Is UA2356 delayed?
Each route and date is shown separately. Confirm that both airports match your booking.
Service date: · Scheduled departure date (America/Los_Angeles)
22 min early
This update may be out of date. Check with your airline.
Update time unavailable
Departure
San Francisco
SFO
Actual
Aug 29
Arrival
Boston
BOS
Estimated
Aug 29
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
- Not available
Service date: · Scheduled departure date (America/Los_Angeles)
21 min early
Official source · Updated
Departure
Las Vegas
LAS
Actual
Aug 29
Arrival
San Francisco
SFO
Actual
Aug 29
Times shown in airport local time
Flight details
Departure · UTC
- Scheduled
- Estimated
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Actual
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 165 min late
SFO → BOS
- 36 min late
LAS → SFO
- 34 min late
SFO → BOS
- 6 min early
LAS → SFO
- 9 min early
SFO → BOS
Flight history and details
Aug 19, 2026 — Sep 18, 2026
- Observed arrivals
- 34
- Arrivals over 15 minutes late
- 17
- Observed cancellations
- 0
- Observed occurrences
- 53
Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Sep 17, 2026Arrived | San Francisco | Boston | 165 | |
| Sep 17, 2026Arrived | Las Vegas | San Francisco | 36 | |
| Sep 16, 2026Arrived | San Francisco | Boston | 34 | |
| Sep 16, 2026Arrived | Las Vegas | San Francisco | -6 | |
| Sep 15, 2026Arrived | San Francisco | Boston | -9 | |
| Sep 14, 2026Arrived | San Francisco | Boston | 30 | |
| Sep 14, 2026Arrived | Las Vegas | San Francisco | -29 | |
| Sep 13, 2026Arrived | San Francisco | Boston | 25 | |
| Sep 13, 2026Arrived | Las Vegas | San Francisco | -19 | |
| Sep 12, 2026Arrived | San Francisco | Boston | 40 | |
| Sep 12, 2026Arrived | Las Vegas | San Francisco | -15 | |
| Sep 11, 2026Arrived | San Francisco | Boston | -3 | |
| Sep 10, 2026Arrived | San Francisco | Boston | 98 | |
| Sep 9, 2026Arrived | San Francisco | Boston | 42 | |
| Sep 9, 2026Arrived | Las Vegas | San Francisco | -23 | |
| Sep 8, 2026Arrived | San Francisco | Boston | 33 | |
| Sep 7, 2026Arrived | San Francisco | Boston | 44 | |
| Sep 7, 2026Arrived | Las Vegas | San Francisco | -14 | |
| Sep 6, 2026Arrived | San Francisco | Boston | 258 | |
| Sep 6, 2026Arrived | Las Vegas | San Francisco | -20 | |
| Sep 5, 2026Arrived | Las Vegas | San Francisco | 66 | |
| Sep 4, 2026Arrived | San Francisco | Boston | 38 | |
| Sep 4, 2026Arrived | Las Vegas | San Francisco | -22 | |
| Sep 3, 2026Arrived | Las Vegas | San Francisco | -17 | |
| Sep 2, 2026Arrived | San Francisco | Boston | -2 | |
| Sep 2, 2026Arrived | Las Vegas | San Francisco | 30 | |
| Aug 31, 2026Arrived | Las Vegas | San Francisco | 56 | |
| Aug 30, 2026Arrived | Las Vegas | San Francisco | -23 | |
| Aug 29, 2026Arrived | Las Vegas | San Francisco | -21 | |
| Aug 28, 2026Arrived | Las Vegas | San Francisco | 54 | |
| Aug 27, 2026Arrived | Las Vegas | San Francisco | -14 | |
| Aug 26, 2026Arrived | Las Vegas | San Francisco | -16 | |
| Aug 24, 2026Arrived | Las Vegas | San Francisco | -28 |