Carrier route record

WNTPA→AUS

Southwest Airlines · Tampa to Austin

Flights: 1,153
Period: July 2025 to June 2026
Share of route: 76%
Carriers: 2

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Southwest Airlines.

Southwest on TPA to AUS lands a B+, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That is a workable record, not a spotless one. That rests on 1,153 flights, with a median arrival 6 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate Southwest on TPA to AUS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

79.9%

Arrivals under 15 minutes late, of 1,148 completed flights

Avg delay

52 min

Across delayed arrivals only, not all flights

Cancelled

0.26%

National rate is 1.81%

Whole route

79.9%

Every carrier on TPA to AUS, 1,518 flights

These figures cover 1,153 flights between July 2025 and June 2026. The median arrival is 6 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

Southwest against every carrier on TPA to AUS

Southwest flew 1,153 of the 1,518 flights on TPA to AUS, most of the route. Its 79.9% on time is about level with the route as a whole at 79.9%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Southwest at 79.9% to Delta at 79.9%.

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.

On-time performance by carrier on TPA to AUS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines (this page)	1,153	79.9%	52 min	0.26%	B+
Delta Air Lines	365	79.9%	96 min	1.37%	B

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 34 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–8am294 flights94.9%
8am–11am208 flights86.0%
11am–2pm158 flights85.4%
2pm–5pm177 flights71.6%
5pm–8pm253 flights64.4%
8pm–5am63 flights61.3%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

The 8pm–5am window is where this operation falls apart: 61.3% on time, against 94.9% 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 294 flights scheduled in it.

Across the year

Southwest on TPA to AUS through the year

Darker means more delays. Figures are on-time percentages.September best, June worst

June is the worst month at 68.3% on time, 20 points below September, the best at 88.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 126 flights.

Across the week, Wednesday is the strongest day at 87.0% on time and Sunday the weakest at 66.1%. 21 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Southwest runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 48% of the 12,000 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.

Late-arriving aircraft
48%
Carrier
29%
National Airspace System
19%
Extreme weather
4%

48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 12,000 reported delay minutes here, that single category outweighs weather by 12 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 11,913 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 94.9% on time here.

Cancellations are rare at 0.26%, below the national 1.81% 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

6.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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.

The 928 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 73.3% on time across 1,153 flights, 7 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 7 points of difference.

The sample behind these figures is 1,153 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

What to do with this

Booking Southwest on TPA to AUS

Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 88.5% on time and June 68.3%, a swing of 20 points. If the dates move at all, move them out of June before you think about anything else. 1,148 completed flights over 12 months sit behind that.

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.

Key figures