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United Airlines

Is UA9721 delayed?

Service date: · Scheduled arrival date; departure time unavailable (Europe/Zurich)

Arrived

20 min early

Official source · Updated

Departure

Boston

BOS

Scheduled

Not available

Arrival

Zurich

ZRH

Actual

Scheduled 10:55

Sep 7

Times shown in airport local time

Flight details

Departure · UTC

Scheduled
Not available
Estimated
Not available
Actual
Not available

Arrival · UTC

Scheduled
Estimated
Actual

Operating flight: SWR53

Route overview: Boston → ZurichBOSZRH
Route overview

Recent arrivals

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

  • BOS → ZRH

    5 min late

  • BOS → ZRH

    <1 min early

  • BOS → ZRH

    15 min late

  • BOS → ZRH

    14 min early

  • BOS → ZRH

    22 min late
Flight history and details

Aug 22, 2026 — Sep 21, 2026

Observed arrivals
15
Arrivals over 15 minutes late
6
Observed cancellations
0
Observed occurrences
15

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

UA9721 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Sep 21, 2026ArrivedBostonZurich
5
Sep 20, 2026ArrivedBostonZurich
0
Sep 19, 2026ArrivedBostonZurich
15
Sep 18, 2026ArrivedBostonZurich
-14
Sep 16, 2026ArrivedBostonZurich
22
Sep 15, 2026ArrivedBostonZurich
2
Sep 14, 2026ArrivedBostonZurich
16
Sep 13, 2026ArrivedBostonZurich
19
Sep 12, 2026ArrivedBostonZurich
-17
Sep 11, 2026ArrivedBostonZurich
12
Sep 9, 2026ArrivedBostonZurich
3
Sep 7, 2026ArrivedBostonZurich
-20
Sep 6, 2026ArrivedBostonZurich
6
Sep 5, 2026ArrivedBostonZurich
17
Sep 4, 2026ArrivedBostonZurich
22

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