Flight number record
OO 3996
SkyWest Airlines · Washington to Minneapolis
- Route
- IAD → MSP
- Departs
- 06:00
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3996, 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 3996 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 3.1 hours. That rests on 265 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 3996's record is 15 points better than the US average of 77.3%. That gap is worth roughly 146 fewer late arrivals for every thousand flights.
Key figures
On time
91.9%
Arrivals under 15 minutes late, of 259 completed flights
Avg delay
189 min
Across delayed arrivals only, not all flights
Cancelled
2.26%
National rate is 1.89%
1 hour+ late
5.0%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. The median arrival is 14 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.
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Schedule
When OO 3996 flies
OO 3996 flies IAD to MSP without a single fixed slot. Its most common scheduled departure was 06:00, used on 141 of 265 flights, with 07:00 (98 flights) next.
- Departs 06:00141 flights53.2%
- Departs 07:0098 flights37.0%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3996 runs 3 points better at 91.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 3996 next to IAD to MSP
Every carrier on IAD to MSP combined arrived on time 85.9% of the time across 1,026 flights, so OO 3996 is 6 points ahead of it. SkyWest flew 851 flights on the same city pair under all its flight numbers, including this one, and those ran 85.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3996thin sample | 265 | 91.9% | 189 min | 2.26% | A |
| All SkyWest Airlines on IAD–MSP | 851 | 85.8% | 104 min | 1.18% | A |
| All carriers on IAD–MSP | 1,026 | 85.9% | 97 min | 1.46% | A |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3996 quarter by quarter
Quarter by quarter OO 3996 held fairly steady: 87.1% in Jan–Mar 2026, 93.3% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202510 flights—
- Oct–Dec 202512 flights—
- Jan–Mar 202690 flights87.1%
- Apr–Jun 202691 flights93.3%
- Jul–Sep 202662 flights95.2%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 3996 did best on Thursday at 100.0% on time and worst on Wednesday at 86.5%. Each day rests on about 38 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3996 runs when it is late
OO 3996 often beats the schedule: 123 of 259 completed flights, 47%, arrived 15 minutes or more early. When OO 3996 is late it tends to be very late: 13 of its 21 late arrivals were an hour or more behind, and 10 were two hours or more.
- 15+ min early123 flights47.5%
- Within 15 min115 flights44.4%
- 15–29 min late8 flights3.1%
- 30–59 min late0 flights0.0%
- 1–2 hours late3 flights1.2%
- 2+ hours late10 flights3.9%
Scale runs 0% to 100%.
Share of 259 completed flights by arrival against schedule.
Only 15 of 259 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for OO 3996
The latest arrival of the period was on 10 April 2026, 12 hours 33 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 April 2026 | 12 hours 33 minutes | Carrier |
| 23 January 2026 | 8 hours 36 minutes | Carrier |
| 25 March 2026 | 8 hours 18 minutes | Carrier |
| 20 May 2026 | 6 hours 21 minutes | Carrier |
| 1 June 2026 | 5 hours 28 minutes | Carrier |
Delay causes
Why OO 3996 runs late
Carrier accounts for 95% of the 3,964 delay minutes carriers reported here, and the remaining four split what is left.
- 95%Carrier
- 5%National Airspace System
- 0%Extreme weather
The largest share of delay minutes, 95%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,780 of the 3,964 delay minutes reported here. The split is drawn from 3,964 delay minutes reported on OO 3996.
Cancellations sit at 2.26% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 3.1 hours, which a normal layover absorbs.
The 907 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 265 flights under OO 3996 in the data flew IAD to MSP. 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. 265 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 3996
For a booking, read OO 3996 as 91.9% on time with 2.26% cancelled over 265 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAD to MSP, every carrier and departure
- MSP to IAD, the return direction
- SkyWest Airlines 3783 on the same route78.9%
- Washington Dulles International (IAD) delay statistics
- Minneapolis-St Paul International (MSP) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.