Route reliability record

LAX→PHX

Los Angeles to Phoenix

Flights: 7,608
Period: June 2025 to May 2026
Distance: 370 mi
Carriers: 7

This route lands a B+, 4 points better than the national rate of 77.4%. About one flight in five arrive 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 7,608 flights, of which SkyWest Airlines flew 2,579 at 87.0% on time.

SkyWest Airlines is the most reliable of the four carriers covered here at 87.0% on time across 2,579 flights.

On time

81.2%

Arrivals under 15 minutes late, of 7,542 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

0.79%

National rate is 1.80%

Best carrier

SkyWest

87.0% on time across 2,579 flights

These figures cover 7,608 flights between June 2025 and May 2026. The median arrival is 6 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.

Carrier by carrier

Which airline is most reliable on LAX to PHX

The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 87.0% of the time; Frontier Airlines manages 73.8%. Sample sizes sit next to every figure, because a two-point gap across 481 flights means less than a ten-point one.

On-time performance by carrier on LAX to PHX
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines	2,579	87.0%	58 min	0.74%	A+
United Airlinesthin sample	348	85.3%	73 min	0.57%	A+
Delta Air Linesthin sample	138	83.2%	78 min	0.72%	B+
Envoy Airthin sample	10	80.0%	24 min	0.00%	B+
American Airlines	2,020	79.7%	91 min	0.50%	B+
Southwest Airlines	2,032	76.4%	49 min	1.03%	B
Frontier Airlines	481	73.8%	69 min	1.46%	C

The spread between SkyWest and Frontier is 13 points, wide enough that it should decide the booking. On a hundred trips that is 13 more arrivals inside the on-time window.

Departure window

The best time of day to leave

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 14 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am988 flights89.6%
8am–11am1,698 flights85.9%
11am–2pm1,024 flights80.0%
2pm–5pm1,366 flights76.3%
5pm–8pm1,168 flights75.4%
8pm–5am1,364 flights80.3%

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

Book the early departure. Flights leaving between 5am–8am arrive on time 89.6% of the time, against 75.4% for the evening window. That is 14 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on.

Across the year

When delays peak on this route

Twelve months, one bar each, drawn from the same 7,608 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.

Darker means more delays. Figures are on-time percentages.August best, November worst

Delays peak in November, when the on-time rate falls to 75.6%. August is the strongest month at 83.9%. Moving a flexible trip across that boundary buys 8 points.

Across the week, Tuesday is the strongest day at 86.5% on time and Friday the weakest at 76.6%. 10 points is a smaller lever than departure hour, but it is free.

Delay causes

Why this route gets delayed

One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 94,000 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.

Late-arriving aircraft
49%
Carrier
35%
National Airspace System
14%
Extreme weather
3%
Security
0%

49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 94,000 reported delay minutes here, that single category outweighs weather by 18 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit.

The largest share of delay minutes, 35%, 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 33,000 of the 94,000 delay minutes reported here.

Cancellations are rare at 0.79%, below the national 1.80% 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 stage length

What a delay here actually costs

6.1% of arrivals land an hour or more late, close to the national 8.2%. 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 are the about an hour kind, which a normal layover absorbs.

At 370 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.

The return leg runs 83.3% on time across 7,608 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

The sample behind these figures is 7,608 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

What to do with this

Booking this route

Put together: avoid the 5pm–8pm departure. It runs 75.4% on time against 89.6% for the 5am–8am slot, and that 14 points is the largest single thing you control here. SkyWest Airlines is the strongest operator if the fares are close.

Common questions

LAX to PHX questions

How often is LAX to PHX delayed?

About one flight in five arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 18.8% of the 7,608 flights in this analysis, against 22.6% nationally. Delayed flights are late by about an hour on average.

Which airline is most reliable on LAX to PHX?

SkyWest Airlines leads at 87.0% on time across 2,579 flights. Frontier Airlines is at the other end on 73.8%, a gap of 13 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on LAX to PHX?

The 5am–8am departure window is the strongest at 89.6% on time. The 5pm–8pm window is the weakest at 75.4%, 14 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.

How bad are November delays on LAX to PHX?

November is the weakest month at 75.6% on time, compared with 83.9% in August. Across the year that is 8 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. LAX to PHX and PHX to LAX are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.

Key figures