Route reliability record
SJU→BDL
San Juan to Hartford
- Flights
- 968
- Period
- September 2025 to August 2026
- Distance
- 1,666 mi
- Carriers
- 2
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 a little over an hour behind schedule. That rests on 968 SJU to BDL flights, with a median arrival 2 minutes early.
Best time to fly SJU to BDL: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 78.9% of the time and Wednesday flights 73.6%, against 69.8% 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 75 extra late arrivals.
Key figures
On time
69.8%
Arrivals under 15 minutes late, of 943 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
2.27%
National rate is 1.89%
Best carrier
JetBlue
69.4% on time across 726 flights
These figures cover 968 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% 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 SJU to BDL
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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 242 | 71.0% | 51 min | 1.24% | C |
| JetBlue Airways | 726 | 69.4% | 75 min | 2.62% | C |
Flight by flight
Flights on SJU to BDL
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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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 17 points, against half a point between the best and worst carrier.
- 5am–8am345 flights78.9%
- 8am–11am109 flights66.4%
- 11am–2pm66 flights69.7%
- 2pm–5pm166 flights61.7%
- 5pm–8pm228 flights62.2%
- 8pm–5am54 flights75.9%
Scale runs 55% to 85%.
Book the early departure. Flights leaving between 5am–8am arrive on time 78.9% of the time, against 61.7% for the afternoon window. That is 17 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 345 flights scheduled in it.
Explore
Filter SJU to BDL 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 SJU to BDL, the best departure window is 5am–8am at 78.9% on time and the worst is 2pm–5pm at 61.7%, a wide gap of 17.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am78.9%
- 8–11am66.4%
- 11am–2pm69.7%
- 2–5pm61.7%
- 5–8pm62.2%
- 8pm–5am75.9%
best all US flightsScale 55% to 95%.
Across the year
When delays peak on this route
This route's year swings by 37 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.
May is the best month on the calendar at 88.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. December was the busiest month here, with 96 flights.
Across the week, Wednesday is the strongest day at 73.6% on time and Monday the weakest at 67.4%, a spread of 6 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 20,000 reported delay minutes.
- 38%Late-arriving aircraft
- 38%Carrier
- 23%National Airspace System
- 1%Extreme weather
- 0%Security
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 20,000 reported delay minutes here, that single category outweighs weather by 38 to one. The split is drawn from 19,648 reported delay minutes.
The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,431 of the 20,000 delay minutes reported here.
Cancellations sit at 2.27% against a national 1.89%, which is ordinary. Diversions add another 0.31%.
Connections and stage length
What a delay here actually costs
10.2% 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.
At 1,666 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 59.0% on time across 968 flights, 11 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 11 points of difference.
One caution: this is a thin sample. 968 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.
Work out the risk of missing a connection in BDL after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 968 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 69.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 943 completed flights over 12 months sit behind that.
Common questions
SJU to BDL questions
How often is SJU to BDL 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 30.2% of the 968 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is SJU to BDL compared with the rest of the country?
69.8% of flights arrive on time here against a national 77.3%, a difference of 8 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on SJU to BDL?
The 5am–8am departure window is the strongest at 78.9% on time. The 2pm–5pm window is the weakest at 61.7%, 17 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 October delays on SJU to BDL?
October is the weakest month at 50.9% on time, compared with 88.0% in May. Across the year that is 37 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
- BDL to SJU — the return legseparate record
- Luis Munoz Marin International (SJU) delay statistics
- Frontier Airlines on SJU to BDL71.0%
- JetBlue Airways on SJU to BDL69.4%
- SJU to MCO, a related route78.0%
- ORD to BDL, a related route74.5%
- SJU to JFK, a related route77.8%
- Frontier Airlines on-time record71.0%
- JetBlue Airways on-time record69.4%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. SJU to BDL and BDL to SJU 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.