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United Airlines

Is UA4540 delayed?

Service date: · Scheduled departure date (UTC)

Arrived

27 min early

Official source · Updated

Departure

Chattanooga

CHA

Actual

Scheduled 10:00

Sep 22

Arrival

Chicago

ORD

Actual

Scheduled 07:04

Sep 22

Times shown in airport local time

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual

Arrival · UTC

Scheduled
Estimated
Actual
View this flight’s market

Market prices express trading expectations about a contract’s stated threshold. They do not confirm airline status. The linked market shows its terms and activity.

Recent arrivals

Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.

  • CHA → ORD

    27 min early

  • ORD → ATW

    7 min early

  • CHA → ORD

    72 min late

  • ORD → ATW

    278 min late

  • CHA → ORD

    84 min late
Flight history and details

Aug 24, 2026 — Sep 23, 2026

Observed arrivals
24
Arrivals over 15 minutes late
7
Observed cancellations
2
Observed occurrences
26

Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.

How flight status works

UA4540 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Sep 22, 2026ArrivedChattanoogaChicago
View this flight’s market
-27
Sep 21, 2026ArrivedChicagoAppleton
-7
Sep 21, 2026ArrivedChattanoogaChicago
72
Sep 20, 2026ArrivedChicagoAppleton
278
Sep 20, 2026ArrivedChattanoogaChicago
84
Sep 19, 2026CancelledChattanoogaChicagoNot available
Not available
Sep 18, 2026ArrivedChicagoAppleton
97
Sep 18, 2026ArrivedChattanoogaChicago
-17
Sep 17, 2026CancelledChicagoAppletonNot available
Not available
Sep 17, 2026ArrivedChattanoogaChicago
299
Sep 16, 2026ArrivedChattanoogaChicago
-1
Sep 15, 2026ArrivedChattanoogaChicago
-17
Sep 14, 2026ArrivedChattanoogaChicago
5
Sep 13, 2026ArrivedChicagoAppleton
-27
Sep 13, 2026ArrivedChattanoogaChicago
-12
Sep 12, 2026ArrivedChattanoogaChicago
16
Sep 11, 2026ArrivedChattanoogaChicago
-22
Sep 10, 2026ArrivedChicagoAppleton
116
Sep 10, 2026ArrivedChattanoogaChicago
6
Sep 9, 2026ArrivedChattanoogaChicago
-15
Sep 8, 2026ArrivedChicagoAppleton
-30
Sep 8, 2026ArrivedChattanoogaChicago
-9
Sep 7, 2026ArrivedChattanoogaChicago
-9
Sep 6, 2026ArrivedChattanoogaChicago
-12
Sep 5, 2026ArrivedChattanoogaChicago
0
Sep 4, 2026ArrivedChattanoogaChicago
-7

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