Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

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

Denver (Denver International Airport) to Portland (Portland International Airport). 4,297 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was United 2455 at 1:27 PM.

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

DEN → PDX

Denver to Portland: 4,297 nonstop flights a year

On time (12 months)

74%

Cancelled

0.5%

avg delay 15 min

Best time to leave

Before 9 AM

87% on time vs 60% after 9 PM

Most reliable airline

United

81% chance on time

Check DEN to PDX 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 2455

    1:27 PM → 3:13 PM2h 46m nonstop

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

    88%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • 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 (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 2455 fares Opens this date on Aviasales

  2. #2 · Alaska 714

    8:00 AM → 9:49 AM2h 49m nonstop

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

    88%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 100% of the time (18 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 60%).
    • 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 (18 flights), so its score leans on the airline's record at this hour.

    Limited track record · 18 flights

    Find Alaska 714 fares Opens this date on Aviasales

  3. #3 · United 1247

    8:00 AM → 9:48 AM2h 48m nonstop

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

    88%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (362 flights, Jun 2025 to May 2026).
    • Never cancelled in 363 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 60%).
    • 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 · 362 flights

    Find United 1247 fares Opens this date on Aviasales

  4. #4 · United 644

    11:21 AM → 1:44 PM2h 48m nonstop

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

    86%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 86% of the time (312 flights, Jun 2025 to May 2026).
    • Never cancelled in 312 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 · 312 flights

    Find United 644 fares Opens this date on Aviasales

  5. #5 · Alaska 684

    11:46 AM → 1:35 PM2h 49m nonstop

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

    84%

    chance on time

    On time (history)
    85%
    Cancelled
    0.6%
    Avg arrival delay
    7 min
    • Arrived on time 85% of the time (165 flights, Jun 2025 to May 2026).
    • 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 · 165 flights

    Find Alaska 684 fares Opens this date on Aviasales

  6. #6 · Frontier 2553

    9:10 AM → 4:46 PM2h 53m nonstop

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

    81%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 82% of the time (170 flights, Jun 2025 to May 2026).
    • Never cancelled in 170 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 · 170 flights

    Find Frontier 2553 fares Opens this date on Aviasales

  7. #7 · United 1337

    4:00 PM → 5:44 PM2h 45m nonstop

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

    81%

    chance on time

    On time (history)
    81%
    Cancelled
    0.3%
    Avg arrival delay
    11 min
    • Arrived on time 81% of the time (327 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.

    Strong track record · 327 flights

    Find United 1337 fares Opens this date on Aviasales

  8. #8 · Southwest 4017

    8:35 AM → 10:15 AM2h 40m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1304; its record covers all of them.

    76%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 81% of the time (78 flights, Jun 2025 to May 2026).
    • Never cancelled in 78 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 60%).
    • 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 · 78 flights

    Find Southwest 4017 fares Opens this date on Aviasales

  9. #9 · United 1770

    9:05 PM → 10:54 PM2h 49m nonstop

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

    76%

    chance on time

    On time (history)
    78%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 78% of the time (83 flights, Jun 2025 to May 2026).
    • Never cancelled in 83 scheduled flights.
    • Leaves in this route's least on-time window (After 9 PM: 60% on time; Before 9 AM: 87%).
    • 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 · 83 flights

    Find United 1770 fares Opens this date on Aviasales

  10. #10 · United 498

    7:25 PM → 9:10 PM2h 49m nonstop

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

    75%

    chance on time

    On time (history)
    76%
    Cancelled
    0.3%
    Avg arrival delay
    17 min
    • Arrived on time 76% of the time (363 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.
    • 53% of its delay minutes came from the plane arriving late from an earlier flight.

    Strong track record · 363 flights

    Find United 498 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines81%

    1,822 flights · 82% on time as flown · 0.4% cancel

  • Frontier Airlines78%

    337 flights · 78% on time as flown · 0.8% cancel

  • Alaska Airlines75%

    552 flights · 76% on time as flown · 0.5% cancel

  • Southwest Airlines65%

    1,573 flights · 64% on time as flown · 0.4% cancel

On time by departure time

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

  • Before 9 AM87%

    884 flights · avg delay 7 min

  • 9 AM to noon84%

    913 flights · avg delay 9 min

  • Noon to 3 PM75%

    411 flights · avg delay 13 min

  • 3 to 6 PM73%

    569 flights · avg delay 14 min

  • 6 to 9 PM62%

    1,079 flights · avg delay 24 min

  • After 9 PM60%

    441 flights · avg delay 27 min

Best day: Tuesday (79%). 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.

J
76
F
75
M
77
A
79
M
73
J
69
J
66
A
75
S
83
O
82
N
84
D
77

What delays this route

  • Late-arriving aircraft55%
  • Airline (crew, maintenance, boarding)30%
  • Air traffic control and airport volume13%
  • 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

DEN to PDX questions

What time of day is best to fly DEN to PDX?
Before 9 AM: 87% of flights arrived on time, against 60% 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 PDX?
United, with a season-adjusted 81% chance of operating and arriving on time over 1,822 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 PDX?
July (66% on time); the best was November (84%), 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