Route on-time record
SEA to PDX: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Portland (Portland International Airport). 4,748 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was SkyWest 3953 at 7:25 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → PDX
Seattle to Portland: 4,748 nonstop flights a year
On time (12 months)
82%
Cancelled
0.7%
avg delay 10 min
Best time to leave
Before 9 AM
92% on time vs 76% after 9 PM
Most reliable airline
SkyWest
85% chance on time
Lowest nonstop fare seen in the next two months: $197 (Alaska 2348 on 2026-10-24). 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 3953 · sold as United Express, Delta Connection, American Eagle or Alaska
7:25 AM → 8:37 AM1h 09m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.3%
- Avg arrival delay
- 4 min
- Arrived on time 94% of the time (364 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 PM: 76%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 364 flights
Find 7:25 AM flight fares Opens this date on Aviasales#2 · SkyWest 3818 · sold as United Express, Delta Connection, American Eagle or Alaska
9:00 AM → 10:02 AM1h 02m nonstop
Local times, typical schedule. Last flown 2026-04-12.
92%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.4%
- Avg arrival delay
- 3 min
- Arrived on time 92% of the time (254 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 254 flights
Find 9:00 AM flight fares Opens this date on Aviasales#3 · SkyWest 3997 · sold as United Express, Delta Connection, American Eagle or Alaska
8:15 PM → 9:18 PM1h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 91% of the time (211 flights, Jun 2025 to May 2026).
- Never cancelled in 211 scheduled flights.
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 211 flights
Find 8:15 PM flight fares Opens this date on Aviasales#4 · SkyWest 4023 · sold as United Express, Delta Connection, American Eagle or Alaska
9:30 AM → 10:40 AM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 3281; its record covers all of them.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 91% of the time (129 flights, Jun 2025 to May 2026).
- Never cancelled in 129 scheduled flights.
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 129 flights
Find 9:30 AM flight fares Opens this date on Aviasales#5 · SkyWest 4062 · sold as United Express, Delta Connection, American Eagle or Alaska
1:40 PM → 2:48 PM1h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 3282; its record covers all of them.
90%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 92% of the time (84 flights, Jun 2025 to May 2026).
- Never cancelled in 84 scheduled flights.
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 84 flights
Find 1:40 PM flight fares Opens this date on Aviasales#6 · Alaska 349
7:45 AM → 8:49 AM1h 04m nonstop
Local times, typical schedule. Last flown 2026-03-17.
88%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 91% of the time (34 flights, Jun 2025 to May 2026).
- Never cancelled in 34 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 PM: 76%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Limited track record · 34 flights
Find Alaska 349 fares Opens this date on Aviasales#7 · SkyWest 3913 · sold as United Express, Delta Connection, American Eagle or Alaska
6:25 PM → 7:26 PM1h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (324 flights, Jun 2025 to May 2026).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 324 flights
Find 6:25 PM flight fares Opens this date on Aviasales#8 · SkyWest 3063 · sold as United Express, Delta Connection, American Eagle or Alaska
8:25 AM → 9:31 AM1h 06m nonstop
Local times, typical schedule. Last flown 2026-05-12.
86%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 90% of the time (21 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 PM: 76%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find 8:25 AM flight fares Opens this date on Aviasales#9 · SkyWest 3252 · sold as United Express, Delta Connection, American Eagle or Alaska
7:18 PM → 8:17 PM59m nonstop
Local times, typical schedule. Last flown 2026-05-12.
86%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 90% of the time (21 flights, Jun 2025 to May 2026).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find 7:18 PM flight fares Opens this date on Aviasales#10 · SkyWest 3258 · sold as United Express, Delta Connection, American Eagle or Alaska
5:40 PM → 6:43 PM1h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 84% of the time (19 flights, Jun 2025 to May 2026).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find 5:40 PM flight 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)85%
3,305 flights · 86% on time as flown · 0.5% cancel
- Delta Air Lines77%
341 flights · 75% on time as flown · 0.2% cancel
- Alaska Airlines73%
1,102 flights · 74% on time as flown · 1.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
727 flights · avg delay 6 min
- 9 AM to noon83%
986 flights · avg delay 9 min
- Noon to 3 PM87%
539 flights · avg delay 6 min
- 3 to 6 PM80%
944 flights · avg delay 12 min
- 6 to 9 PM80%
634 flights · avg delay 12 min
- After 9 PM76%
918 flights · avg delay 14 min
Best day: Tuesday (84%). Worst: Thursday (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.
What delays this route
- Airline (crew, maintenance, boarding)49%
- Late-arriving aircraft26%
- Air traffic control and airport volume12%
- Severe weather12%
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
SEA to PDX questions
- What time of day is best to fly SEA to PDX?
- Before 9 AM: 92% of flights arrived on time, against 76% 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 SEA to PDX?
- SkyWest, with a season-adjusted 85% chance of operating and arriving on time over 3,305 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 SEA to PDX?
- June (75% on time); the best was October (87%), 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 SEA
- PDX to SEA (return)
- SEA to LAX 83%
- SEA to PHX 79%
- SEA to SFO 69%
- SEA to ANC 74%
- SEA to DEN 77%
- SEA to LAS 77%
- SEA to ORD 75%
- SEA to GEG 81%
- SEA to DFW 77%
- SEA to SAN 78%
- SEA to SMF 81%
- SEA to SJC 82%
Live status: FAA delays and ground stops