Route on-time record

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

Phoenix (Phoenix Sky Harbor International Airport) to Denver (Denver International Airport). 8,893 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 337 at 6:00 AM.

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

PHX → DEN

Phoenix to Denver: 8,893 nonstop flights a year

On time (12 months)

77%

Cancelled

0.8%

avg delay 16 min

Best time to leave

Before 9 AM

89% on time vs 66% 3 to 6 PM

Most reliable airline

United

82% chance on time

Check PHX to DEN fares

Lowest nonstop fare seen in the next two months: $47 (Frontier 4768 on 2026-11-05). 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 · United 337
6:00 AM → 8:55 AM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
On time (history)
93%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 93% of the time (88 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
Moderate track record · 88 flights
Find United 337 fares Opens this date on Aviasales
#2 · Southwest 3777
6:10 AM → 9:00 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-29.
92%
chance on time
On time (history)
98%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 98% of the time (40 flights, Jun 2025 to May 2026).
- Never cancelled in 40 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
Limited track record · 40 flights
Find Southwest 3777 fares Opens this date on Aviasales
#3 · United 1885
7:00 AM → 9:55 AM1h 55m nonstop
Local times, typical schedule. Last flown 2026-04-29.
91%
chance on time
On time (history)
96%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 96% of the time (28 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find United 1885 fares Opens this date on Aviasales
#4 · Southwest 4206
6:40 AM → 9:30 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
90%
chance on time
On time (history)
94%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 94% 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: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
Limited track record · 33 flights
Find Southwest 4206 fares Opens this date on Aviasales
#5 · Southwest 1451
5:25 AM → 8:10 AM1h 45m nonstop
Local times, typical schedule. Last flown 2026-04-01.
89%
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: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 1451 fares Opens this date on Aviasales
#6 · Envoy 4112 · sold as American Eagle
8:30 AM → 11:38 AM2h 08m nonstop
Local times, typical schedule. Last flown 2026-05-20.
88%
chance on time
On time (history)
93%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 93% 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: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
Limited track record · 44 flights
Find 8:30 AM flight fares Opens this date on Aviasales
#7 · Southwest 2550
7:00 AM → 9:45 AM1h 45m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
On time (history)
93%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 93% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 2550 fares Opens this date on Aviasales
#8 · United 1298
12:00 PM → 2:55 PM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1998; its record covers all of them.
87%
chance on time
On time (history)
90%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 90% of the time (98 flights, Jun 2025 to May 2026).
- Never cancelled in 99 scheduled flights.
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 98 flights
Find United 1298 fares Opens this date on Aviasales
#9 · Frontier 1376
6:50 AM → 9:43 AM1h 53m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
85%
Cancelled
0.0%
Avg arrival delay
13 min
- Arrived on time 85% of the time (354 flights, Jun 2025 to May 2026).
- Never cancelled in 355 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
Strong track record · 354 flights
Find Frontier 1376 fares Opens this date on Aviasales
#10 · Frontier 4768
8:52 AM → 11:49 AM1h 57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
86%
Cancelled
1.2%
Avg arrival delay
13 min
- Arrived on time 86% of the time (248 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 66%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 43% of its 46 ground stops and delay programs started).
- 69% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 248 flights
Find Frontier 4768 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines82%
2,379 flights · 83% on time as flown · 0.6% cancel
Frontier Airlines79%
1,394 flights · 80% on time as flown · 0.7% cancel
Envoy Air (sold as American Eagle)77%
203 flights · 79% on time as flown · 0.6% cancel
American Airlines74%
961 flights · 74% on time as flown · 0.7% cancel
Southwest Airlines72%
3,938 flights · 73% on time as flown · 1.1% cancel

On time by departure time

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

Before 9 AM89%
2,175 flights · avg delay 7 min
9 AM to noon83%
1,591 flights · avg delay 12 min
Noon to 3 PM74%
1,664 flights · avg delay 20 min
3 to 6 PM66%
1,720 flights · avg delay 24 min
6 to 9 PM70%
1,377 flights · avg delay 20 min
After 9 PM69%
366 flights · avg delay 22 min

Best day: Saturday (82%). Worst: Sunday (76%).

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 aircraft45%
Air traffic control and airport volume29%
Airline (crew, maintenance, boarding)23%
Severe weather2%

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

PHX to DEN questions

What time of day is best to fly PHX to DEN?: Before 9 AM: 89% of flights arrived on time, against 66% for departures 3 to 6 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 PHX to DEN?: United, with a season-adjusted 82% chance of operating and arriving on time over 2,379 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 PHX to DEN?: June (69% 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.

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