Carrier route record
WNSJU→TPA
Southwest Airlines · San Juan to Tampa
- Flights
- 469
- Period
- September 2025 to August 2026
- Share of route
- 30%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Southwest Airlines.
Southwest on SJU to TPA lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 469 flights, with a median arrival 1 minute early.
The US average over the same twelve months is 77.3%, so there is little to separate Southwest on SJU to TPA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.6%
Arrivals under 15 minutes late, of 465 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.85%
National rate is 1.89%
Whole route
77.2%
Every carrier on SJU to TPA, 1,562 flights
These figures cover 469 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Carrier by carrier
Southwest against every carrier on SJU to TPA
Southwest flew 469 of the 1,562 flights on SJU to TPA, about 30% of it. Its 79.6% on time is 2 points better than the route as a whole, which runs 77.2%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Southwest at 79.6% to Spirit at 55.8%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| Southwest Airlines (this page) | 469 | 79.6% | 59 min | 0.85% | B+ |
| JetBlue Airways | 680 | 77.1% | 72 min | 1.47% | B |
| Frontier Airlinesthin sample | 363 | 76.8% | 87 min | 2.48% | B |
| Spirit Airlinesthin sample | 50 | 55.8% | 51 min | 14.00% | 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 Southwest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 46 points, against half a point between the best and worst carrier.
- 5am–8am207 flights95.1%
- 8am–11am25 flights—
- 11am–2pm18 flights—
- 2pm–5pm112 flights74.1%
- 5pm–8pm45 flights48.9%
- 8pm–5am62 flights53.3%
Scale runs 40% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 48.9% on time, against 95.1% 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 5am–8am window is the busiest, with 207 flights scheduled in it.
Across the year
Southwest on SJU to TPA through the year
November is the best month on the calendar at 91.4% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 62 flights.
Across the week, Monday is the strongest day at 86.9% on time and Saturday the weakest at 73.0%, a spread of 14 points.
Arrival by arrival
How late Southwest on SJU to TPA runs when it is late
The 95 late arrivals split 47 under half an hour, 26 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early27 flights5.8%
- Within 15 min343 flights73.8%
- 15–29 min late47 flights10.1%
- 30–59 min late26 flights5.6%
- 1–2 hours late8 flights1.7%
- 2+ hours late14 flights3.0%
Scale runs 0% to 100%.
Share of 465 completed flights by arrival against schedule.
34 of 122 late departures made up the time and arrived on time, 28% of them. Only 7 left on time and still arrived late.
The worst days
Worst days for Southwest on SJU to TPA
The latest arrival of the period was on 18 July 2026, 5 hours 43 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 July 2026 | 5 hours 43 minutes | Late-arriving aircraft |
| 5 September 2025 | 5 hours 2 minutes | Carrier |
| 27 June 2026 | 4 hours 52 minutes | Carrier |
| 24 June 2026 | 3 hours 51 minutes | Late-arriving aircraft |
| 27 December 2025 | 3 hours 43 minutes | Late-arriving aircraft |
Delay causes
Why Southwest runs late on this route
Late-arriving aircraft accounts for 56% of the 5,553 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Late-arriving aircraft
- 41%Carrier
- 3%National Airspace System
- 0%Extreme weather
56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,553 reported delay minutes here, that single category outweighs weather by 56 to one. The split is drawn from 5,553 reported delay minutes.
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,252 of the 5,553 delay minutes reported here.
Cancellations are rare at 0.85%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,237 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 is a different operation and performs like one: it runs 66.5% on time across 470 flights, 13 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 13 points of difference.
One caution: this is a thin sample. 469 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 Southwest on SJU to TPA
Put together: treat all of this as provisional. 469 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 79.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 465 completed flights over 12 months sit behind that.
Related
Where to go next
- SJU to TPA, every carrier
- Southwest on TPA to SJU, the return leg
- JetBlue Airways on SJU to TPA77.1%
- Frontier Airlines on SJU to TPA76.8%
- Southwest Airlines network-wide record
- Luis Munoz Marin International (SJU) delay statistics
- Tampa International (TPA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.