Carrier route record
DLBOS→RSW
Delta Air Lines · Boston to Fort Myers
- Flights
- 582
- Period
- July 2025 to June 2026
- Share of route
- 26%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on BOS to RSW lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 582 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on BOS to RSW from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.5%
Arrivals under 15 minutes late, of 573 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.55%
National rate is 1.81%
Whole route
70.5%
Every carrier on BOS to RSW, 2,253 flights
These figures cover 582 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.
Carrier by carrier
Delta against every carrier on BOS to RSW
Delta flew 582 of the 2,253 flights on BOS to RSW, about 26% of it. Its 77.5% on time is 7 points better than the route as a whole, which runs 70.5%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Delta at 77.5% to Spirit at 34.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 582 | 77.5% | 64 min | 1.55% | B |
| JetBlue Airways | 1,596 | 69.4% | 67 min | 2.63% | C |
| Spirit Airlinesthin sample | 75 | 34.3% | 52 min | 10.67% | F− |
Flight by flight
Delta flight numbers on BOS to RSW
Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am327 flights86.6%
- 8am–11am39 flights82.1%
- 11am–2pm18 flights—
- 2pm–5pm198 flights62.9%
- 5pm–8pm—
- 8pm–5am—
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 86.6% of the time, against 62.9% for the afternoon window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 327 flights scheduled in it.
Across the year
Delta on BOS to RSW through the year
Delays peak in March, when the on-time rate falls to 61.7%. June is the strongest month at 91.7%. Moving a flexible trip across that boundary buys 30 points. April was the busiest month here, with 67 flights.
Across the week, Wednesday is the strongest day at 86.8% on time and Sunday the weakest at 70.6%. 16 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 42% of the 8,292 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%Carrier
- 28%National Airspace System
- 28%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,494 of the 8,292 delay minutes reported here. The split is drawn from 8,292 reported delay minutes.
Cancellations sit at 1.55% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
7.0% 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 about an hour, which a normal layover absorbs.
The 1,249 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 75.8% on time across 582 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 582 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.
What to do with this
Booking Delta on BOS to RSW
Put together: treat all of this as provisional. 582 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 573 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to RSW, every carrier
- Delta on RSW to BOS, the return leg
- JetBlue Airways on BOS to RSW69.4%
- Delta Air Lines network-wide record
- Boston Logan International (BOS) delay statistics
- Southwest Florida International (RSW) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.