Route reliability record
LAX→BOI
Los Angeles to Boise
- Flights
- 1,373
- Period
- July 2025 to June 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 12 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 1,373 LAX to BOI flights, with a median arrival 15 minutes early.
Best time to fly LAX to BOI: a 11am–2pm departure, ideally on a Tuesday. Flights in that window arrived on time 91.5% of the time and Tuesday flights 94.4%, against 89.9% for the route overall.
Set against the rest of the country, this route's record is 12 points better than the US average of 77.6%. That gap is worth roughly 123 fewer late arrivals for every thousand flights.
Key figures
On time
89.9%
Arrivals under 15 minutes late, of 1,370 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.07%
National rate is 1.81%
Best carrier
SkyWest
89.8% on time across 1,342 flights
These figures cover 1,373 flights between July 2025 and June 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.
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 | 1,342 | 89.8% | 69 min | 0.07% | 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.
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 1,373 flights.
- 5am–8am41 flights87.8%
- 8am–11am142 flights88.7%
- 11am–2pm285 flights91.5%
- 2pm–5pm44 flights90.9%
- 5pm–8pm639 flights89.7%
- 8pm–5am222 flights89.2%
Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.
The time of day barely matters here. The 11am–2pm window tops the set at 91.5% and 5am–8am sits at 87.8%, 4 points apart across 1,373 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 639 flights scheduled in it.
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 94.4% on time and Friday the weakest at 81.1%. 13 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. Carrier accounts for 52% of the 9,673 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.
- 52%Carrier
- 27%Late-arriving aircraft
- 11%National Airspace System
- 9%Extreme weather
- 1%Security
The largest share of delay minutes, 52%, 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 5,076 of the 9,673 delay minutes reported here. The split is drawn from 9,673 reported delay minutes.
Cancellations are rare at 0.07%, 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
5.1% of arrivals land an hour or more late, close to the national 8.1%. 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 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. 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 93.6% on time across 1,372 flights, 4 points above 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 1,373 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. 1,370 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 10.1% of the 1,373 flights in this analysis, against 22.4% 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?
89.9% of flights arrive on time here against a national 77.6%, a difference of 12 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 11am–2pm departure window is the strongest at 91.5% on time. The 5am–8am window is the weakest at 87.8%, 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 route64.8%
- SEA to BOI, a related route85.8%
- LAX to JFK, a related route79.1%
- Alaska Airlines on-time record93.5%
- SkyWest Airlines on-time record89.8%
- 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. 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.
Embed LAX to BOI’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.