Flight number record
AA 1820
American Airlines · Ontario to Dallas-Fort Worth
- Route
- ONT → DFW
- Departs
- 10:56
- Flights
- 278
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AA 1820, check with American Airlines.
AA 1820 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land close to two hours behind schedule. That rests on 278 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.6%, so AA 1820 runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.
Key figures
On time
73.6%
Arrivals under 15 minutes late, of 269 completed flights
Avg delay
124 min
Across delayed arrivals only, not all flights
Cancelled
2.52%
National rate is 1.81%
1 hour+ late
10.8%
National rate is 8.1%
These figures cover 278 flights between July 2025 and June 2026. Beyond the headline rate, 10.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When AA 1820 flies
AA 1820 flies ONT to DFW without a single fixed slot. Its most common scheduled departure was 10:56, used on 54 of 278 flights, with 10:53 (51 flights) and 10:50 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 10:5654 flights19.4%
- Departs 10:5351 flights18.3%
- Departs 10:5046 flights16.5%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 10:56 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AA 1820 runs 11 points worse at 73.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
AA 1820 next to ONT to DFW
Every carrier on ONT to DFW combined arrived on time 78.2% of the time across 2,307 flights, so AA 1820 is 5 points behind it. American flew 1,985 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network American Airlines managed 74.4%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 1820thin sample | 278 | 73.6% | 124 min | 2.52% | C |
| All American Airlines on ONT–DFW | 1,985 | 78.6% | 98 min | 2.97% | B |
| All carriers on ONT–DFW | 2,307 | 78.2% | 94 min | 3.03% | B− |
| American Airlines, whole network | 986,297 | 74.4% | 85 min | 2.29% | C |
Across the year
AA 1820 quarter by quarter
AA 1820 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.4% on time and its weakest Jul–Sep 2025 at 61.4%, a swing of 27 points on roughly 93 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202591 flights61.4%
- Oct–Dec 202591 flights71.9%
- Jan–Mar 202690 flights88.4%
- Apr–Jun 20266 flights—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AA 1820 did best on Wednesday at 85.0% on time and worst on Friday at 68.4%. Each day rests on about 40 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Delay causes
Why AA 1820 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 64% of the 8,771 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 64%Late-arriving aircraft
- 28%Carrier
- 4%National Airspace System
- 3%Extreme weather
- 1%Security
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 8,771 reported delay minutes here, that single category outweighs weather by 23 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 8,771 delay minutes reported on AA 1820.
Cancellations run at 2.52%, against 1.81% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 1,188 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
AA 1820 is not only a ONT to DFW flight. It also flew DFW to ONT (276 flights, 76.6% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 278 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DFW to ONTthin sample | 276 | 76.6% | 70 min | 2.54% | B |
What to do with this
Booking AA 1820
For a booking, the cancellation rate is the figure to plan around on AA 1820: 2.52% of its 278 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ONT to DFW, every carrier and departure
- DFW to ONT, the return direction
- American Airlines 1412 on the same route87.8%
- American Airlines 2635 on the same route69.5%
- Dallas/Fort Worth International (DFW) delay statistics
- American Airlines on-time record
- Every American Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means American Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.