UA3990United Airlines · IAH → SDF
live · 15m ago
Route confirmed United Airlines

UA3990 HoustonIAH · 10:00 LouisvilleSDF · 13:23

UA3990 by United Airlines flies from Houston (IAH) to Louisville (SDF) for the Tue, Oct 27 departure.

Right nowEn route to Louisville · off blocks 09:57 · 3 min early
13:23

estimated arrival at SDF · local time · ~45 min from now

En routeUA3990 · position estimated
IAHHoustonSDFLouisville
Estimated from the boardsarr 13:23

Board estimate · gate and arrival times. Off blocks 09:57.

Typical gate push−2 minmedian posted departure

Where the minutes go

last 3 operations · gate push → arrival
0+30+60+90 min
10-27
−3 gate
10-26
−2 gate
10-25
+5 gate

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The route today

live boards
IAHHoustonOn-time likelyIAH delay board →
SDFLouisvilleOn-time likelySDF delay board →
IAH→SDFevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
38%Chance of 15+ min delay
2.2%Chance of cancellation
+7 minAvg hub delay right now

Driven mainly by SDF (Louisville), currently flying VFR (visual). For this route and airline, 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 →

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 Louisville flights today

same route · United Airlines
UA3985departs 16:32
UA4050departs 17:10
UA3235departs 17:45
UA4052departs 18:45
UA3236departs 18:50

If UA3990 is cancelled, these are the other United Airlines nonstop flights from Houston to Louisville on the same day, with scheduled departure times in IAH local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →

How UA3990 actually runs

Pro Flight Search has tracked every published board update for UA3990 across the IAH and SDF boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: departed -2 min. Not enough to call it.

The verdict above is that record speaking, so it reflects how UA3990 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
10-27IAH 10:00 09:57 (−3)SDF 13:23
10-26IAH 10:00 09:58 (−2)SDF 13:23
10-25IAH 10:00 10:05 (+5)SDF

Aircraft

Recent tails: N76265.

Board clocks recorded as IAH and SDF published them.

Planning around UA3990? 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 — UA3990 Houston to Louisville on-time performance, measured from the IAH and SDF airport boards.

Canonical URL
https://proflightsearch.com/flight/UA3990
How we measure this →