Route reliability record
RSW→BOS
Fort Myers to Boston
- Flights
- 2,168
- Period
- September 2025 to August 2026
- Distance
- 1,249 mi
- Carriers
- 3
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 2,168 RSW to BOS flights, of which Delta Air Lines flew 549 at 75.3% on time.
Best time to fly RSW to BOS: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 90.9% of the time and Wednesday flights 77.2%, against 69.5% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 8 points behind the country as a whole. Across a thousand flights that is about 78 extra late arrivals.
Key figures
On time
69.5%
Arrivals under 15 minutes late, of 2,105 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
2.91%
National rate is 1.89%
Best carrier
Delta
75.3% on time across 549 flights
These figures cover 2,168 flights between September 2025 and August 2026. Beyond the headline rate, 12.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on RSW to BOS
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 75.3% of the time; JetBlue Airways manages 69.1%. Sample sizes sit next to every figure, because a two-point gap across 1,543 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 549 | 75.3% | 78 min | 1.28% | B |
| JetBlue Airways | 1,543 | 69.1% | 87 min | 3.05% | C− |
| Spirit Airlinesthin sample | 76 | 34.3% | 72 min | 11.84% | F− |
JetBlue Airways cancels 3.0% 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
Flights on RSW to BOS
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Fort Myers to Boston
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. RSW → BOSFort Myers to Boston | Delta Air Lines | 74.3% | 75.3% | 1.28% | 8am–11am, Wed | — |
| 2. RSW → BOSFort Myers to Boston | JetBlue Airways | 67.0% | 69.1% | 3.05% | 5am–8am, Wed | B6 266 11:04 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 36 points, against 6 points between the best and worst carrier.
- 5am–8am325 flights90.9%
- 8am–11am332 flights78.1%
- 11am–2pm585 flights72.7%
- 2pm–5pm273 flights57.0%
- 5pm–8pm321 flights54.7%
- 8pm–5am332 flights58.8%
Scale runs 45% to 95%.
The 5pm–8pm window is where this operation falls apart: 54.7% on time, against 90.9% 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 11am–2pm window is the busiest, with 585 flights scheduled in it.
Explore
Filter RSW to BOS by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On RSW to BOS, the best departure window is 5am–8am at 90.9% on time and the worst is 5pm–8pm at 54.7%, a wide gap of 36.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.9%
- 8–11am78.1%
- 11am–2pm72.7%
- 2–5pm57.0%
- 5–8pm54.7%
- 8pm–5am58.8%
best all US flightsScale 45% to 95%.
Across the year
When delays peak on this route
This route's year swings by 24 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
Delays peak in March, when the on-time rate falls to 60.8%. June is the strongest month at 84.6%. Moving a flexible trip across that boundary buys 24 points. March was the busiest month here, with 326 flights.
Across the week, Wednesday is the strongest day at 77.2% on time and Thursday the weakest at 65.5%, a spread of 12 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 45% of the 54,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 27%Carrier
- 25%National Airspace System
- 3%Extreme weather
- 0%Security
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 54,000 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 54,068 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 90.9% on time here.
Cancellations run at 2.91%, against 1.89% nationally. That is roughly 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 actually costs
12.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
The return leg runs 70.4% on time across 2,167 flights, within about 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 2,168 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.
Work out the risk of missing a connection in BOS after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 2.91% cancellation rate. A late arrival costs you an hour and a half; 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. 2,105 completed flights over 12 months sit behind that.
Common questions
RSW to BOS questions
How often is RSW to BOS delayed?
Roughly one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 30.5% of the 2,168 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on RSW to BOS?
Delta Air Lines leads at 75.3% on time across 549 flights. JetBlue Airways is at the other end on 69.1%, a gap of 6 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on RSW to BOS?
The 5am–8am departure window is the strongest at 90.9% on time. The 5pm–8pm window is the weakest at 54.7%, 36 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on RSW to BOS?
March is the weakest month at 60.8% on time, compared with 84.6% in June. Across the year that is 24 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- BOS to RSW — the return legseparate record
- Southwest Florida International (RSW) delay statistics
- Boston Logan International (BOS) delay statistics
- Delta Air Lines on RSW to BOS75.3%
- JetBlue Airways on RSW to BOS69.1%
- RSW to ORD, a related route76.4%
- DCA to BOS, a related route70.1%
- RSW to ATL, a related route85.4%
- Delta Air Lines on-time record75.3%
- JetBlue Airways on-time record69.1%
- Spirit Airlines on-time record34.3%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. RSW to BOS and BOS to RSW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.