Route on-time record
BOI to SEA: most on-time flights and the best time to fly
Boise (Boise Air Terminal/Gowen Field) to Seattle (Seattle–Tacoma International Airport). 3,847 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 0.4% were cancelled. The most reliable flight number was SkyWest 3775 at 5:52 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
BOI → SEA
Boise to Seattle: 3,847 nonstop flights a year
On time (12 months)
86%
Cancelled
0.4%
avg delay 9 min
Best time to leave
Before 9 AM
93% on time vs 78% 6 to 9 PM
Most reliable airline
SkyWest
86% chance on time
Lowest nonstop fare seen in the next two months: $126 (Alaska 2120 on 2026-11-18). 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 3775 · sold as United Express, Delta Connection, American Eagle or Alaska
5:52 AM → 6:40 AM1h 48m nonstop
Local times, typical schedule. Last flown 2026-05-31.
96%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 96% of the time (360 flights, Jun 2025 to May 2026).
- Never cancelled in 361 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 78%).
Strong track record · 360 flights
Find 5:52 AM flight fares Opens this date on Aviasales#2 · SkyWest 3678 · sold as United Express, Delta Connection, American Eagle or Alaska
7:30 AM → 8:15 AM1h 47m nonstop
Local times, typical schedule. Last flown 2026-05-06.
93%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 93% of the time (338 flights, Jun 2025 to May 2026).
- Never cancelled in 340 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 78%).
Strong track record · 338 flights
Find 7:30 AM flight fares Opens this date on Aviasales#3 · SkyWest 3065 · sold as United Express, Delta Connection, American Eagle or Alaska
8:20 AM → 9:04 AM1h 44m nonstop
Local times, typical schedule. Last flown 2026-04-21.
92%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 97% 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: 93% on time; 6 to 9 PM: 78%).
- Short track record (35 flights), so its score leans on the airline's record at this hour.
Limited track record · 35 flights
Find 8:20 AM flight fares Opens this date on Aviasales#4 · SkyWest 3042 · sold as United Express, Delta Connection, American Eagle or Alaska
8:30 AM → 9:18 AM1h 48m nonstop
Local times, typical schedule. Last flown 2026-03-17.
91%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 97% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 78%).
- Short track record (33 flights), so its score leans on the airline's record at this hour.
Limited track record · 33 flights
Find 8:30 AM flight fares Opens this date on Aviasales#5 · SkyWest 3066 · sold as United Express, Delta Connection, American Eagle or Alaska
11:58 AM → 12:40 PM1h 42m nonstop
Local times, typical schedule. Last flown 2026-04-21.
91%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 94% of the time (35 flights, Jun 2025 to May 2026).
- Never cancelled in 35 scheduled flights.
- Short track record (35 flights), so its score leans on the airline's record at this hour.
Limited track record · 35 flights
Find 11:58 AM flight fares Opens this date on Aviasales#6 · SkyWest 3817 · sold as United Express, Delta Connection, American Eagle or Alaska
12:15 PM → 12:55 PM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 3286; its record covers all of them.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 91% of the time (46 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- Short track record (46 flights), so its score leans on the airline's record at this hour.
Limited track record · 46 flights
Find 12:15 PM flight fares Opens this date on Aviasales#7 · SkyWest 3959 · sold as United Express, Delta Connection, American Eagle or Alaska
4:40 PM → 5:20 PM1h 42m nonstop
Local times, typical schedule. Last flown 2026-04-12.
89%
chance on time
- On time (history)
- 94%
- Cancelled
- 1.0%
- Avg arrival delay
- 5 min
- Arrived on time 94% of the time (104 flights, Jun 2025 to May 2026).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 104 flights
Find 4:40 PM flight fares Opens this date on Aviasales#8 · Alaska 1329
1:00 PM → 1:45 PM1h 45m nonstop
Local times, typical schedule. Last flown 2026-03-17.
88%
chance on time
- On time (history)
- 100%
- Cancelled
- 5.9%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (16 flights, Jun 2025 to May 2026).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Alaska 1329 fares Opens this date on Aviasales#9 · Alaska 474
6:00 AM → 6:40 AM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 345; its record covers all of them.
88%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.9%
- Avg arrival delay
- 5 min
- Arrived on time 90% of the time (233 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 78%).
Strong track record · 233 flights
Find Alaska 474 fares Opens this date on Aviasales#10 · Alaska 231
2:22 PM → 3:00 PM1h 38m nonstop
Local times, typical schedule. Last flown 2026-04-21.
88%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 94% of the time (34 flights, Jun 2025 to May 2026).
- Never cancelled in 34 scheduled flights.
- Short track record (34 flights), so its score leans on the airline's record at this hour.
Limited track record · 34 flights
Find Alaska 231 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%
2,986 flights · 86% on time as flown · 0.3% cancel
- Alaska Airlines84%
861 flights · 85% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM93%
1,315 flights · avg delay 5 min
- 9 AM to noon85%
732 flights · avg delay 11 min
- Noon to 3 PM87%
571 flights · avg delay 8 min
- 3 to 6 PM80%
649 flights · avg delay 10 min
- 6 to 9 PM78%
559 flights · avg delay 12 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
- Airline (crew, maintenance, boarding)51%
- Air traffic control and airport volume20%
- Late-arriving aircraft16%
- 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
BOI to SEA questions
- What time of day is best to fly BOI to SEA?
- Before 9 AM: 93% of flights arrived on time, against 78% 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 SEA?
- SkyWest, with a season-adjusted 86% chance of operating and arriving on time over 2,986 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 SEA?
- January (78% on time); the best was March (89%), 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
- SEA to BOI (return)
- BOI to DEN 81%
- BOI to PHX 84%
- 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