ATL → ONTAtlanta to Ontario

live

Direct flights from Atlanta (ATL) to Ontario (ONT): 7 nonstop departures observed each week across 1 airline. 89% of the last 18 operated flights arrived within 15 minutes of schedule. The median arrival is 11 minutes early. No cancellations were recorded across the 18 tracked flights. The nonstop covers 3,050 km, an estimated 4 hours 25 minutes in the air. Measured by Pro Flight Search from live flight boards at Atlanta and Ontario. Updated 20 October 2026 at 19:03 UTC.

Today, ATL → ONT

Tue 20 Oct · local times
  1. 09:30 DL665Delta Air Lines Sched 09:30Departure not confirmed by the board ONT 11:06scheduled
  2. 18:54 DL779Delta Air Lines On scheduleTS ·

Checked ATL board 15:03 · ONT board 10:18

ATL Atlanta smooth · +11
ONT Ontario smooth · +0
3,050 km · ~4h 25m est.
dep bank 09:30–20:207x weekly
Runs reliable · 1 airline · 7x weekly · nonstop
89% on time

of the last 18 operated ATL → ONT flights arrived within 15 minutes

Median arrival delay is −11 min. 0 of 18 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−11 minacross the last 18 operated legs
Flight time~4h 25mestimated from route distance
Weekly departures7x1 direct airline on the leg
Cancelled0.0%recent route rate · 0 of 18

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Delta Air Lines

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Delta Air LinesDL89% on time

Flights DL665 09:30 daily · DL2891 16:51 Mo Th Fr Sa Su · DL779 varies Mo Tu We Th Fr Su

History

operated legs · board outcomes
10-19DL2891dep +11 → arr−14
10-19DL665dep +23 → arr−9
10-19DL779dep +11 → arr−18
10-18DL2891dep +11 → arr−11
10-18DL665dep +13 → arr−18
10-18DL779dep +13 → arr−14
10-17DL2891dep +16 → arr−15
10-17DL665dep +22 → arr−13
10-16DL2891dep +19 → arr+1
10-16DL665dep +10 → arr−23
10-16DL779dep +56 → arr+41
10-15DL2891dep +25 → arr+1
10-15DL665dep +13 → arr−6
10-15DL779dep +21 → arr−8
10-14DL665dep +10 → arr−21
10-14DL779dep +44 → arr+25
10-13DL665dep +15 → arr−16
10-13DL779dep +10 → arr−5

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
ATLAtlanta +11 min smooth 🌤 few clouds · ENE 6 kt Full ATL delay board →
ONTOntario +0 min smooth 🌤 few clouds · WSW 6 kt Full ONT delay board →

Weather lens

Current conditions put the pressure at ONT: 37% odds of a 15+ minute delay and around +9 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the Atlanta to Ontario route actually runs

Pro Flight Search records official board updates for nonstop ATL to ONT flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — Atlanta (ATL) to Ontario (ONT) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/ATL-ONT
How we measure this →

ATL to ONT questions

Is ATL–ONT running on time right now?

Smooth skies ahead. The departure side at ATL is the weaker end, route health score 92/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on ATL–ONT?

Operators schedule morning departures around 09:30 from ATL. Earlier flights typically land before destination-airport delays accumulate later in the day; check the ONT delay card to confirm conditions when you'd arrive.

How long is the flight from ATL to ONT?

Great-circle distance is 3,050 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 245–291 min gate-to-gate on this route.

How often does ATL–ONT fly?

Delta Air Lines runs the route with about 18 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.