Flight number record

OO 3731

SkyWest Airlines · Austin to Indianapolis

Route: AUS → IND
Departs: 19:15
Flights: 322
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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+, 3 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 a little over an hour on average. That rests on 322 flights, with a median arrival 8 minutes early.

On time

80.1%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.89%

1 hour+ late

9.7%

National rate is 8.3%

These figures cover 322 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When OO 3731 flies

OO 3731 flies AUS to IND without a single fixed slot. Its most common scheduled departure was 19:15, used on 52 of 322 flights.

Departs 19:1552 flights16.1%

Scale runs 0% to 100%.

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

A 19:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 3731 runs 12 points better at 80.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

OO 3731 next to AUS to IND

Every carrier on AUS to IND combined arrived on time 78.2% of the time across 1,359 flights, so OO 3731 is 2 points ahead of it. SkyWest flew 552 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network SkyWest Airlines managed 78.7%, 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	322	80.1%	77 min	0.31%	B+
All SkyWest Airlines on AUS–IND	552	80.9%	90 min	0.36%	B+
All carriers on AUS–IND	1,359	78.2%	66 min	0.52%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	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 2026 at 74.1%, a swing of 15 points on roughly 64 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 202530 flights83.3%
Oct–Dec 202592 flights79.3%
Jan–Mar 202666 flights89.2%
Apr–Jun 202676 flights76.3%
Jul–Sep 202658 flights74.1%

Scale runs 65% to 95%.

By weekday, OO 3731 did best on Wednesday at 89.4% on time and worst on Monday at 70.8%. Each day rests on about 46 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 3731 runs when it is late

OO 3731 often beats the schedule: 97 of 321 completed flights, 30%, arrived 15 minutes or more early. The 64 late arrivals split 19 under half an hour, 14 between 30 and 60 minutes, and 31 an hour or more.

15+ min early97 flights30.2%
Within 15 min160 flights49.8%
15–29 min late19 flights5.9%
30–59 min late14 flights4.4%
1–2 hours late20 flights6.2%
2+ hours late11 flights3.4%

Scale runs 0% to 100%.

Share of 321 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 54 departures that left 15 minutes late or more, only 4 made it up before arrival. 14 flights left on time and still arrived late.

The worst days

Worst days for OO 3731

The latest arrival of the period was on 1 August 2026, 11 hours 54 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.

The latest arrivals of OO 3731 in the period
Date	Arrived late by	Largest filed cause
1 August 2026	11 hours 54 minutes	Carrier
30 April 2026	3 hours 43 minutes	Carrier
21 October 2025	3 hours 18 minutes	Carrier
16 September 2025	3 hours 4 minutes	Carrier
3 June 2026	2 hours 59 minutes	Carrier

Delay causes

Why OO 3731 runs late

Carrier accounts for 63% of the 4,919 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
63%
Extreme weather
20%
National Airspace System
18%

Extreme weather accounts for 20% 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 3.2 times the usual weather exposure. The split is drawn from 4,919 delay minutes reported on OO 3731.

Cancellations are rare at 0.31%, 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 routes

What a delay on this flight costs

9.7% 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 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.

Every one of the 322 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. 322 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 80.1% on time with 0.31% cancelled over 322 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures