Carrier route record
F9BDL→SJU
Frontier Airlines · Hartford to San Juan
- Flights
- 234
- Period
- July 2025 to June 2026
- Share of route
- 24%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on BDL to SJU draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 234 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.6%, so Frontier on BDL to SJU runs 16 points behind the country as a whole. Across a thousand flights that is about 161 extra late arrivals.
Key figures
On time
61.5%
Arrivals under 15 minutes late, of 221 completed flights
Avg delay
108 min
Across delayed arrivals only, not all flights
Cancelled
2.56%
National rate is 1.81%
Whole route
63.5%
Every carrier on BDL to SJU, 961 flights
These figures cover 234 flights between July 2025 and June 2026. Beyond the headline rate, 14.9% 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
Frontier against every carrier on BDL to SJU
Frontier flew 234 of the 961 flights on BDL to SJU, about 24% of it. Its 61.5% on time is 2 points worse than the route as a whole, which runs 63.5%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from JetBlue at 64.1% to Frontier at 61.5%.
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 |
|---|---|---|---|---|---|
| JetBlue Airways | 727 | 64.1% | 90 min | 1.65% | D |
| Frontier Airlines (this page)thin sample | 234 | 61.5% | 108 min | 2.56% | D |
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 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–8am50 flights56.2%
- 8am–11am38 flights66.7%
- 11am–2pm65 flights61.7%
- 2pm–5pm31 flights61.3%
- 5pm–8pm16 flights—
- 8pm–5am34 flights61.8%
Scale runs 50% to 70%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 66.7% of the time, against 56.2% for the early window. That is 11 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 65 flights scheduled in it.
Across the year
Frontier on BDL to SJU through the year
- Jul–Sep 202557 flights54.0%
- Oct–Dec 202526 flights—
- Jan–Mar 202660 flights60.7%
- Apr–Jun 202691 flights59.6%
Scale runs 45% to 65%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 61.5% on time across 234 flights.
Quarter by quarter Frontier on BDL to SJU held fairly steady: 54.0% in Jul–Sep 2025, 60.7% in Jan–Mar 2026 and 59.6% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Friday is the strongest day at 69.7% on time and Thursday the weakest at 48.6%. 21 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Frontier runs late on this route
One category carries most of the weight here. Carrier accounts for 46% of the 9,175 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.
- 46%Carrier
- 33%Late-arriving aircraft
- 18%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 46%, 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 4,265 of the 9,175 delay minutes reported here. The split is drawn from 9,175 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 66.7% on time here.
Cancellations run at 2.56%, against 1.81% nationally. That is about one flight in 40 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. 14.9% 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.
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 75.8% on time across 235 flights, 14 points above 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 14 points of difference.
One caution: this is a thin sample. 234 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 Frontier on BDL to SJU
Put together: treat all of this as provisional. 234 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 61.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 221 completed flights over 12 months sit behind that.
Related
Where to go next
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.