Route on-time record
SEA to BOI: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Boise (Boise Air Terminal/Gowen Field). 4,028 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was SkyWest 3750 at 7:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → BOI
Seattle to Boise: 4,028 nonstop flights a year
On time (12 months)
85%
Cancelled
0.3%
avg delay 9 min
Best time to leave
Before 9 AM
92% on time vs 82% 6 to 9 PM
Most reliable airline
SkyWest
86% chance on time
Lowest nonstop fare seen in the next two months: $308 (Alaska 2169 on 2026-10-21). 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 · SkyWest 3750 · sold as United Express, Delta Connection, American Eagle or Alaska
7:15 AM → 9:54 AM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 3376, 3256; its record covers all of them.
93%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 94% of the time (284 flights, Jun 2025 to May 2026).
- Never cancelled in 284 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 82%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 284 flights
Find 7:15 AM flight fares Opens this date on Aviasales#2 · SkyWest 3067 · sold as United Express, Delta Connection, American Eagle or Alaska
7:49 AM → 10:21 AM1h 32m nonstop
Local times, typical schedule. Last flown 2026-04-21.
89%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 89% of the time (35 flights, Jun 2025 to May 2026).
- Never cancelled in 35 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 82%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Limited track record · 35 flights
Find 7:49 AM flight fares Opens this date on Aviasales#3 · Alaska 248
8:26 AM → 11:03 AM1h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 94% of the time (18 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 82%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find Alaska 248 fares Opens this date on Aviasales#4 · SkyWest 4127 · sold as United Express, Delta Connection, American Eagle or Alaska
10:35 AM → 1:05 PM1h 36m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 8 min
- Arrived on time 88% of the time (364 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 364 flights
Find 10:35 AM flight fares Opens this date on Aviasales#5 · SkyWest 3692 · sold as United Express, Delta Connection, American Eagle or Alaska
6:30 PM → 9:01 PM1h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (345 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 82% on time; Before 9 AM: 92%).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 345 flights
Find 6:30 PM flight fares Opens this date on Aviasales#6 · SkyWest 4090 · sold as United Express, Delta Connection, American Eagle or Alaska
9:20 PM → 12:17 AM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.7%
- Avg arrival delay
- 8 min
- Arrived on time 89% of the time (139 flights, Jun 2025 to May 2026).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 139 flights
Find 9:20 PM flight fares Opens this date on Aviasales#7 · SkyWest 3688 · sold as United Express, Delta Connection, American Eagle or Alaska
4:10 PM → 6:43 PM1h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.3%
- Avg arrival delay
- 8 min
- Arrived on time 87% of the time (360 flights, Jun 2025 to May 2026).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 360 flights
Find 4:10 PM flight fares Opens this date on Aviasales#8 · SkyWest 3817 · sold as United Express, Delta Connection, American Eagle or Alaska
7:31 PM → 10:04 PM1h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 3959; its record covers all of them.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.3%
- Avg arrival delay
- 8 min
- Arrived on time 87% of the time (351 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 82% on time; Before 9 AM: 92%).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 351 flights
Find 7:31 PM flight fares Opens this date on Aviasales#9 · SkyWest 3385 · sold as United Express, Delta Connection, American Eagle or Alaska
11:29 AM → 1:58 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-12.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 89% of the time (141 flights, Jun 2025 to May 2026).
- Never cancelled in 141 scheduled flights.
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 141 flights
Find 11:29 AM flight fares Opens this date on Aviasales#10 · SkyWest 3493 · sold as United Express, Delta Connection, American Eagle or Alaska
10:25 AM → 1:02 PM1h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 84% of the time (19 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find 10:25 AM 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)86%
3,168 flights · 86% on time as flown · 0.2% cancel
- Alaska Airlines79%
860 flights · 80% on time as flown · 0.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
573 flights · avg delay 5 min
- 9 AM to noon85%
716 flights · avg delay 9 min
- Noon to 3 PM83%
922 flights · avg delay 9 min
- 3 to 6 PM86%
671 flights · avg delay 8 min
- 6 to 9 PM82%
782 flights · avg delay 10 min
- After 9 PM83%
364 flights · avg delay 12 min
Best day: Tuesday (87%). Worst: Thursday (81%).
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
- Airline (crew, maintenance, boarding)47%
- Late-arriving aircraft25%
- Air traffic control and airport volume14%
- Severe weather13%
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
SEA to BOI questions
- What time of day is best to fly SEA to BOI?
- Before 9 AM: 92% of flights arrived on time, against 82% 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 SEA to BOI?
- SkyWest, with a season-adjusted 86% chance of operating and arriving on time over 3,168 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 SEA to BOI?
- June (78% on time); the best was October (91%), 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 SEA
- BOI to SEA (return)
- SEA to LAX 83%
- SEA to PHX 79%
- SEA to SFO 69%
- SEA to ANC 74%
- SEA to DEN 77%
- SEA to LAS 77%
- SEA to ORD 75%
- SEA to GEG 81%
- SEA to DFW 77%
- SEA to PDX 82%
- SEA to SAN 78%
- SEA to SMF 81%
Live status: FAA delays and ground stops