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Route on-time record

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

Portland (Portland International Airport) to Denver (Denver International Airport). 4,298 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was United 459 at 5:00 AM.

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

PDX → DEN

Portland to Denver: 4,298 nonstop flights a year

On time (12 months)

80%

Cancelled

0.5%

avg delay 12 min

Best time to leave

Before 9 AM

90% on time vs 68% 3 to 6 PM

Most reliable airline

United

89% chance on time

Check PDX to DEN 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. #1 · United 459

    5:00 AM → 8:38 AM2h 38m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    96%

    chance on time

    On time (history)
    97%
    Cancelled
    0.3%
    Avg arrival delay
    4 min
    • Arrived on time 97% of the time (337 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 68%).

    Strong track record · 337 flights

    Find United 459 fares Opens this date on Aviasales

  2. #2 · United 2375

    8:40 AM → 12:19 PM2h 39m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    95%

    chance on time

    On time (history)
    96%
    Cancelled
    0.5%
    Avg arrival delay
    5 min
    • Arrived on time 96% of the time (362 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 68%).

    Strong track record · 362 flights

    Find United 2375 fares Opens this date on Aviasales

  3. #3 · United 2448

    12:46 PM → 4:25 PM2h 39m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 2230; its record covers all of them.

    92%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 96% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (53 flights), so its score leans on the airline's record at this hour.

    Limited track record · 53 flights

    Find United 2448 fares Opens this date on Aviasales

  4. #4 · Southwest 1375

    8:05 AM → 11:35 AM2h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    90%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 96% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 68%).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 1375 fares Opens this date on Aviasales

  5. #5 · United 2334

    7:05 PM → 10:45 PM2h 39m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    88%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 89% of the time (200 flights, Jun 2025 to May 2026).
    • Never cancelled in 200 scheduled flights.

    Strong track record · 200 flights

    Find United 2334 fares Opens this date on Aviasales

  6. #6 · Southwest 2200

    7:25 AM → 10:55 AM2h 25m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    84%

    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: 90% on time; 3 to 6 PM: 68%).
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 2200 fares Opens this date on Aviasales

  7. #7 · United 1787

    4:15 PM → 7:54 PM2h 39m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    84%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (160 flights, Jun 2025 to May 2026).
    • Never cancelled in 160 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 68% on time; Before 9 AM: 90%).
    • 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 · 160 flights

    Find United 1787 fares Opens this date on Aviasales

  8. #8 · Alaska 684

    7:00 AM → 10:50 AM2h 49m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    83%

    chance on time

    On time (history)
    88%
    Cancelled
    0.6%
    Avg arrival delay
    6 min
    • Arrived on time 88% of the time (165 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 68%).

    Moderate track record · 165 flights

    Find Alaska 684 fares Opens this date on Aviasales

  9. #9 · United 1411

    1:00 PM → 4:33 PM2h 33m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    83%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 87% of the time (92 flights, Jun 2025 to May 2026).
    • Never cancelled in 92 scheduled flights.
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
    • 52% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 92 flights

    Find United 1411 fares Opens this date on Aviasales

  10. #10 · United 2793

    11:05 AM → 2:43 PM2h 38m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    82%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 2793 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines89%

    1,821 flights · 90% on time as flown · 0.6% cancel

  • Frontier Airlines76%

    338 flights · 74% on time as flown · 1.0% cancel

  • Alaska Airlines76%

    553 flights · 75% on time as flown · 0.4% cancel

  • Southwest Airlines72%

    1,573 flights · 72% on time as flown · 0.3% cancel

On time by departure time

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

  • Before 9 AM90%

    1,774 flights · avg delay 6 min

  • 9 AM to noon79%

    403 flights · avg delay 10 min

  • Noon to 3 PM70%

    1,108 flights · avg delay 17 min

  • 3 to 6 PM68%

    642 flights · avg delay 20 min

  • 6 to 9 PM79%

    356 flights · avg delay 13 min

Best day: Saturday (85%). Worst: Friday (79%).

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.

J
84
F
87
M
89
A
84
M
79
J
73
J
74
A
79
S
85
O
88
N
90
D
84

What delays this route

  • Air traffic control and airport volume39%
  • Late-arriving aircraft34%
  • Airline (crew, maintenance, boarding)24%
  • 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

PDX to DEN questions

What time of day is best to fly PDX to DEN?
Before 9 AM: 90% of flights arrived on time, against 68% 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 PDX to DEN?
United, with a season-adjusted 89% chance of operating and arriving on time over 1,821 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 PDX to DEN?
June (73% on time); the best was November (90%), 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 PDX

Live status: FAA delays and ground stops