Flight number record

OO 6401

SkyWest Airlines · Medford to Phoenix

Route: MFR → PHX
Departs: 05:30
Flights: 251
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 18 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 4.1 hours. That rests on 251 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 6401's record is 18 points better than the US average of 77.6%. That gap is worth roughly 176 fewer late arrivals for every thousand flights.

On time

95.2%

Arrivals under 15 minutes late, of 250 completed flights

Avg delay

245 min

Across delayed arrivals only, not all flights

Cancelled

0.40%

National rate is 1.81%

1 hour+ late

3.2%

National rate is 8.1%

These figures cover 251 flights between July 2025 and June 2026. The median arrival is 13 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 6401 flies

OO 6401 flies MFR to PHX without a single fixed slot. Its most common scheduled departure was 05:30, used on 65 of 251 flights, with 05:20 (61 flights) and 05:15 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:3065 flights25.9%
Departs 05:2061 flights24.3%
Departs 05:1540 flights15.9%

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 05:30 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 6 points better at 95.2%. 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 6401 next to MFR to PHX

Every carrier on MFR to PHX combined arrived on time 86.8% of the time across 753 flights, so OO 6401 is 8 points ahead of it. SkyWest flew 515 flights on the same city pair under all its flight numbers, including this one, and those ran 87.0% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 6401 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 6401thin sample	251	95.2%	245 min	0.40%	A+
All SkyWest Airlines on MFR–PHX	515	87.0%	100 min	0.19%	A+
All carriers on MFR–PHX	753	86.8%	89 min	0.53%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 84 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 202591 flights97.8%
Oct–Dec 202518 flights—
Jan–Mar 202652 flights88.5%
Apr–Jun 202690 flights98.9%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 6401 ranged from 91.4% on Wednesday to 97.2% on Monday. With about 36 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 6401 runs late

One category carries most of the weight here. Carrier accounts for 69% of the 2,938 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%
Late-arriving aircraft
23%
Extreme weather
5%
National Airspace System
2%

The largest share of delay minutes, 69%, 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 2,035 of the 2,938 delay minutes reported here. The split is drawn from 2,938 delay minutes reported on OO 6401.

Cancellations are rare at 0.40%, 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

Badly late arrivals are rare here: only 3.2% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 251 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. 251 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: 95.2% on time and 0.40% cancelled. That is a base rate, not a promise about any single 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