Flight number record
DL 1401
Delta Air Lines · Boston to Fort Lauderdale
- Route
- BOS → FLL
- Departs
- 07:10
- Flights
- 324
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1401, check with Delta Air Lines.
DL 1401 lands a B−, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 324 flights, with a median arrival 5 minutes early.
Key figures
On time
81.5%
Arrivals under 15 minutes late, of 313 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
3.40%
National rate is 1.81%
1 hour+ late
5.4%
National rate is 8.1%
These figures cover 324 flights between July 2025 and June 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Schedule
When DL 1401 flies
DL 1401 flies BOS to FLL without a single fixed slot. Its most common scheduled departure was 07:10, used on 115 of 324 flights, with 07:05 (107 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 07:10115 flights35.5%
- Departs 07:05107 flights33.0%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 07:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1401 runs 8 points worse at 81.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
DL 1401 next to BOS to FLL
Every carrier on BOS to FLL combined arrived on time 66.7% of the time across 3,417 flights, so DL 1401 is 15 points ahead of it. Delta flew 885 flights on the same city pair under all its flight numbers, including this one, and those ran 69.5% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1401thin sample | 324 | 81.5% | 68 min | 3.40% | B− |
| All Delta Air Lines on BOS–FLL | 885 | 69.5% | 78 min | 3.05% | C− |
| All carriers on BOS–FLL | 3,417 | 66.7% | 73 min | 3.45% | C− |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1401 quarter by quarter
DL 1401 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.0% on time and its weakest Jan–Mar 2026 at 74.7%, a swing of 11 points on roughly 81 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202551 flights86.0%
- Oct–Dec 202592 flights81.1%
- Jan–Mar 202690 flights74.7%
- Apr–Jun 202691 flights85.6%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1401 did best on Wednesday at 87.0% on time and worst on Monday at 75.0%. Each day rests on about 46 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1401 runs late
One category carries most of the weight here. Carrier accounts for 45% of the 3,952 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.
- 45%Carrier
- 38%National Airspace System
- 12%Late-arriving aircraft
- 4%Extreme weather
38% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,497 minutes out of 3,952, against a national NAS share of 21%. The split is drawn from 3,952 delay minutes reported on DL 1401.
Cancellations run at 3.40%, 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 routes
What a delay on this flight costs
5.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
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.
DL 1401 is not only a BOS to FLL flight. It also flew FLL to BOS (309 flights, 68.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 324 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| FLL to BOSthin sample | 309 | 68.1% | 74 min | 2.59% | C |
What to do with this
Booking DL 1401
For a booking, the cancellation rate is the figure to plan around on DL 1401: 3.40% of its 324 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to FLL, every carrier and departure
- FLL to BOS, the return direction
- Delta Air Lines 2196 on the same route60.2%
- JetBlue Airways 569 on the same route80.4%
- JetBlue Airways 69 on the same route65.3%
- Boston Logan International (BOS) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.