UA4021United Airlines · IAH → MEM
live · 27m ago
Route confirmed United Airlines

UA4021 HoustonIAH · 14:38 MemphisMEM · 16:18

UA4021 by United Airlines flies from Houston (IAH) to Memphis (MEM) for the Wed, Nov 11 departure.

Right nowAwaiting arrival in Memphis · off blocks 14:33 · 5 min early
16:18

estimated arrival at MEM · local time · past this estimate · waiting on the board

En routeUA4021 · position estimated
IAHHoustonMEMMemphis
Estimated from the boardsarr 16:18

Board estimate · gate and arrival times. Off blocks 14:33.

The route today

live boards
IAHHoustonOn-time likelyIAH delay board →
MEMMemphisModerate riskMEM delay board →
IAH→MEMevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
36%Chance of 15+ min delay
1.2%Chance of cancellation
+12 minTypical airport delay in this weather

Conditions at IAH and MEM are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at Houston

Forecast

Thu 12 Nov, local date

High26°Clikely 24°C to 27°C
Low14°Clikely 13°C to 15°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Memphis

Forecast

Thu 12 Nov, local date

High18°Clikely 17°C to 20°C
Low9°Clikely 7°C to 10°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Houston to Memphis flights today

same route · United Airlines
UA5574departs 07:20
UA4724departs 11:57
UA4054departs 16:28
UA2682departs 18:25
UA6129departs 19:55

If UA4021 is cancelled, these are the other United Airlines nonstop flights from Houston to Memphis on the same day, with scheduled departure times in IAH local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How UA4021 actually runs

Pro Flight Search has tracked every published board update for UA4021 across the IAH and MEM boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 2 completed legs so far: departed -5 min. Not enough to call it.

The verdict above is that record speaking, so it reflects how UA4021 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocks

Board log

scheduled → actual, per operation
11-11IAH 14:38 14:33 (−5)MEM 16:18
11-10IAH 14:38 14:33 (−5)MEM

Board clocks recorded as IAH and MEM published them.

Planning around UA4021? 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: UA4021 Houston to Memphis on-time performance, measured from the IAH and MEM airport boards.

Canonical URL
https://proflightsearch.com/flight/UA4021
How we measure this →