Flight number record

OO 3837

SkyWest Airlines · South Bend to Detroit

Route: SBN → DTW
Departs: 08:20
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3837, 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 3837 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 about 2.6 hours on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 10 minutes early.

On time

79.7%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

157 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

13.9%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 13.9% 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 3837 flies

OO 3837 flies SBN to DTW without a single fixed slot. Its most common scheduled departure was 08:20, used on 169 of 365 flights, with 08:10 (41 flights) and 08:24 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:20169 flights46.3%
Departs 08:1041 flights11.2%
Departs 08:2440 flights11.0%

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 08:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3837 runs 4 points worse at 79.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 3837 next to SBN to DTW

Every carrier on SBN to DTW combined arrived on time 79.5% of the time across 711 flights, so OO 3837 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 3837 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3837	365	79.7%	157 min	1.37%	B
All SkyWest Airlines on SBN–DTW	711	79.5%	133 min	1.13%	B
All carriers on SBN–DTW	711	79.5%	133 min	1.13%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3837 quarter by quarter

OO 3837 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.1% on time and its weakest Jan–Mar 2026 at 60.9%, a swing of 30 points on roughly 91 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 flights90.2%
Oct–Dec 202592 flights75.6%
Jan–Mar 202690 flights60.9%
Apr–Jun 202691 flights91.1%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3837 did best on Thursday at 92.2% on time and worst on Monday at 67.3%. Each day rests on about 52 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3837 runs late

One category carries most of the weight here. Carrier accounts for 82% of the 11,000 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.

Carrier
82%
Extreme weather
10%
National Airspace System
8%

The largest share of delay minutes, 82%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 9,364 of the 11,000 delay minutes reported here. The split is drawn from 11,431 delay minutes reported on OO 3837.

Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.27%.

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. 13.9% 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.

Every one of the 365 flights under OO 3837 in the data flew SBN to DTW. 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. 365 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 3837

For a booking, OO 3837 is a flight to put a long connection behind. 13.9% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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