Boise (BOI) to Phoenix (PHX): On-Time Performance
Data through May 2026
When you fly BOI to PHX matters as much as anything else about the booking: the route swung from 92% on-time in March 2026 to just 73% in August 2024. Across the full period the route averages 84% on-time against a national 78%. Morning departures also hold up better than evening ones (93% vs 71%), which matters most in the rough months.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.3%
- Flights/day
- 5.4
- last 12 months
- Duration
- 2h 12m
- scheduled
- Distance
- 735 mi
Best airline from BOI to PHX
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 86% | 8 min | 0.3% | 1,594 |
| Envoy Air | 84% | 8 min | 0.0% | 177 |
| SkyWest Airlines | 83% | 14 min | 0.4% | 1,983 |
| American Airlines | 81% | 23 min | 0.0% | 165 |
Monthly on-time trend
Best time to fly from BOI to PHX
Aim for departures around 5 a.m. (99% on-time); avoid 7 p.m. departures (57%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 82% | 13 min |
| Tuesday | 88% | 12 min |
| Wednesday | 86% | 9 min |
| Thursday | 82% | 11 min |
| Friday | 80% | 19 min |
| Saturdaybest | 89% | 8 min |
| Sunday | 85% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations48%
- National airspace system11%
- Weather5%
Frequently asked questions
- How often are flights from BOI to PHX delayed?
- 16% of BOI–PHX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from BOI to PHX?
- Southwest Airlines has the best on-time record on this route at 86%, based on 1,594 flights. 4 airlines flew BOI–PHX frequently enough to compare in this period.
- What is the best time of day to fly from BOI to PHX?
- Departures around 5 a.m. have the best record (99% on-time), while departures around 7 p.m. have the worst (57%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOI to PHX?
- The scheduled BOI–PHX flight time averages 2h 12m over 735 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are BOI to PHX flights cancelled?
- 0.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from BOI to PHX?
- August 2024 was the roughest month in this dataset, with only 73% of arrivals on time. The best was March 2026 at 92%. If your dates are flexible, that 19-point gap is worth planning around.
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Based on 3,925 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.