Flight number record

AA 1840

American Airlines · Charlotte to Houston

Route: CLT → IAH
Departs: 20:45
Flights: 280
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AA 1840, check with American Airlines.

AA 1840 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 280 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so AA 1840 runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 270 completed flights

Avg delay

88 min

Across delayed arrivals only, not all flights

Cancelled

3.21%

National rate is 1.81%

1 hour+ late

10.4%

National rate is 8.1%

These figures cover 280 flights between July 2025 and June 2026. Beyond the headline rate, 10.4% 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 1840 flies

AA 1840 flies CLT to IAH without a single fixed slot. Its most common scheduled departure was 20:45, used on 65 of 280 flights, with 22:25 (35 flights) and 21:40 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:4565 flights23.2%
Departs 22:2535 flights12.5%
Departs 21:4034 flights12.1%

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 20:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and AA 1840 runs level with that at 71.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

AA 1840 next to CLT to IAH

Every carrier on CLT to IAH combined arrived on time 77.6% of the time across 2,348 flights, so AA 1840 is 6 points behind it. American flew 1,623 flights on the same city pair under all its flight numbers, including this one, and those ran 76.1% on time. Across its whole network American Airlines managed 74.4%, which this flight trails by 3 points.

AA 1840 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AA 1840thin sample	280	71.5%	88 min	3.21%	C−
All American Airlines on CLT–IAH	1,623	76.1%	73 min	1.60%	B
All carriers on CLT–IAH	2,348	77.6%	74 min	1.96%	B
American Airlines, whole network	986,297	74.4%	85 min	2.29%	C

Across the year

AA 1840 quarter by quarter

AA 1840 did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.5% on time and its weakest Jul–Sep 2025 at 58.1%, a swing of 29 points on roughly 70 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 202589 flights58.1%
Oct–Dec 202575 flights80.8%
Jan–Mar 202637 flights87.5%
Apr–Jun 202679 flights70.9%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, AA 1840 did best on Monday at 80.0% on time and worst on Sunday at 62.2%. Each day rests on about 40 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why AA 1840 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 48% of the 6,742 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.

Late-arriving aircraft
48%
Carrier
32%
Extreme weather
12%
National Airspace System
8%

Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 6,742 delay minutes reported on AA 1840.

Cancellations run at 3.21%, against 1.81% nationally. That is about one flight in 30 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. 10.4% 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 912 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.

The same number turns up on four other city pairs in the data, including DFW to LEX (40), LEX to DFW (40) and IAH to CLT (38), but none flew often enough under AA 1840 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to CLT to IAH only.

One caution: this is a thin sample. 280 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.

What to do with this

Booking AA 1840

For a booking, the cancellation rate is the figure to plan around on AA 1840: 3.21% of its 280 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.

Where to go next

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.

Key figures