Carrier route record
WNTPA→SJU
Southwest Airlines · Tampa to San Juan
- Flights
- 470
- 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 TPA to SJU draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is roughly 50 minutes behind schedule. Build slack into anything you connect to. That rests on 470 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so Southwest on TPA to SJU runs 11 points behind the country as a whole. Across a thousand flights that is about 108 extra late arrivals.
Key figures
On time
66.5%
Arrivals under 15 minutes late, of 468 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.43%
National rate is 1.89%
Whole route
72.7%
Every carrier on TPA to SJU, 1,561 flights
These figures cover 470 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Southwest against every carrier on TPA to SJU
Southwest flew 470 of the 1,561 flights on TPA to SJU, about 30% of it. Its 66.5% on time is 6 points worse than the route as a whole, which runs 72.7%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from Spirit at 81.8% to Southwest at 66.5%. 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 |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 51 | 81.8% | 34 min | 13.73% | B− |
| JetBlue Airways | 680 | 76.0% | 81 min | 1.62% | B |
| Frontier Airlinesthin sample | 360 | 73.3% | 109 min | 2.22% | C |
| Southwest Airlines (this page) | 470 | 66.5% | 52 min | 0.43% | 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 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 56 points, against half a point between the best and worst carrier.
- 5am–8am94 flights94.6%
- 8am–11am16 flights—
- 11am–2pm157 flights74.5%
- 2pm–5pm39 flights71.1%
- 5pm–8pm41 flights48.8%
- 8pm–5am123 flights38.2%
Scale runs 30% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 38.2% on time, against 94.6% 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 11am–2pm window is the busiest, with 157 flights scheduled in it.
Across the year
Southwest on TPA to SJU through the year
September is the best month on the calendar at 86.7% 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, Tuesday is the strongest day at 83.3% on time and Thursday the weakest at 47.5%, a spread of 36 points.
Arrival by arrival
How late Southwest on TPA to SJU runs when it is late
The 157 late arrivals split 57 under half an hour, 58 between 30 and 60 minutes, and 42 an hour or more.
- 15+ min early13 flights2.8%
- Within 15 min298 flights63.7%
- 15–29 min late57 flights12.2%
- 30–59 min late58 flights12.4%
- 1–2 hours late29 flights6.2%
- 2+ hours late13 flights2.8%
Scale runs 0% to 100%.
Share of 468 completed flights by arrival against schedule.
37 of 182 late departures made up the time and arrived on time, 20% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for Southwest on TPA to SJU
The latest arrival of the period was on 19 June 2026, 5 hours 59 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 June 2026 | 5 hours 59 minutes | Late-arriving aircraft |
| 16 March 2026 | 3 hours 27 minutes | Late-arriving aircraft |
| 18 May 2026 | 3 hours 5 minutes | Late-arriving aircraft |
| 3 July 2026 | 2 hours 43 minutes | Late-arriving aircraft |
| 22 June 2026 | 2 hours 40 minutes | Late-arriving aircraft |
Delay causes
Why Southwest runs late on this route
Late-arriving aircraft accounts for 60% of the 8,191 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Late-arriving aircraft
- 32%Carrier
- 6%National Airspace System
- 3%Extreme weather
60% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,191 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 8,191 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 94.6% on time here.
Cancellations are rare at 0.43%, 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
9.0% 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.
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 79.6% on time across 469 flights, 13 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 13 points of difference.
One caution: this is a thin sample. 470 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 TPA to SJU
Put together: treat all of this as provisional. 470 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 66.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 468 completed flights over 12 months sit behind that.
Related
Where to go next
- TPA to SJU, every carrier
- Southwest on SJU to TPA, the return leg
- JetBlue Airways on TPA to SJU76.0%
- Frontier Airlines on TPA to SJU73.3%
- Southwest Airlines network-wide record
- Tampa International (TPA) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
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.