Is UA1665 delayed?

Each route and date is shown separately. Confirm that both airports match your booking.

Service date: Sep 8, 2026 · Scheduled departure date (America/Los_Angeles)

Arrived

45 min early

Official source · Updated Sep 9, 2026, 11:02 UTC

Departure

San Francisco

SFO

Actual

23:18~~23:21~~

Sep 8

Arrival

Boston

BOS

Actual

07:02~~07:48~~

Sep 9

Times shown in airport local time

Flight details

Departure · UTC

Scheduled: Sep 9, 2026, 06:21 UTC
Estimated: Not available
Actual: Sep 9, 2026, 06:18 UTC

Arrival · UTC

Scheduled: Sep 9, 2026, 11:48 UTC
Estimated: Not available
Actual: Sep 9, 2026, 11:02 UTC

Service date: Sep 8, 2026 · Scheduled departure date (UTC)

Arrived

3 min early

Official source · Updated Sep 8, 2026, 03:58 UTC

Departure

Ontario

ONT

Actual

02:52~~02:30~~

Sep 8

Arrival

San Francisco

SFO

Actual

20:47~~20:50~~

Sep 7

Times shown in airport local time

Flight details

Departure · UTC

Scheduled: Sep 8, 2026, 02:30 UTC
Estimated: Not available
Actual: Sep 8, 2026, 02:52 UTC

Arrival · UTC

Scheduled: Sep 8, 2026, 03:50 UTC
Estimated: Sep 8, 2026, 03:54 UTC
Actual: Sep 8, 2026, 03:47 UTC

Route overview

ONTSFO

Recent arrivals

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

Sat, Sep 19, 2026
SFO → BOS
17 min early
Fri, Sep 18, 2026
ONT → SFO
16 min late
Fri, Sep 18, 2026
SFO → BOS
12 min early
Thu, Sep 17, 2026
ONT → SFO
88 min late
Thu, Sep 17, 2026
SFO → BOS
42 min early

Flight history and details

Aug 20, 2026 — Sep 19, 2026

Observed arrivals: 23
Arrivals over 15 minutes late: 3
Observed cancellations: 0
Observed occurrences: 36

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

UA1665 Recent arrival history
Service date	Departure	Arrival	Actual	Arrival delay (minutes)
Sep 18, 2026Arrived	San Francisco	Boston	Sep 19, 2026, 11:51 UTC View this flight’s market	-17
Sep 19, 2026Arrived	Ontario	San Francisco	Sep 19, 2026, 04:06 UTC View this flight’s market	16
Sep 17, 2026Arrived	San Francisco	Boston	Sep 18, 2026, 11:56 UTC	-12
Sep 18, 2026Arrived	Ontario	San Francisco	Sep 18, 2026, 05:18 UTC	88
Sep 16, 2026Arrived	San Francisco	Boston	Sep 17, 2026, 11:26 UTC	-42
Sep 15, 2026Arrived	San Francisco	Boston	Sep 16, 2026, 10:54 UTC	-53
Sep 14, 2026Arrived	San Francisco	Boston	Sep 15, 2026, 11:45 UTC	-23
Sep 13, 2026Arrived	San Francisco	Boston	Sep 14, 2026, 11:25 UTC	-43
Sep 14, 2026Arrived	Ontario	San Francisco	Sep 14, 2026, 04:04 UTC	14
Sep 12, 2026Arrived	San Francisco	Boston	Sep 13, 2026, 11:26 UTC	-42
Sep 11, 2026Arrived	San Francisco	Boston	Sep 12, 2026, 11:48 UTC	-20
Sep 10, 2026Arrived	San Francisco	Boston	Sep 11, 2026, 11:38 UTC	-30
Sep 9, 2026Arrived	San Francisco	Boston	Sep 10, 2026, 11:22 UTC	-46
Sep 8, 2026Arrived	San Francisco	Boston	Sep 9, 2026, 11:02 UTC	-45
Sep 7, 2026Arrived	San Francisco	Boston	Sep 8, 2026, 11:54 UTC	-14
Sep 8, 2026Arrived	Ontario	San Francisco	Sep 8, 2026, 03:47 UTC	-3
Sep 6, 2026Arrived	San Francisco	Boston	Sep 7, 2026, 11:43 UTC	-25
Sep 5, 2026Arrived	San Francisco	Boston	Sep 6, 2026, 11:30 UTC	-43
Sep 4, 2026Arrived	San Francisco	Boston	Sep 5, 2026, 11:34 UTC	-39
Sep 5, 2026Arrived	Ontario	San Francisco	Sep 5, 2026, 03:31 UTC	-19
Sep 3, 2026Arrived	San Francisco	Boston	Sep 4, 2026, 12:09 UTC	-4
Sep 3, 2026Arrived	Ontario	San Francisco	Sep 4, 2026, 04:27 UTC	31
Sep 2, 2026Arrived	San Francisco	Boston	Sep 3, 2026, 11:10 UTC	-63