Route reliability record
LAX→BOI
Los Angeles to Boise
- Flights
- 1,356
- 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 13 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 1,356 LAX to BOI flights, with a median arrival 15 minutes early.
Best time to fly LAX to BOI: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 91.1% of the time and Tuesday flights 93.7%, against 89.8% for the route overall.
Set against the rest of the country, this route's record is 13 points better than the US average of 77.3%. That gap is worth roughly 125 fewer late arrivals for every thousand flights.
Key figures
On time
89.8%
Arrivals under 15 minutes late, of 1,353 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
0.07%
National rate is 1.89%
Best carrier
SkyWest
89.7% on time across 1,325 flights
These figures cover 1,356 flights between September 2025 and August 2026. The median arrival is 15 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 LAX to BOI
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 |
|---|---|---|---|---|---|
| Alaska Airlinesthin sample | 31 | 93.5% | 109 min | 0.00% | A+ |
| SkyWest Airlines | 1,325 | 89.7% | 74 min | 0.08% | A+ |
Flight by flight
Flights on LAX to BOI
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 1,356 flights.
- 5am–8am90 flights91.1%
- 8am–11am121 flights87.5%
- 11am–2pm247 flights91.1%
- 2pm–5pm45 flights91.1%
- 5pm–8pm662 flights89.6%
- 8pm–5am191 flights89.5%
Scale runs 80% to 95%.
The time of day barely matters here. The 5am–8am window tops the set at 91.1% and 8am–11am sits at 87.5%, 4 points apart across 1,356 flights. Pick the departure that suits the trip: whatever is going wrong here is not accumulating over the course of the day. The 5pm–8pm window is the busiest, with 662 flights scheduled in it.
Explore
Filter LAX to BOI 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 LAX to BOI, the best departure window is 5am–8am at 91.1% on time and the worst is 8am–11am at 87.5%, a narrow gap of 3.6 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am91.1%
- 8–11am87.5%
- 11am–2pm91.1%
- 2–5pm91.1%
- 5–8pm89.6%
- 8pm–5am89.5%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 13 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
February is the weak month at 82.1% on time, against 95.4% in April. 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 139 flights.
Across the week, Tuesday is the strongest day at 93.7% on time and Friday the weakest at 82.1%, a spread of 12 points.
Delay causes
Why this route gets delayed
Carrier accounts for 59% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 23%Late-arriving aircraft
- 9%National Airspace System
- 8%Extreme weather
- 1%Security
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,050 of the 10,000 delay minutes reported here. The split is drawn from 10,270 reported delay minutes.
Cancellations are rare at 0.07%, 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
5.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
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 92.7% on time across 1,353 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 1,356 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 BOI after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 95.4% on time and February 82.1%, a swing of 13 points. If the dates move at all, move them out of February before you think about anything else. 1,353 completed flights over 12 months sit behind that.
Common questions
LAX to BOI questions
How often is LAX to BOI delayed?
About one flight in ten arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 10.2% of the 1,356 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is LAX to BOI compared with the rest of the country?
89.8% of flights arrive on time here against a national 77.3%, a difference of 13 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on LAX to BOI?
The 5am–8am departure window is the strongest at 91.1% on time. The 8am–11am window is the weakest at 87.5%, 4 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 February delays on LAX to BOI?
February is the weakest month at 82.1% on time, compared with 95.4% in April. Across the year that is 13 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
- BOI to LAX — the return legseparate record
- Los Angeles International (LAX) delay statistics
- LAX to SFO, a related route60.1%
- SEA to BOI, a related route86.3%
- LAX to JFK, a related route77.5%
- Alaska Airlines on-time record93.5%
- SkyWest Airlines on-time record89.7%
- The most punctual routes in the US, and the least
- Worst months to fly in the US, ranked by the data
Direction matters. LAX to BOI and BOI to LAX 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.