Route reliability record
BOI→LAX
Boise to Los Angeles
- Flights
- 1,372
- Period
- July 2025 to June 2026
- Distance
- 674 mi
- Carriers
- 2
This route 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 1,372 BOI to LAX flights, with a median arrival 12 minutes early.
Best time to fly BOI to LAX: a 8am–11am departure, ideally on a Monday. Flights in that window arrived on time 96.7% of the time and Monday flights 94.9%, against 93.6% for the route overall.
Set against the rest of the country, this route's record is 16 points better than the US average of 77.6%. That gap is worth roughly 160 fewer late arrivals for every thousand flights.
Key figures
On time
93.6%
Arrivals under 15 minutes late, of 1,369 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
0.22%
National rate is 1.81%
Best carrier
SkyWest
94.0% on time across 1,341 flights
These figures cover 1,372 flights between July 2025 and June 2026. The median arrival is 12 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 BOI to LAX
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,341 | 94.0% | 74 min | 0.07% | A+ |
| Alaska Airlinesthin sample | 31 | 72.4% | 116 min | 6.45% | C− |
Flight by flight
Flights on BOI to LAX
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Departure window
The best time of day to leave
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,372 flights.
- 5am–8am499 flights91.8%
- 8am–11am420 flights96.7%
- 11am–2pm8 flights—
- 2pm–5pm393 flights92.6%
- 5pm–8pm52 flights92.3%
- 8pm–5am—
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 96.7% on time for the 8am–11am window against 91.8% for 5am–8am. Worth taking if the schedule allows, not worth an extra connection. The 5am–8am window is the busiest, with 499 flights scheduled in it.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 1,372 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
December is the weak month at 88.3% on time, against 98.4% in June. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. May was the busiest month here, with 138 flights.
The day of the week is close to irrelevant here: 3 points separates the best day from the worst. Weekly demand peaks are not what drives the delays on this operation.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 70% of the 6,883 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.
- 70%Carrier
- 16%Late-arriving aircraft
- 11%National Airspace System
- 3%Extreme weather
The largest share of delay minutes, 70%, 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 4,852 of the 6,883 delay minutes reported here. The split is drawn from 6,883 reported delay minutes.
Cancellations are rare at 0.22%, 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 stage length
What a delay here actually costs
Badly late arrivals are rare here: only 2.2% 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 674 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.
The return leg is a different operation and performs like one: it runs 89.9% on time across 1,373 flights, 4 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
The sample behind these figures is 1,372 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.
Work out the risk of missing a connection in LAX after this flight
What to do with this
Booking this route
Put together: this route's record is 93.6% on time with 0.22% cancelled, worth an A+. The largest single lever is the 8am–11am departure window, and the numbers below the table are where the reasoning behind that lives. 1,369 completed flights over 12 months sit behind that.
Common questions
BOI to LAX questions
How often is BOI to LAX delayed?
About one flight in fifteen arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 6.4% of the 1,372 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
How reliable is BOI to LAX compared with the rest of the country?
93.6% of flights arrive on time here against a national 77.6%, a difference of 16 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on BOI to LAX?
The 8am–11am departure window is the strongest at 96.7% on time. The 5am–8am window is the weakest at 91.8%, 5 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 December delays on BOI to LAX?
December is the weakest month at 88.3% on time, compared with 98.4% in June. Across the year that is 10 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- LAX to BOI — the return legseparate record
- Los Angeles International (LAX) delay statistics
- BOI to SEA, a related route85.7%
- SFO to LAX, a related route73.9%
- BOI to DEN, a related route80.9%
- SkyWest Airlines on-time record94.0%
- Alaska Airlines on-time record72.4%
- Worst months to fly in the US, ranked by the data
- The best time of day to fly, according to 7.04 million flight records
Direction matters. BOI to LAX and LAX to BOI are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.