Route on-time record
ONT to AUS: most on-time flights and the best time to fly
Ontario (Ontario International Airport) to Austin (Austin Bergstrom International Airport). 337 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was Southwest 3526 at 9:20 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ONT → AUS
Ontario to Austin: 337 nonstop flights a year
On time (12 months)
78%
Cancelled
0.3%
avg delay 11 min
Best time to leave
Before 9 AM
82% on time vs 76% noon to 3 PM
Most reliable airline
Southwest
78% chance on time
Lowest nonstop fare seen in the next two months: $420 (Southwest 3259 on 2026-10-23). 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 · Southwest 3526
9:20 AM → 2:00 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
74%
chance on time
- On time (history)
- 68%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 68% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Lands inside AUS's trouble window: 79% of its 91 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (47 flights), so its score leans on the airline's record at this hour.
Limited track record · 47 flights
Find Southwest 3526 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines78%
336 flights · 78% on time as flown · 0.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM82%
68 flights · avg delay 7 min
- 9 AM to noon77%
217 flights · avg delay 12 min
- Noon to 3 PM76%
49 flights · avg delay 11 min
Best day: Saturday (91%). Worst: Sunday (81%).
Smarter routing
Nearby airports that run more on time
SNA → AUS 81% chance on time
John Wayne Orange County International Airport to Austin Bergstrom International Airport · 352 flights a year · 30 mi from your airports · yours: 77%
LGB → AUS 81% chance on time
Long Beach International Airport to Austin Bergstrom International Airport · 470 flights a year · 36 mi from your airports · yours: 77%
BUR → AUS 81% chance on time
Hollywood Burbank/Bob Hope Airport to Austin Bergstrom International Airport · 346 flights a year · 44 mi from your airports · yours: 77%
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
- Air traffic control and airport volume36%
- Late-arriving aircraft32%
- Airline (crew, maintenance, boarding)32%
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
ONT to AUS questions
- What time of day is best to fly ONT to AUS?
- Before 9 AM: 82% of flights arrived on time, against 76% for departures noon to 3 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 ONT to AUS?
- Southwest, with a season-adjusted 78% chance of operating and arriving on time over 336 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 ONT to AUS?
- November (76% on time); the best was September (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 ONT
- AUS to ONT (return)
- ONT to PHX 83%
- ONT to DEN 79%
- ONT to SEA 86%
- ONT to LAS 78%
- ONT to DFW 78%
- ONT to SMF 86%
- ONT to OAK 87%
- ONT to SJC 86%
- ONT to SFO 69%
- ONT to SLC 91%
- ONT to ATL 90%
- ONT to PDX 88%
Live status: FAA delays and ground stops