Route profile
FLL→BOS
Flight reliability, delays and best times to fly from Fort Lauderdale to Boston, 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 4% of comparable major US routes (4,598 compared)
Calculated from 9,992 flights. How this is calculated
FLL → BOS arrives on time 68.5% of the time; the return trip, BOS → FLL, arrives on time 68.7% of the time.
FLL → BOS spends 26.8 minutes on the ground on a 1,237-mile trip: 17.9 minutes from pushback to wheels-up at FLL and 8.8 minutes from touchdown to gate at BOS.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
On-time performance swings unusually widely by time of day here, wider than 99% of 4,023 comparable routes.
87.1% on time for 5–9 AM departures, against 46.0% for 9 PM–5 AM.
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 4,023 in the comparison.
Why FLL → BOS flights are cancelled
July 2023 – July 2026
FLL → BOS cancelled 211 of 9,992 scheduled flights — about 1 in every 47. The reason filed most often was extreme weather, 47.9% of the cancellations coded on this route — about 1 in every 99 scheduled flights.
Share of cancellations
Of 211 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.
101 cancellations, 47.9% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
64 cancellations, 30.3% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
46 cancellations, 21.8% 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.
211 coded cancellations were recorded on FLL → BOS; the section appears from 50.
When it goes wrong
July 2023 – July 2026
76 min late
against a median of 2 min early
FLL → BOS has an average that understates its risk: a typical arrival is 2 min early, but the worst tenth are 78 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 9,992 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at BOS after arriving from FLL.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 47% | Likely to miss |
| 45 min | 31% | Likely to miss |
| 60 min | 22% | High risk |
| 90 min | 13% | Some risk |
| 120 min | 7.7% | 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 2.11% of the time and diverts 0.16% of the time, which a late arrival never shows up in.
Chance of missing is the share of 9,765 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 76 minutes late (90th-percentile gate arrival delay), over 9,992 operations.
Any other layover length: connection checker.
Best time to fly
FLL → BOS flights departing 5–9 AM arrived on time 87.1% of the time, against 46.0% for 9 PM–5 AM departures, a gap of 41.1 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 91.3% on time from 671 flights
- 7 AM: 84.4% on time from 959 flights
- 8 AM: 86.5% on time from 630 flights
- 9 AM: 78.1% on time from 188 flights
- 10 AM: 79.2% on time from 445 flights
- 11 AM: 73.4% on time from 1,097 flights
- 12 PM: 64.0% on time from 569 flights
- 1 PM: 61.0% on time from 365 flights
- 2 PM: 65.5% on time from 348 flights
- 3 PM: 56.2% on time from 275 flights
- 4 PM: 55.0% on time from 549 flights
- 5 PM: 52.1% on time from 558 flights
- 6 PM: 59.7% on time from 288 flights
- 7 PM: 59.8% on time from 707 flights
- 8 PM: 63.3% on time from 1,887 flights
- 9 PM: 44.5% on time from 421 flights
- 10 PM to 11 PM: too few flights to score
Why FLL → BOS runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
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 FLL → BOS. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on FLL → BOS, at 36.7%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 87.1% of the time and 9 PM–5 AM departures 46.0%.
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 | 5,223 | 67.7% | 2.09% | -1 min | 14.6% |
| Delta Air Lines | 2,559 | 73.7% | 1.76% | -5 min | 10.7% |
| Spirit Airlines | 2,210 | 64.4% | 2.58% | 2 min | 14.4% |
JetBlue flew 52.3% of the 9,992 flights listed.
Delta Air Lines arrived on time 9.3 percentage points more often than Spirit Airlines on this route.
Other ways to fly Miami to Boston
Airport pairs in the same two city markets, as the DOT defines them.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| MIA→BOS Miami to Boston | 11,478 | 70.3% | 1.73% | -3 min | 45 |
| FLL→BOS this route Fort Lauderdale to Boston | 9,992 | 68.5% | 2.11% | -2 min | 39 |
MIA → BOS is the most reliable pairing for this journey at 70.3% on time, against 68.5% for FLL → BOS.
Flying to BOS from the Miami area? Compare FLL, MIA for BOS, with the same test for what counts as a real difference.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Sunday the least, a gap of 8.7 percentage points.
By month
- Jan: 72.5%
- Feb: 67.5%
- Mar: 67.1%
- Apr: 71.4%
- May: 69.7%
- Jun: 68.4%
- Jul: 57.8%
- Aug: 62.8%
- Sep: 66.7%
- Oct: 72.9%
- Nov: 78.1%
- Dec: 66.4%
July is historically the weakest month and November the strongest, a spread of 20.3 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 51.6% from 192 flights
- August 2023: 56.7% from 206 flights
- September 2023: 57.3% from 234 flights
- October 2023: 71.0% from 247 flights
- November 2023: 69.7% from 240 flights
- December 2023: 62.4% from 269 flights
- January 2024: 70.4% from 281 flights
- February 2024: 64.3% from 293 flights
- March 2024: 69.4% from 306 flights
- April 2024: 68.5% from 259 flights
- May 2024: 64.8% from 217 flights
- June 2024: 71.1% from 210 flights
- July 2024: 67.9% from 218 flights
- August 2024: 61.1% from 232 flights
- September 2024: 73.0% from 241 flights
- October 2024: 80.5% from 261 flights
- November 2024: 85.6% from 299 flights
- December 2024: 74.0% from 344 flights
- January 2025: 78.3% from 303 flights
- February 2025: 76.2% from 341 flights
- March 2025: 71.2% from 366 flights
- April 2025: 78.8% from 359 flights
- May 2025: 64.0% from 248 flights
- June 2025: 66.1% from 233 flights
- July 2025: 54.2% from 246 flights
- August 2025: 69.6% from 240 flights
- September 2025: 69.3% from 232 flights
- October 2025: 66.9% from 249 flights
- November 2025: 77.1% from 296 flights
- December 2025: 61.9% from 360 flights
- January 2026: 68.6% from 304 flights
- February 2026: 61.0% from 342 flights
- March 2026: 61.1% from 387 flights
- April 2026: 66.2% from 367 flights
- May 2026: 81.6% from 206 flights
- June 2026: 68.2% from 177 flights
- July 2026: 57.1% from 187 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 66.8% against 72.7% in the 12 months before — declining by 5.9 percentage points.
Data and methodology
Calculated by FlyerIntel from 9,992 FLL → BOS 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