Flight number record

OO 3731

SkyWest Airlines · Austin to Indianapolis

Route: AUS → IND
Departs: 19:23
Flights: 326
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3731, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

OO 3731 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 a little over an hour on average. That is a workable record, not a spotless one. That rests on 326 flights, with a median arrival 6 minutes early.

On time

79.4%

Arrivals under 15 minutes late, of 325 completed flights

Avg delay

73 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.81%

1 hour+ late

11.1%

National rate is 8.1%

These figures cover 326 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 3731 flies

OO 3731 flies AUS to IND without a single fixed slot. Its most common scheduled departure was 19:23, used on 56 of 326 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:2356 flights17.2%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 19:23 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 3731 runs 11 points better at 79.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 3731 next to AUS to IND

Every carrier on AUS to IND combined arrived on time 77.1% of the time across 1,177 flights, so OO 3731 is 2 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 3731 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3731thin sample	326	79.4%	73 min	0.31%	B+
All SkyWest Airlines on AUS–IND	454	79.4%	82 min	0.44%	B+
All carriers on AUS–IND	1,177	77.1%	63 min	0.51%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3731 quarter by quarter

OO 3731 did not run the same all year. Its best quarter was Jan–Mar 2026 at 89.2% on time and its weakest Jul–Sep 2025 at 75.0%, a swing of 14 points on roughly 82 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.

Jul–Sep 202592 flights75.0%
Oct–Dec 202592 flights79.3%
Jan–Mar 202666 flights89.2%
Apr–Jun 202676 flights76.3%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3731 did best on Wednesday at 85.1% on time and worst on Tuesday at 70.8%. Each day rests on about 47 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3731 runs late

One category carries most of the weight here. Carrier accounts for 58% of the 4,869 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.

Carrier
58%
National Airspace System
25%
Extreme weather
18%

Extreme weather accounts for 18% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.9 times the usual weather exposure. The split is drawn from 4,869 delay minutes reported on OO 3731.

Cancellations are rare at 0.31%, 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 routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The 919 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.

Every one of the 326 flights under OO 3731 in the data flew AUS to IND. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 326 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 OO 3731

For a booking, read OO 3731 as 79.4% on time with 0.31% cancelled over 326 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

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