Carrier route record
F9BDL→SJU
Frontier Airlines · Hartford to San Juan
- Flights
- 241
- Period
- September 2025 to August 2026
- Share of route
- 25%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on BDL to SJU earns a D, which is as low as this site's scale goes for a reason. Only 56.3% of flights arrive inside the 15-minute window, 21 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 241 flights, with a median arrival 8 minutes late.
The national on-time rate over the same period is 77.3%, so Frontier on BDL to SJU runs 21 points behind the country as a whole. Across a thousand flights that is about 210 extra late arrivals.
Key figures
On time
56.3%
Arrivals under 15 minutes late, of 231 completed flights
Avg delay
97 min
Across delayed arrivals only, not all flights
Cancelled
2.07%
National rate is 1.89%
Whole route
59.0%
Every carrier on BDL to SJU, 968 flights
These figures cover 241 flights between September 2025 and August 2026. Beyond the headline rate, 16.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Frontier against every carrier on BDL to SJU
Frontier flew 241 of the 968 flights on BDL to SJU, about 25% of it. Its 56.3% on time is 3 points worse than the route as a whole, which runs 59.0%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from JetBlue at 59.9% to Frontier at 56.3%.
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 | 59.9% | 89 min | 1.93% | D |
| Frontier Airlines (this page)thin sample | 241 | 56.3% | 97 min | 2.07% | D |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 17 points, against half a point between the best and worst carrier.
- 5am–8am50 flights56.2%
- 8am–11am24 flights—
- 11am–2pm95 flights47.8%
- 2pm–5pm31 flights64.5%
- 5pm–8pm16 flights—
- 8pm–5am25 flights—
Scale runs 40% to 70%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 47.8% on time against 64.5% for 2pm–5pm. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 95 flights scheduled in it.
Across the year
Frontier on BDL to SJU through the year
- Jul–Sep 20252 flights—
- Oct–Dec 202526 flights—
- Jan–Mar 202660 flights60.7%
- Apr–Jun 202691 flights59.6%
- Jul–Sep 202662 flights34.5%
Scale runs 25% 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 56.3% on time across 241 flights.
Frontier on BDL to SJU did not run the same all year. Its best quarter was Jan–Mar 2026 at 60.7% on time and its weakest Jul–Sep 2026 at 34.5%, a swing of 26 points on roughly 80 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.
Across the week, Friday is the strongest day at 63.6% on time and Wednesday the weakest at 46.7%, a spread of 17 points.
Arrival by arrival
How late Frontier on BDL to SJU runs when it is late
The 101 late arrivals split 24 under half an hour, 39 between 30 and 60 minutes, and 38 an hour or more.
- 15+ min early41 flights17.7%
- Within 15 min89 flights38.5%
- 15–29 min late24 flights10.4%
- 30–59 min late39 flights16.9%
- 1–2 hours late19 flights8.2%
- 2+ hours late19 flights8.2%
Scale runs 0% to 100%.
Share of 231 completed flights by arrival against schedule.
14 of 93 late departures made up the time and arrived on time, 15% of them. In the other direction, 22 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SJU.
The worst days
Worst days for Frontier on BDL to SJU
The latest arrival of the period was on 2 March 2026, 15 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across March, February, November and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 March 2026 | 15 hours 43 minutes | Carrier |
| 23 February 2026 | 15 hours 7 minutes | Late-arriving aircraft |
| 22 November 2025 | 10 hours 14 minutes | Carrier |
| 20 July 2026 | 7 hours 39 minutes | Extreme weather |
| 23 July 2026 | 6 hours 13 minutes | National Airspace System |
Delay causes
Why Frontier runs late on this route
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 9,781 reported delay minutes.
- 36%Late-arriving aircraft
- 33%Carrier
- 26%National Airspace System
- 5%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,781 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 9,781 reported delay minutes.
Cancellations sit at 2.07% against a national 1.89%, which is ordinary. Diversions add another 2.07%.
Connections and stage length
What a delay here costs
16.5% 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 71.0% on time across 242 flights, 15 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 15 points of difference.
One caution: this is a thin sample. 241 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. 241 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 56.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 231 completed flights over 12 months sit behind that.
Related
Where to go next
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.