Carrier route record
B6BOS→FLL
JetBlue Airways · Boston to Fort Lauderdale
- Flights
- 1,961
- Period
- July 2025 to June 2026
- Share of route
- 57%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on BOS to FLL draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 1,961 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 885 at 69.5% on time.
The national on-time rate over the same period is 77.6%, so JetBlue on BOS to FLL runs 12 points behind the country as a whole. Across a thousand flights that is about 115 extra late arrivals.
Key figures
On time
66.1%
Arrivals under 15 minutes late, of 1,890 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
3.16%
National rate is 1.81%
Whole route
66.7%
Every carrier on BOS to FLL, 3,417 flights
These figures cover 1,961 flights between July 2025 and June 2026. Beyond the headline rate, 13.3% 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
JetBlue against every carrier on BOS to FLL
JetBlue flew 1,961 of the 3,417 flights on BOS to FLL, most of the route. Its 66.1% on time is about level with the route as a whole at 66.7%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Delta at 69.5% to Spirit at 64.6%.
The two carriers here are closely matched: 5 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 |
|---|---|---|---|---|---|
| Delta Air Lines | 885 | 69.5% | 78 min | 3.05% | C− |
| JetBlue Airways (this page) | 1,961 | 66.1% | 69 min | 3.16% | C− |
| Spirit Airlines | 571 | 64.6% | 82 min | 5.08% | D− |
Spirit Airlines cancels 5.1% 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
JetBlue flight numbers on BOS to FLL
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am445 flights78.0%
- 8am–11am374 flights73.9%
- 11am–2pm248 flights69.5%
- 2pm–5pm258 flights55.6%
- 5pm–8pm430 flights57.6%
- 8pm–5am206 flights53.3%
Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 53.3% on time, against 78.0% 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 445 flights scheduled in it.
Across the year
JetBlue on BOS to FLL through the year
December is the weak month at 51.3% on time, against 78.9% 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 235 flights.
Across the week, Wednesday is the strongest day at 77.8% on time and Sunday the weakest at 53.9%. 24 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 44,000 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.
- 42%Late-arriving aircraft
- 30%National Airspace System
- 25%Carrier
- 3%Extreme weather
42% 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 44,000 reported delay minutes here, that single category outweighs weather by 15 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 43,972 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 78.0% on time here.
Cancellations run at 3.16%, against 1.81% nationally. That is about one flight in 30 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. 13.3% 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 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. 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 runs 65.6% on time across 1,952 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 1,961 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 JetBlue on BOS to FLL
Put together: the delay figures matter less here than the 3.16% 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. 1,890 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to FLL, every carrier
- JetBlue on FLL to BOS, the return leg
- Delta Air Lines on BOS to FLL69.5%
- Spirit Airlines on BOS to FLL64.6%
- JetBlue Airways network-wide record
- Boston Logan International (BOS) 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.