Flight number record
OO 6401
SkyWest Airlines · Medford to Phoenix
- Route
- MFR → PHX
- Departs
- 05:20
- Flights
- 252
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 6401, 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 6401 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 3.6 hours. That rests on 252 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 6401's record is 16 points better than the US average of 77.3%. That gap is worth roughly 163 fewer late arrivals for every thousand flights.
Key figures
On time
93.6%
Arrivals under 15 minutes late, of 249 completed flights
Avg delay
216 min
Across delayed arrivals only, not all flights
Cancelled
0.79%
National rate is 1.89%
1 hour+ late
4.4%
National rate is 8.3%
These figures cover 252 flights between September 2025 and August 2026. The median arrival is 11 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 6401 flies
OO 6401 flies MFR to PHX without a single fixed slot. Its most common scheduled departure was 05:20, used on 88 of 252 flights, with 05:15 (75 flights) and 05:30 (33 flights) next.
- Departs 05:2088 flights34.9%
- Departs 05:1575 flights29.8%
- Departs 05:3033 flights13.1%
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 05:20 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 6401 runs 4 points better at 93.6%. 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 6401 next to MFR to PHX
Every carrier on MFR to PHX combined arrived on time 84.4% of the time across 754 flights, so OO 6401 is 9 points ahead of it. SkyWest flew 516 flights on the same city pair under all its flight numbers, including this one, and those ran 83.4% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 6401thin sample | 252 | 93.6% | 216 min | 0.79% | A+ |
| All SkyWest Airlines on MFR–PHX | 516 | 83.4% | 94 min | 0.39% | B+ |
| All carriers on MFR–PHX | 754 | 84.4% | 87 min | 0.66% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 6401 quarter by quarter
OO 6401 did not run the same all year. Its best quarter was Apr–Jun 2026 at 98.9% on time and its weakest Jan–Mar 2026 at 88.5%, a swing of 10 points on roughly 63 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 flights96.7%
- Oct–Dec 202518 flights—
- Jan–Mar 202652 flights88.5%
- Apr–Jun 202690 flights98.9%
- Jul–Sep 202662 flights91.7%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 6401 ranged from 88.6% on Wednesday to 97.2% on Monday. With about 36 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 6401 runs when it is late
OO 6401 often beats the schedule: 92 of 249 completed flights, 37%, arrived 15 minutes or more early. When OO 6401 is late it tends to be very late: 11 of its 16 late arrivals were an hour or more behind, and 9 were two hours or more.
- 15+ min early92 flights36.9%
- Within 15 min141 flights56.6%
- 15–29 min late5 flights2.0%
- 30–59 min late0 flights0.0%
- 1–2 hours late2 flights0.8%
- 2+ hours late9 flights3.6%
Scale runs 0% to 100%.
Share of 249 completed flights by arrival against schedule.
Only 14 of 249 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 6401
The latest arrival of the period was on 28 April 2026, 11 hours 20 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 April 2026 | 11 hours 20 minutes | Late-arriving aircraft |
| 2 January 2026 | 10 hours 11 minutes | Carrier |
| 22 March 2026 | 7 hours 3 minutes | Carrier |
| 14 February 2026 | 6 hours 44 minutes | Carrier |
| 3 July 2026 | 4 hours 50 minutes | Carrier |
Delay causes
Why OO 6401 runs late
Carrier accounts for 74% of the 3,461 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Carrier
- 20%Late-arriving aircraft
- 4%Extreme weather
- 2%National Airspace System
The largest share of delay minutes, 74%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,564 of the 3,461 delay minutes reported here. The split is drawn from 3,461 delay minutes reported on OO 6401.
Cancellations are rare at 0.79%, 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
Badly late arrivals are rare here: only 4.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 855 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 252 flights under OO 6401 in the data flew MFR to PHX. 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. 252 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 6401
For a booking, OO 6401 has one of the better records a US domestic flight can show: 93.6% on time and 0.79% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- MFR to PHX, every carrier and departure
- PHX to MFR, the return direction
- Phoenix Sky Harbor International (PHX) 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.