Route on-time record
ATL to PDX: most on-time flights and the best time to fly
Atlanta (Hartsfield Jackson Atlanta International Airport) to Portland (Portland International Airport). 1,594 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was Delta 539 at 8:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ATL → PDX
Atlanta to Portland: 1,594 nonstop flights a year
On time (12 months)
79%
Cancelled
1.1%
avg delay 13 min
Best time to leave
9 AM to noon
89% on time vs 74% 3 to 6 PM
Most reliable airline
Alaska
80% chance on time
Lowest nonstop fare seen in the next two months: $130 (Alaska 783 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 · Delta 539
8:15 AM → 10:30 AM5h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 83%
- Cancelled
- 1.6%
- Avg arrival delay
- 8 min
- Arrived on time 83% of the time (358 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 358 flights
Find Delta 539 fares Opens this date on Aviasales#2 · Alaska 783
4:33 PM → 6:55 PM5h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.7%
- Avg arrival delay
- 15 min
- Arrived on time 81% of the time (284 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 74% on time; 9 AM to noon: 89%).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 284 flights
Find Alaska 783 fares Opens this date on Aviasales#3 · Delta 503
4:48 PM → 7:00 PM5h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.6%
- Avg arrival delay
- 17 min
- Arrived on time 73% of the time (350 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 74% on time; 9 AM to noon: 89%).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 350 flights
Find Delta 503 fares Opens this date on Aviasales#4 · Delta 478
7:54 PM → 10:08 PM5h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
- On time (history)
- 73%
- Cancelled
- 1.2%
- Avg arrival delay
- 15 min
- Arrived on time 73% of the time (322 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 322 flights
Find Delta 478 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines80%
286 flights · 81% on time as flown · 0.8% cancel
- Delta Air Lines78%
1,306 flights · 78% on time as flown · 1.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
342 flights · avg delay 8 min
- 9 AM to noon89%
204 flights · avg delay 6 min
- 3 to 6 PM74%
391 flights · avg delay 16 min
- 6 to 9 PM76%
606 flights · avg delay 16 min
- After 9 PM79%
49 flights · avg delay 14 min
Best day: Tuesday (83%). Worst: Sunday (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)34%
- Air traffic control and airport volume31%
- Late-arriving aircraft23%
- 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
ATL to PDX questions
- What time of day is best to fly ATL to PDX?
- 9 AM to noon: 89% of flights arrived on time, against 74% for departures 3 to 6 PM.
- Which airline is most on time from ATL to PDX?
- Alaska, with a season-adjusted 80% chance of operating and arriving on time over 286 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 ATL to PDX?
- July (73% on time); the best was September (91%), 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 ATL
- PDX to ATL (return)
- ATL to LGA 73%
- ATL to MCO 69%
- ATL to FLL 69%
- ATL to DCA 69%
- ATL to DFW 73%
- ATL to ORD 71%
- ATL to EWR 72%
- ATL to MIA 70%
- ATL to TPA 71%
- ATL to PHL 73%
- ATL to DEN 76%
- ATL to BWI 74%
Live status: FAA delays and ground stops