Route reliability record
BOI→LAX
Boise to Los Angeles
- Flights
- 1,353
- Period
- September 2025 to August 2026
- Distance
- 674 mi
- Carriers
- 2
This route 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 a little over an hour. That rests on 1,353 BOI to LAX flights, with a median arrival 11 minutes early.
Best time to fly BOI to LAX: a 8am–11am departure, ideally on a Monday. Flights in that window arrived on time 95.3% of the time and Monday flights 94.9%, against 92.7% for the route overall.
Set against the rest of the country, this route's record is 15 points better than the US average of 77.3%. That gap is worth roughly 154 fewer late arrivals for every thousand flights.
Key figures
On time
92.7%
Arrivals under 15 minutes late, of 1,350 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
0.22%
National rate is 1.89%
Best carrier
SkyWest
93.1% on time across 1,322 flights
These figures cover 1,353 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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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 | 1,322 | 93.1% | 68 min | 0.08% | 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.
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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 1,353 flights.
- 5am–8am574 flights92.0%
- 8am–11am385 flights95.3%
- 11am–2pm—
- 2pm–5pm334 flights90.7%
- 5pm–8pm60 flights93.3%
- 8pm–5am—
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 95.3% on time for the 8am–11am window against 90.7% for 2pm–5pm. Worth taking if the schedule allows, not worth an extra connection. The 5am–8am window is the busiest, with 574 flights scheduled in it.
Explore
Filter BOI to LAX by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On BOI to LAX, the best departure window is 8am–11am at 95.3% on time and the worst is 2pm–5pm at 90.7%, a narrow gap of 4.6 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am92.0%
- 8–11am95.3%
- 11am–2pm—
- 2–5pm90.7%
- 5–8pm93.3%
- 8pm–5am—
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 1,353 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.
Across the week, Monday is the strongest day at 94.9% on time and Sunday the weakest at 90.8%, a spread of 4 points.
Delay causes
Why this route gets delayed
Carrier accounts for 69% of the 7,151 delay minutes carriers reported here, and the remaining four split what is left.
- 69%Carrier
- 15%Late-arriving aircraft
- 9%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,917 of the 7,151 delay minutes reported here. The split is drawn from 7,151 reported delay minutes.
Cancellations are rare at 0.22%, 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 stage length
What a delay here actually costs
Badly late arrivals are rare here: only 2.4% 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 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.
The return leg runs 89.8% on time across 1,356 flights, within 3 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 1,353 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 92.7% 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. 1,350 completed flights over 12 months sit behind that.
Common questions
BOI to LAX questions
How often is BOI to LAX delayed?
Roughly 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 7.3% of the 1,353 flights in this analysis, against 22.7% 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?
92.7% of flights arrive on time here against a national 77.3%, a difference of 15 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 95.3% on time. The 2pm–5pm window is the weakest at 90.7%, 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 route84.9%
- SFO to LAX, a related route70.9%
- BOI to DEN, a related route81.7%
- SkyWest Airlines on-time record93.1%
- Alaska Airlines on-time record72.4%
- The most punctual routes in the US, and the least
- Worst months to fly in the US, ranked by the data
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.