Informational Guide to San Francisco Airport (SFO) - NON OFFICIAL

UA1639 United Airlines - Flight Status

Below, you can find details about United Airlines flight UA1639, which currently operates between the airports of San Luis Obispo - San Luis Obispo County Regional Airport (Airport Code SBP) and San Francisco - San Francisco International Airport (Airport Code SFO).
This flight data pertains specifically to the flight's details for Monday, April 20, 2026.

UA1639 On Time performance:
87
We have calculated the percentage of flights that arrived within 15 minutes of their scheduled time, or earlier, based on real flight data from the last 3 months. More about punctuality and delays

Flight Status

UA1639 United Airlines from San Luis Obispo

Scheduled - On-time
Flight Status for Monday April 20, 2026
This flight was also scheduled for Yesterday (April 18, 2026). See it here
This flight is also scheduled for Today (April 19, 2026). See it here

Airline information

United Airlines
United Airlines
Equipment: Airbus A319

Departure

San Luis Obispo (SBP)
April 20, 2026
San Luis Obispo County Regional Airport
Estimated Departure Time:
06:15 am
Terminal:
-
Gate:
-
Scheduled Departure Time: 06:15 am

Arrival

San Francisco (SFO)
April 20, 2026
San Francisco International Airport
Estimated Arrival Time:
07:20 am
Terminal:
3
Gate:
-
Scheduled Arrival Time: 07:20 am
Disclaimer
The information displayed on this website is gathered from third-party providers with a wide reputation on the sector, which in turn obtain the information from the airlines. This data is provided only for informative purposes. www.airport-sfo.com assumes no responsibility for loss or damage as a result of relying on information posted here. Please contact your airline to verify flight status.

Additional Information

Which is the frequency of flight UA1639?
The flight UA1639 is scheduled to flight on daily basis.

Which is the distance of flight UA1639?
The distance between the two airports is 191 miles.

Which is the flight time of flight UA1639?
The scheduled flight time gate to gate is: 01:05 hours.
The real flight time gate to gate on average is: 01:06 hours.

Are the departure airport and arrival airport at the same Time Zone?
Yes, both airports are in the same timezone.

Alternative Flights

The following airline serve the same route between San Luis Obispo and San Francisco:
United Airlines - Flight Number: UA5951. (On Time performance: 62 - Average Delay: 20 minutes)

Punctuality and delays

We have gathered data from recent months and present below an analysis of how timely the flights have been.

In terms of On-Time Performance, by analyzing the flight data from the last three months, spanning from March 29, 2026 to April 12, 2026, we have obtained these figures.
Total number of flights: 15
On Time: 13 ( 87 % )
Moderate Delay: 1 ( 7 % )
Significant Delay: 1 ( 7 % )
Major Delay: 0 ( 0 % )
Canceled: 0 ( 0 % )
Diverted: 0 ( 0 % )

Average Delay: 9 minutes.
Delays analyzed by Week: It is not possible to calculate the On-Time Performance for this flight accurately by weekday due to insufficient or non-representative data, as doing so could lead to misleading conclusions
Delays analyzed by Month: It is not possible to calculate the On-Time Performance for this flight accurately by month due to insufficient or non-representative data, as doing so could lead to misleading conclusions

Last Past Flights UA1639

Date
Departure
Arrival
Duration
Aircraft
Status
Saturday
18 April
06:22 am
San Luis Obispo (SBP)
07:26 am
San Francisco (SFO)
01h 04min
Airbus A319
Airbus A319
Landed - On-time
Friday
17 April
06:08 am
San Luis Obispo (SBP)
07:05 am
San Francisco (SFO)
00h 57min
Airbus A320
Airbus A320
Landed - On-time
Thursday
16 April
06:13 am
San Luis Obispo (SBP)
07:06 am
San Francisco (SFO)
00h 53min
Airbus A319
Airbus A319
Landed - On-time
Wednesday
15 April
06:18 am
San Luis Obispo (SBP)
07:16 am
San Francisco (SFO)
00h 58min
Airbus A319
Airbus A319
Landed - On-time
Tuesday
14 April
06:10 am
San Luis Obispo (SBP)
07:23 am
San Francisco (SFO)
01h 13min
Airbus A320
Airbus A320
Landed - On-time
Monday
13 April
06:15 am
San Luis Obispo (SBP)
07:14 am
San Francisco (SFO)
00h 59min
Airbus A319
Airbus A319
Landed - On-time
Sunday
12 April
06:32 am
San Luis Obispo (SBP)
07:30 am
San Francisco (SFO)
00h 58min
Airbus A319
Airbus A319
Landed - On-time
Saturday
11 April
06:14 am
San Luis Obispo (SBP)
07:29 am
San Francisco (SFO)
01h 15min
Airbus A319
Airbus A319
Landed - On-time
Friday
10 April
06:19 am
San Luis Obispo (SBP)
07:26 am
San Francisco (SFO)
01h 07min
Airbus A319
Airbus A319
Landed - On-time
Thursday
09 April
06:27 am
San Luis Obispo (SBP)
07:28 am
San Francisco (SFO)
01h 01min
Airbus A319
Airbus A319
Landed - On-time