Flight profile · American Airlines
AA1820
Ontario (ONT) to Dallas–Fort Worth (DFW) · scheduled 10:54 AM – 3:55 PM
How AA1820 performs
959 operations, July 2023 – August 2026.
Between its first and last recorded date on ONT → DFW, AA1820 averaged about 6 operations a week (959 in 1,158 days, cancelled ones included).
AA1820 arrived on time 78.0% of the time, against 80.0% for all ONT → DFW flights, so this departure is 2.0 percentage points worse than the route as a whole. Against American Airlines’ own flights on this route it is 3.2 points worse.
Source: US DOT Bureau of Transportation Statistics · 959 operations, July 2023 – August 2026 · If AA1820 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where AA1820 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| AA1820 | 78.0% | 1.77% | -6 min | 9.9% | 959 |
| American Airlines on ONT → DFW | 81.2% | 2.04% | -9 min | 7.7% | 6,266 |
| All ONT → DFW flights | 80.0% | 2.13% | -8 min | 7.9% | 7,480 |
AA1820 cancelled 17 of 959 operations (1.77%), close to the 2.13% for ONT → DFW.
9.9% of AA1820’s arrivals were an hour or more late, against 7.9% across ONT → DFW, so the long delays are more common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – August 2026
Why AA1820 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for AA1820 on ONT → DFW. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies AA1820 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, AA1820 pushed back an average of 80 minutes late; when it came in on time or early, an average of 4 minutes late.
Matched by tail number to the aircraft’s previous flight into ONT: 925 of 943 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| AA1820 | 18% | 95% | 9% |
| Network, same turn | 18% | 85% | 10% |
52 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 45 to 59 minutes. How often AA1820’s aircraft landed 15 or more minutes late is about the same as the network’s and, once the aircraft was late, how often AA1820 left 15 or more minutes late is higher than the network’s.
Which Flight Numbers Pay for a Late Aircraft ranks the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – August 2026
From pushback to gate
When it leaves ONT late, does that still matter by the time it reaches DFW?
AA1820 pushes back an average of 22.2 minutes late and reaches the gate at DFW an average of 16.4 minutes late. The 5.8 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. Its 13.7 minutes on the taxiways at ONT is about what any departure from the airport in that hour spends.
On arrival at DFW, AA1820 spends 11.5 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 2.0 minutes shorter than a typical DFW arrival (13.6 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 5,874 ONT departures. Taxi-in is landing to gate, set against 988,998 arrivals at DFW. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – August 2026
The hour it leaves ONT
AA1820 has one departure time, 10:54 AM, so this is what that hour at ONT is worth.
On-time arrival rate. 5,874 departures from ONT are scheduled in the 10 AM–11 AM hour over the period, against 82,177 across the whole day.
AA1820 is scheduled out of ONT at 10:54 AM, in the 10 AM–11 AM bank. Departures from ONT in that hour arrive on time 84.2% of the time against 83.4% across the airport’s whole day, so the hour AA1820 leaves in is an ordinary one for ONT and explains nothing about its record either way.
Both airport figures cover every destination from ONT, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – August 2026 · Hours below 120 departures are not scored.
By day of week
Does AA1820 run worse on particular days?
Monday scored highest and Wednesday lowest, 8.5 points apart, but with about 137 operations per scored day that is within what chance alone produces, so no day stands out.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – August 2026 · Days with fewer than 120 operations are not scored.
Other routes AA1820 has flown
Carriers reassign flight numbers. AA1820 also served these 6 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DFW→ONT Dallas–Fort Worth to Ontario | July 1, 2023 – August 31, 2026 | 957 | 81.7% |
| DFW→EWR Dallas–Fort Worth to Newark | May 21, 2026 – August 4, 2026 | 76 | — |
| EWR→DFW Newark to Dallas–Fort Worth | May 21, 2026 – July 1, 2026 | 41 | — |
| AUS→PHL Austin to Philadelphia | April 7, 2026 – May 20, 2026 | 44 | — |
| PHL→AUS Philadelphia to Austin | April 7, 2026 – May 20, 2026 | 44 | — |
| LAX→DFW Los Angeles to Dallas–Fort Worth | January 23–27, 2024 | 5 | — |
The figures above describe only ONT → DFW, the route AA1820 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
59 min late
against a median of 6 min early
AA1820 has an average that understates its risk: a typical arrival is 6 min early, but the worst tenth are 65 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 959 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| AA1412 | American Airlines | 89.6% | 11 min early | 1,158 |
| AA1820 this flight | American Airlines | 78.0% | 6 min early | 959 |
| AA2635 | American Airlines | 71.8% | 2 min early | 1,010 |
Among all 3 departures on this route with at least 600 operations, AA1820 has the 2nd highest on-time rate, 11.6 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 959 records of AA1820 operating ONT → DFW, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed