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American Airlines / ONT → DFW

AA 1820 on time

American Airlines 1820: Ontario to Dallas at 10:56 a.m.; Dallas to Ontario at 8:40 a.m. (past 12 months). Figures below the title are for ONT → DFW, its busiest leg

On time
76%
244 flights · likely 71–81%
Cancelled
2.5%
of scheduled flights
Typical arrival
−7 min
median vs schedule
When late
+106 min
average delay
Similar flights
76%
AA, same route & hour

About 1 in 4 AA 1820 flights from Ontario arrived 15+ minutes late, diverted or cancelled over the past year (24%); 2.5% were cancelled. The typical flight landed 7 minutes early.

AA 1820: ONT → DFW

Scheduled to leave Ontario at 10:56 a.m. local time. Over the past year it arrived on time 76% of the time (244 flights), in line with other AA flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jun 2025: 63% on time (30 flights)63JunJul 2025: 57% on time (30 flights)57JulAug 2025: 55% on time (31 flights)55AugSep 2025: 67% on time (30 flights)67SepOct 2025: 55% on time (31 flights)55OctNov 2025: 76% on time (29 flights)76NovDec 2025: 81% on time (31 flights)81DecJan 2026: 84% on time (31 flights)84JanFeb 2026: 79% on time (28 flights)79FebMar 2026: 90% on time (31 flights)90MarApr 2026: too few flights (6 flights)AprAug 2026: 81% on time (27 flights)81Aug

By day of week

DayFlightsOn time
Monday3678%
Tuesday3474%
Wednesday3591%
Thursday3474%
Friday3571%
Saturday3571%
Sunday3574%

Why it was late

Late inbound plane 80%Airline (crew, maintenance, ops) 16%Air traffic & airport (NAS) 3%Security 1%Severe weather 1%

All flights ONT → DFW · Connecting off AA 1820? Check the risk

AA 1820: DFW → ONT

Scheduled to leave Dallas at 8:40 a.m. local time. Over the past year it arrived on time 79% of the time (243 flights), worse than other AA flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jun 2025: 77% on time (30 flights)77JunJul 2025: 63% on time (30 flights)63JulAug 2025: 63% on time (30 flights)63AugSep 2025: 77% on time (30 flights)77SepOct 2025: 57% on time (30 flights)57OctNov 2025: 79% on time (29 flights)79NovDec 2025: 77% on time (31 flights)77DecJan 2026: 74% on time (31 flights)74JanFeb 2026: 86% on time (28 flights)86FebMar 2026: 97% on time (31 flights)97MarApr 2026: too few flights (6 flights)AprAug 2026: 85% on time (27 flights)85Aug

By day of week

DayFlightsOn time
Monday3683%
Tuesday3376%
Wednesday3586%
Thursday3482%
Friday3574%
Saturday3569%
Sunday3580%

Why it was late

Airline (crew, maintenance, ops) 58%Late inbound plane 33%Air traffic & airport (NAS) 8%Severe weather 1%

All flights DFW → ONT · Connecting off AA 1820? Check the risk

Questions

How often is AA 1820 from ONT to DFW late?

American Airlines 1820 from Ontario, CA to Dallas/Fort Worth, TX arrived 15 or more minutes late, was diverted or was cancelled on 24% of 244 scheduled flights between September 2025 and August 2026. 2.5% were cancelled.

How often is AA 1820 from DFW to ONT late?

American Airlines 1820 from Dallas/Fort Worth, TX to Ontario, CA arrived 15 or more minutes late, was diverted or was cancelled on 21% of 243 scheduled flights between September 2025 and August 2026. 2.5% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check American Airlines for today's flight. Method.