ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
ONT → PDX
Ontario to Portland: 522 nonstop flights a year
On time (12 months)
88%
Cancelled
0.6%
avg delay 8 min
Best time to leave
Before 9 AM
91% on time vs 78% noon to 3 PM
Most reliable airline
SkyWest
90% chance on time
Lowest nonstop fare seen in the next two months: $225 (Southwest 249 on 2026-10-27). 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 · Alaska 544
7:00 AM → 9:28 AM2h 28m nonstop
Local times, typical schedule. Last flown 2026-05-12.
93%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.5%
- Avg arrival delay
- 5 min
- Arrived on time 94% of the time (188 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; Noon to 3 PM: 78%).
Moderate track record · 188 flights
Find Alaska 544 fares Opens this date on Aviasales#2 · SkyWest 3426 · sold as United Express, Delta Connection, American Eagle or Alaska
5:56 PM → 8:25 PM2h 29m nonstop
Local times, typical schedule. Last flown 2026-05-11.
93%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (12 flights, Jun 2025 to May 2026).
- Short track record (12 flights), so its score leans on the airline's record at this hour.
Limited track record · 12 flights
Find 5:56 PM flight fares Opens this date on Aviasales#3 · Alaska 341
6:08 PM → 8:33 PM2h 25m nonstop
Local times, typical schedule. Last flown 2026-03-16.
89%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 91% of the time (56 flights, Jun 2025 to May 2026).
- Never cancelled in 56 scheduled flights.
- 80% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (56 flights), so its score leans on the airline's record at this hour.
Limited track record · 56 flights
Find Alaska 341 fares Opens this date on Aviasales#4 · Alaska 1333
11:15 AM → 1:39 PM2h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 79% of the time (19 flights, Jun 2025 to May 2026).
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find Alaska 1333 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)90%
62 flights · 92% on time as flown · 0.4% cancel
- Alaska Airlines89%
351 flights · 91% on time as flown · 0.8% cancel
- Frontier Airlines82%
109 flights · 77% on time as flown · 0.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
260 flights · avg delay 6 min
- Noon to 3 PM78%
60 flights · avg delay 11 min
- 3 to 6 PM88%
117 flights · avg delay 10 min
- 6 to 9 PM86%
66 flights · avg delay 8 min
Best day: Saturday (90%). Worst: Thursday (84%).
Smarter routing
Nearby airports that run more on time
SNA → PDX 92% chance on time
John Wayne Orange County International Airport to Portland International Airport · 1,543 flights a year · 30 mi from your airports · yours: 88%
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