Route on-time record
BOI to PHX: most on-time flights and the best time to fly
Boise (Boise Air Terminal/Gowen Field) to Phoenix (Phoenix Sky Harbor International Airport). 1,965 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 4629 at 5:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
BOI → PHX
Boise to Phoenix: 1,965 nonstop flights a year
On time (12 months)
84%
Cancelled
0.5%
avg delay 12 min
Best time to leave
Before 9 AM
95% on time vs 72% 6 to 9 PM
Most reliable airline
SkyWest
85% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 4629
5:30 AM → 6:35 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2865; its record covers all of them.
96%
chance on time
- On time (history)
- 100%
- Cancelled
- 1.8%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (55 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 4629 fares Opens this date on Aviasales#2 · SkyWest 4920 · sold as United Express, Delta Connection, American Eagle or Alaska
6:45 AM → 8:05 AM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-20.
96%
chance on time
- On time (history)
- 98%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 98% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
- Short track record (44 flights), so its score leans on the airline's record at this hour.
Limited track record · 44 flights
Find 6:45 AM flight fares Opens this date on Aviasales#3 · Southwest 4252
6:05 AM → 7:15 AM2h 10m nonstop
Local times, typical schedule. Last flown 2026-04-01.
94%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 4252 fares Opens this date on Aviasales#4 · SkyWest 6450 · sold as United Express, Delta Connection, American Eagle or Alaska
6:38 AM → 8:04 AM2h 26m nonstop
Local times, typical schedule. Last flown 2026-04-06.
94%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 94% of the time (216 flights, Jun 2025 to May 2026).
- Never cancelled in 216 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
Strong track record · 216 flights
Find 6:38 AM flight fares Opens this date on Aviasales#5 · Southwest 3190
6:40 AM → 7:45 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 94% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 3190 fares Opens this date on Aviasales#6 · SkyWest 3250 · sold as United Express, Delta Connection, American Eagle or Alaska
7:15 AM → 8:37 AM2h 22m nonstop
Local times, typical schedule. Last flown 2026-03-15.
89%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 94% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find 7:15 AM flight fares Opens this date on Aviasales#7 · SkyWest 6475 · sold as United Express, Delta Connection, American Eagle or Alaska
8:11 AM → 9:29 AM2h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 72%).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find 8:11 AM flight fares Opens this date on Aviasales#8 · SkyWest 6219 · sold as United Express, Delta Connection, American Eagle or Alaska
12:31 PM → 1:53 PM2h 22m nonstop
Local times, typical schedule. Last flown 2026-04-06.
87%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 90% of the time (50 flights, Jun 2025 to May 2026).
- Never cancelled in 50 scheduled flights.
- Short track record (50 flights), so its score leans on the airline's record at this hour.
Limited track record · 50 flights
Find 12:31 PM flight fares Opens this date on Aviasales#9 · SkyWest 6280 · sold as United Express, Delta Connection, American Eagle or Alaska
6:33 PM → 7:54 PM2h 21m nonstop
Local times, typical schedule. Last flown 2026-04-06.
81%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.4%
- Avg arrival delay
- 10 min
- Arrived on time 81% of the time (220 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 72% on time; Before 9 AM: 95%).
- Lands inside PHX's trouble window: 43% of its 46 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 220 flights
Find 6:33 PM flight fares Opens this date on Aviasales#10 · SkyWest 4934 · sold as United Express, Delta Connection, American Eagle or Alaska
5:40 PM → 7:00 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 22 min
- Arrived on time 90% of the time (10 flights, Jun 2025 to May 2026).
- Lands inside PHX's trouble window: 43% of its 46 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (10 flights), so its score leans on the airline's record at this hour.
Limited track record · 10 flights
Find 5:40 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)85%
1,005 flights · 86% on time as flown · 0.7% cancel
- Southwest Airlines83%
814 flights · 83% on time as flown · 0.4% cancel
- Envoy Air (sold as American Eagle)81%
89 flights · 79% on time as flown · 0.3% cancel
- American Airlines79%
52 flights · 73% on time as flown · 0.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
783 flights · avg delay 5 min
- Noon to 3 PM80%
506 flights · avg delay 15 min
- 3 to 6 PM74%
494 flights · avg delay 14 min
- 6 to 9 PM72%
146 flights · avg delay 27 min
Best day: Saturday (88%). Worst: Friday (82%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft41%
- Airline (crew, maintenance, boarding)38%
- Air traffic control and airport volume13%
- Severe weather7%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
BOI to PHX questions
- What time of day is best to fly BOI to PHX?
- Before 9 AM: 95% of flights arrived on time, against 72% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from BOI to PHX?
- SkyWest, with a season-adjusted 85% chance of operating and arriving on time over 1,005 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on BOI to PHX?
- August (79% on time); the best was July (87%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from BOI
- PHX to BOI (return)
- BOI to SEA 86%
- BOI to DEN 81%
- BOI to SLC 92%
- BOI to SFO 75%
- BOI to LAS 82%
- BOI to LAX 93%
- BOI to PDX 91%
- BOI to ORD 76%
- BOI to SAN 83%
- BOI to SMF 84%
- BOI to DFW 82%
- BOI to MSP 88%
Live status: FAA delays and ground stops