Carrier route record
F9SJU→BDL
Frontier Airlines · San Juan to Hartford
- Flights
- 242
- 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 SJU to BDL sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land roughly 50 minutes behind schedule. That rests on 242 flights, with a median arrival 7 minutes early.
The national on-time rate over the same period is 77.3%, so Frontier on SJU to BDL runs 6 points behind the country as a whole. Across a thousand flights that is about 63 extra late arrivals.
Key figures
On time
71.0%
Arrivals under 15 minutes late, of 238 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
1.24%
National rate is 1.89%
Whole route
69.8%
Every carrier on SJU to BDL, 968 flights
These figures cover 242 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Frontier against every carrier on SJU to BDL
Frontier flew 242 of the 968 flights on SJU to BDL, about 25% of it. Its 71.0% on time is about level with the route as a whole at 69.8%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Frontier at 71.0% to JetBlue at 69.4%.
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 Airlines (this page)thin sample | 242 | 71.0% | 51 min | 1.24% | C |
| JetBlue Airways | 726 | 69.4% | 75 min | 2.62% | C |
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 12 points, against half a point between the best and worst carrier.
- 5am–8am38 flights77.8%
- 8am–11am109 flights66.4%
- 11am–2pm7 flights—
- 2pm–5pm38 flights65.8%
- 5pm–8pm—
- 8pm–5am50 flights76.0%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 77.8% of the time, against 65.8% for the afternoon window. That is 12 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 109 flights scheduled in it.
Across the year
Frontier on SJU to BDL through the year
- Jul–Sep 20252 flights—
- Oct–Dec 202527 flights—
- Jan–Mar 202660 flights74.1%
- Apr–Jun 202691 flights78.0%
- Jul–Sep 202662 flights53.3%
Scale runs 45% to 85%. 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 71.0% on time across 242 flights.
Frontier on SJU to BDL did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.0% on time and its weakest Jul–Sep 2026 at 53.3%, a swing of 25 points on roughly 81 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, Saturday is the strongest day at 82.9% on time and Monday the weakest at 57.6%, a spread of 25 points.
Arrival by arrival
How late Frontier on SJU to BDL runs when it is late
Frontier on SJU to BDL often beats the schedule: 83 of 238 completed flights, 35%, arrived 15 minutes or more early. The 69 late arrivals split 27 under half an hour, 23 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early83 flights34.9%
- Within 15 min86 flights36.1%
- 15–29 min late27 flights11.3%
- 30–59 min late23 flights9.7%
- 1–2 hours late13 flights5.5%
- 2+ hours late6 flights2.5%
Scale runs 0% to 100%.
Share of 238 completed flights by arrival against schedule.
7 of 44 late departures made up the time and arrived on time, 16% of them. In the other direction, 32 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 BDL.
The worst days
Worst days for Frontier on SJU to BDL
The latest arrival of the period was on 1 August 2026, 3 hours 27 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 August 2026 | 3 hours 27 minutes | Carrier |
| 22 November 2025 | 2 hours 55 minutes | Carrier |
| 7 April 2026 | 2 hours 25 minutes | Late-arriving aircraft |
| 23 November 2025 | 2 hours 23 minutes | Carrier |
| 10 August 2026 | 2 hours 19 minutes | Late-arriving aircraft |
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 3,539 reported delay minutes.
- 39%Carrier
- 31%Late-arriving aircraft
- 30%National Airspace System
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,391 of the 3,539 delay minutes reported here. The split is drawn from 3,539 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 77.8% on time here.
Cancellations sit at 1.24% against a national 1.89%, which is ordinary. Diversions add another 0.41%.
Connections and stage length
What a delay here costs
8.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.
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 56.3% on time across 241 flights, 15 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 15 points of difference.
One caution: this is a thin sample. 242 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 SJU to BDL
Put together: treat all of this as provisional. 242 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 71.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 238 completed flights over 12 months sit behind that.
Related
Where to go next
- SJU to BDL, every carrier
- Frontier on BDL to SJU, the return leg
- JetBlue Airways on SJU to BDL69.4%
- Frontier Airlines network-wide record
- Luis Munoz Marin International (SJU) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- Connecting flights: how much buffer the data says you need
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.