds up in bad weather
July 2023 – July 2026
The harder-hit end is the one the flight leaves from, where a cancellation keeps it from departing at all. Bad weather cancels 3.9 times the normal rate at BOS against 2.1 times at FLL. Cancelled in bad weather against normal hours: BOS 5.3% against 1.4%, FLL 3.3% against 1.6%. Flights that did leave FLL in bad weather arrived on time 54.6% of the time, against 73.3% in normal hours.
Bad weather and normal hours at the airports
Scheduled departures, July 2023 – July 2026| Departures from | BOS | FLL |
|---|---|---|
| Cancelled in bad weather | 5.3% | 3.3% |
| Cancelled in normal hours | 1.4% | 1.6% |
| Arrived on time, bad weather | 65.1% | 54.6% |
| Arrived on time, normal hours | 79.7% | 73.3% |
| Departures in bad weather | 60,840 | 13,418 |
Of the carriers on this route, Delta Air Lines (3.1% cancelled against 5.8% for the other carriers at BOS) cancelled the fewest departures from BOS in bad weather and Spirit Airlines (7.8% cancelled against 4.4% for the other carriers at BOS) the most.
This route’s airlines in bad weather at BOS
All departures from BOS| Airline | Bad-weather departures | Cancelled | Other carriers |
|---|---|---|---|
| Delta Air Lines | 10,971 | 3.1%below the others | 5.8% |
| JetBlue | 17,332 | 5.4%about level | 5.1% |
| Spirit Airlines | 2,112 | 7.8%above the others | 4.4% |
These are airport figures, not route figures: every scheduled departure from BOS and FLL, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from BOS on every route.
Weather source and limits. In full: BOS (airlines), FLL, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| JetBlue | 5,247 | 66.2% | 2.12% | -1 min | 13.3% |
| Delta Air Lines | 2,560 | 73.7% | 1.60% | -5 min | 10.3% |
| Spirit Airlines | 2,213 | 69.1% | 3.16% | -2 min | 12.8% |
JetBlue flew 52.4% of the 10,020 flights listed. Spirit Airlines cancelled 3.16% of its flights here against 1.60% for Delta Air Lines.
Delta Air Lines arrived on time 7.5 percentage points more often than JetBlue on this route.
Other ways to fly Boston to Miami
Airport pairs in the same two city markets, as the DOT defines them.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| BOS→MIA Boston to Miami | 11,477 | 78.2% | 1.59% | -9 min | 62 |
| BOS→FLL this route Boston to Fort Lauderdale | 10,020 | 68.7% | 2.22% | -2 min | 40 |
BOS → MIA is the most reliable pairing for this journey at 78.2% on time, against 68.7% for BOS → FLL.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
DL1401 (7:10 AM) arrived on time 80.6% of the time, 20.4 points more often than B6369 (8:30 PM) at 60.2%.
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Sunday the least, a gap of 12.7 percentage points.
By month
- Jan: 63.4%
- Feb: 65.0%
- Mar: 68.0%
- Apr: 75.2%
- May: 72.2%
- Jun: 73.5%
- Jul: 65.4%
- Aug: 65.2%
- Sep: 66.9%
- Oct: 76.1%
- Nov: 76.8%
- Dec: 60.0%
December is historically the weakest month and November the strongest, a spread of 16.8 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 58.6% from 193 flights
- August 2023: 63.8% from 205 flights
- September 2023: 61.5% from 232 flights
- October 2023: 73.2% from 250 flights
- November 2023: 71.5% from 238 flights
- December 2023: 64.2% from 270 flights
- January 2024: 63.5% from 281 flights
- February 2024: 74.9% from 293 flights
- March 2024: 68.1% from 305 flights
- April 2024: 78.1% from 260 flights
- May 2024: 74.8% from 217 flights
- June 2024: 74.1% from 210 flights
- July 2024: 68.1% from 217 flights
- August 2024: 56.3% from 232 flights
- September 2024: 73.2% from 239 flights
- October 2024: 77.9% from 265 flights
- November 2024: 85.3% from 299 flights
- December 2024: 64.0% from 354 flights
- January 2025: 69.1% from 303 flights
- February 2025: 62.0% from 340 flights
- March 2025: 67.8% from 368 flights
- April 2025: 80.3% from 358 flights
- May 2025: 67.7% from 249 flights
- June 2025: 70.0% from 236 flights
- July 2025: 65.1% from 247 flights
- August 2025: 74.9% from 240 flights
- September 2025: 65.6% from 232 flights
- October 2025: 76.9% from 250 flights
- November 2025: 72.1% from 294 flights
- December 2025: 53.1% from 366 flights
- January 2026: 57.2% from 303 flights
- February 2026: 59.2% from 343 flights
- March 2026: 68.0% from 390 flights
- April 2026: 68.3% from 367 flights
- May 2026: 74.8% from 206 flights
- June 2026: 77.6% from 179 flights
- July 2026: 69.7% from 189 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 66.9% against 70.1% in the 12 months before — declining by 3.2 percentage points.
Data and methodology
Calculated by FlyerIntel from 10,020 BOS → FLL flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed