Flight number record

OO 3778

SkyWest Airlines · Chicago to Minneapolis

Route: MDW → MSP
Departs: 09:20
Flights: 308
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3778, 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 3778 lands a B+, about a point 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 308 flights, with a median arrival 9 minutes early.

On time

78.8%

Arrivals under 15 minutes late, of 306 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

0.65%

National rate is 1.81%

1 hour+ late

6.9%

National rate is 8.1%

These figures cover 308 flights between July 2025 and June 2026. The median arrival is 9 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.

Schedule

When OO 3778 flies

OO 3778 flies MDW to MSP without a single fixed slot. Its most common scheduled departure was 09:20, used on 59 of 308 flights, with 09:50 (42 flights) and 09:24 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:2059 flights19.2%
Departs 09:5042 flights13.6%
Departs 09:2440 flights13.0%

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 09:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3778 runs 5 points worse at 78.8%. 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 3778 next to MDW to MSP

Every carrier on MDW to MSP combined arrived on time 76.9% of the time across 2,485 flights, so OO 3778 is 2 points ahead of it. SkyWest flew 891 flights on the same city pair under all its flight numbers, including this one, and those ran 77.2% on time. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 3778 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3778thin sample	308	78.8%	77 min	0.65%	B+
All SkyWest Airlines on MDW–MSP	891	77.2%	83 min	1.35%	B
All carriers on MDW–MSP	2,485	76.9%	66 min	1.65%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3778 quarter by quarter

OO 3778 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.7% on time and its weakest Jul–Sep 2025 at 74.4%, a swing of 17 points on roughly 77 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 202590 flights74.4%
Oct–Dec 202592 flights81.3%
Jan–Mar 202690 flights75.3%
Apr–Jun 202636 flights91.7%

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

By weekday, OO 3778 did best on Sunday at 85.7% on time and worst on Friday at 72.7%. Each day rests on about 44 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3778 runs late

One category carries most of the weight here. Carrier accounts for 69% of the 4,991 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
69%
Extreme weather
20%
National Airspace System
11%

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 4,991 delay minutes reported on OO 3778.

Cancellations are rare at 0.65%, 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

6.9% 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 a little over an hour, which a normal layover absorbs.

The same number turns up on three other city pairs in the data, including MSP to MDW (76), TUS to LAX (24) and ASE to ATL (16), but none flew often enough under OO 3778 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MDW to MSP only.

One caution: this is a thin sample. 308 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 3778

For a booking, read OO 3778 as 78.8% on time with 0.65% cancelled over 308 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