Route on-time record

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

Denver (Denver International Airport) to Boise (Boise Air Terminal/Gowen Field). 3,040 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.2% were cancelled. The most reliable flight number was SkyWest 5788 at 7:45 AM.

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

DEN → BOI

Denver to Boise: 3,040 nonstop flights a year

On time (12 months)

76%

Cancelled

0.2%

avg delay 15 min

Best time to leave

Before 9 AM

90% on time vs 58% after 9 PM

Most reliable airline

United

81% chance on time

Check DEN 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 5788 · sold as United Express, Delta Connection, American Eagle or Alaska
7:45 AM → 9:54 AM2h 09m nonstop
Local times, typical schedule. Last flown 2026-05-20.
92%
chance on time
On time (history)
94%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 94% of the time (77 flights, Jun 2025 to May 2026).
- Never cancelled in 77 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 58%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 77 flights
Find 7:45 AM flight fares Opens this date on Aviasales
#2 · United 1464
7:45 AM → 9:45 AM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
On time (history)
89%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 89% of the time (9 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 58%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find United 1464 fares Opens this date on Aviasales
#3 · United 2255
11:29 AM → 1:32 PM2h 02m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1125; its record covers all of them.
85%
chance on time
On time (history)
85%
Cancelled
0.0%
Avg arrival delay
10 min
- Arrived on time 85% of the time (364 flights, Jun 2025 to May 2026).
- Never cancelled in 365 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Strong track record · 364 flights
Find United 2255 fares Opens this date on Aviasales
#4 · SkyWest 5471 · sold as United Express, Delta Connection, American Eagle or Alaska
4:05 PM → 6:15 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-05-20.
80%
chance on time
On time (history)
90%
Cancelled
0.0%
Avg arrival delay
10 min
- Arrived on time 90% of the time (20 flights, Jun 2025 to May 2026).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- 83% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find 4:05 PM flight fares Opens this date on Aviasales
#5 · Frontier 3933
9:10 AM → 11:20 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
On time (history)
77%
Cancelled
0.0%
Avg arrival delay
12 min
- Arrived on time 77% of the time (121 flights, Jun 2025 to May 2026).
- Never cancelled in 121 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 121 flights
Find Frontier 3933 fares Opens this date on Aviasales
#6 · Southwest 1744
8:40 AM → 10:35 AM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1202; its record covers all of them.
76%
chance on time
On time (history)
76%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 76% of the time (87 flights, Jun 2025 to May 2026).
- Never cancelled in 87 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 58%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 87 flights
Find Southwest 1744 fares Opens this date on Aviasales
#7 · United 2602
3:55 PM → 5:56 PM2h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
On time (history)
68%
Cancelled
0.0%
Avg arrival delay
24 min
- Arrived on time 68% of the time (90 flights, Jun 2025 to May 2026).
- Never cancelled in 90 scheduled flights.
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 90 flights
Find United 2602 fares Opens this date on Aviasales
#8 · Southwest 3550
2:20 PM → 4:15 PM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-30.
76%
chance on time
On time (history)
100%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3550 fares Opens this date on Aviasales
#9 · SkyWest 6045 · sold as United Express, Delta Connection, American Eagle or Alaska
3:56 PM → 5:46 PM2h 11m nonstop
Local times, typical schedule. Last flown 2026-04-30.
74%
chance on time
On time (history)
77%
Cancelled
0.0%
Avg arrival delay
32 min
- Arrived on time 77% of the time (78 flights, Jun 2025 to May 2026).
- Never cancelled in 78 scheduled flights.
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 78 flights
Find 3:56 PM flight fares Opens this date on Aviasales
#10 · United 2014
7:20 PM → 9:22 PM2h 02m nonstop
Local times, typical schedule. Last flown 2026-05-31.
74%
chance on time
On time (history)
74%
Cancelled
0.9%
Avg arrival delay
16 min
- Arrived on time 74% of the time (323 flights, Jun 2025 to May 2026).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- 57% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 323 flights
Find United 2014 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines81%
955 flights · 80% on time as flown · 0.3% cancel
SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)77%
865 flights · 79% on time as flown · 0.1% cancel
Frontier Airlines77%
122 flights · 77% on time as flown · 0.1% cancel
Southwest Airlines71%
1,098 flights · 71% on time as flown · 0.2% cancel

On time by departure time

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

Before 9 AM90%
711 flights · avg delay 6 min
9 AM to noon82%
519 flights · avg delay 11 min
Noon to 3 PM78%
176 flights · avg delay 12 min
3 to 6 PM73%
609 flights · avg delay 19 min
6 to 9 PM70%
713 flights · avg delay 19 min
After 9 PM58%
312 flights · avg delay 24 min

Best day: Wednesday (80%). Worst: Thursday (74%).

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 aircraft51%
Airline (crew, maintenance, boarding)31%
Air traffic control and airport volume14%
Severe weather3%

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

DEN to BOI questions

What time of day is best to fly DEN to BOI?: Before 9 AM: 90% of flights arrived on time, against 58% for departures after 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 DEN to BOI?: United, with a season-adjusted 81% chance of operating and arriving on time over 955 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 DEN to BOI?: July (64% on time); the best was November (85%), 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 DEN

Live status: FAA delays and ground stops

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Ask ATIS