Route on-time record

SLC to BOI: most on-time flights and the best time to fly

Salt Lake City (Salt Lake City International Airport) to Boise (Boise Air Terminal/Gowen Field). 1,742 nonstop flights in Jun 2025 to May 2026, 87% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was SkyWest 3594 at 4:05 PM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

SLC → BOI

Salt Lake City to Boise: 1,742 nonstop flights a year

On time (12 months)

87%

Cancelled

0.7%

avg delay 9 min

Best time to leave

3 to 6 PM

90% on time vs 83% after 9 PM

Most reliable airline

SkyWest

92% chance on time

Check SLC to BOI fares

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 3594 · sold as United Express, Delta Connection, American Eagle or Alaska
4:05 PM → 5:22 PM1h 17m nonstop
Local times, typical schedule. Last flown 2026-05-06. Same departure also flew as SkyWest 3508; its record covers all of them.
92%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 91% of the time (57 flights, Jun 2025 to May 2026).
- Never cancelled in 57 scheduled flights.
- Leaves in this route's most on-time window (3 to 6 PM: 90% on time; After 9 PM: 83%).
- Short track record (57 flights), so its score leans on the airline's record at this hour.
Limited track record · 57 flights
Find 4:05 PM flight fares Opens this date on Aviasales
#2 · SkyWest 3509 · sold as United Express, Delta Connection, American Eagle or Alaska
10:45 AM → 12:05 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-04-12.
92%
chance on time
On time (history)
94%
Cancelled
0.0%
Avg arrival delay
6 min
- Arrived on time 94% of the time (36 flights, Jun 2025 to May 2026).
- Never cancelled in 36 scheduled flights.
- Short track record (36 flights), so its score leans on the airline's record at this hour.
Limited track record · 36 flights
Find 10:45 AM flight fares Opens this date on Aviasales
#3 · SkyWest 4446 · sold as United Express, Delta Connection, American Eagle or Alaska
8:30 PM → 9:44 PM1h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
On time (history)
86%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 86% of the time (37 flights, Jun 2025 to May 2026).
- Never cancelled in 37 scheduled flights.
- Short track record (37 flights), so its score leans on the airline's record at this hour.
Limited track record · 37 flights
Find 8:30 PM flight fares Opens this date on Aviasales
#4 · Delta 412
9:00 PM → 10:11 PM1h 11m nonstop
Local times, typical schedule. Last flown 2026-04-12.
88%
chance on time
On time (history)
92%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 92% of the time (36 flights, Jun 2025 to May 2026).
- Never cancelled in 36 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 83% on time; 3 to 6 PM: 90%).
- Short track record (36 flights), so its score leans on the airline's record at this hour.
Limited track record · 36 flights
Find Delta 412 fares Opens this date on Aviasales
#5 · Delta 2920
4:35 PM → 5:50 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 88% of the time (25 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (3 to 6 PM: 90% on time; After 9 PM: 83%).
- Short track record (25 flights), so its score leans on the airline's record at this hour.
Limited track record · 25 flights
Find Delta 2920 fares Opens this date on Aviasales
#6 · Delta 1744
8:40 AM → 9:53 AM1h 17m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
On time (history)
88%
Cancelled
1.5%
Avg arrival delay
8 min
- Arrived on time 88% of the time (321 flights, Jun 2025 to May 2026).
Strong track record · 321 flights
Find Delta 1744 fares Opens this date on Aviasales
#7 · Delta 1224
8:45 PM → 9:56 PM1h 11m nonstop
Local times, typical schedule. Last flown 2026-05-05.
83%
chance on time
On time (history)
78%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 78% of the time (23 flights, Jun 2025 to May 2026).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Delta 1224 fares Opens this date on Aviasales
#8 · Delta 2095
10:50 AM → 12:02 PM1h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
On time (history)
82%
Cancelled
0.9%
Avg arrival delay
11 min
- Arrived on time 82% of the time (319 flights, Jun 2025 to May 2026).
Strong track record · 319 flights
Find Delta 2095 fares Opens this date on Aviasales
#9 · Delta 2111
10:45 PM → 11:59 PM1h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
On time (history)
81%
Cancelled
0.9%
Avg arrival delay
14 min
- Arrived on time 81% of the time (344 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (After 9 PM: 83% on time; 3 to 6 PM: 90%).
Strong track record · 344 flights
Find Delta 2111 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)92%
508 flights · 93% on time as flown · 0.3% cancel
Delta Air Lines83%
1,234 flights · 84% on time as flown · 0.9% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM90%
300 flights · avg delay 7 min
9 AM to noon84%
423 flights · avg delay 11 min
3 to 6 PM90%
391 flights · avg delay 6 min
6 to 9 PM89%
225 flights · avg delay 5 min
After 9 PM83%
403 flights · avg delay 12 min

Best day: Tuesday (90%). 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)69%
Late-arriving aircraft16%
Air traffic control and airport volume8%
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

Finding the most reliable connections from SLC to BOI…

SLC to BOI questions

What time of day is best to fly SLC to BOI?: 3 to 6 PM: 90% of flights arrived on time, against 83% for departures after 9 PM.
Which airline is most on time from SLC to BOI?: SkyWest, with a season-adjusted 92% chance of operating and arriving on time over 508 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 SLC to BOI?: January (80% on time); the best was November (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.

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