United Cheap Flights from San Francisco to San Diego: UA SFO→SAN

View HK$615 flight on Sat, 17 Jan 2026Opens in a new window
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Prices were available within the past 7 days and start at HK$615 for one-way flights and HK$1,306 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, 12 Jan - Fri, 16 Jan
SFO
San Francisco
SAN
San Diego
HK$1,306 Return, found 1 day ago
HK$1,306
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from San Francisco to San Diego, returning Fri, 16 Jan, priced at HK$1,306 found 1 day ago
United
Mon, 12 Jan - Fri, 16 Jan
SFO
San Francisco
SAN
San Diego
HK$1,466 Return, found 1 day ago
HK$1,466
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from San Francisco to San Diego, returning Fri, 16 Jan, priced at HK$1,466 found 1 day ago
United
Fri, 9 Jan - Fri, 16 Jan
SFO
San Francisco
SAN
San Diego
HK$1,468 Return, found 2 days ago
HK$1,468
Return
found 2 days ago
Select United flight, departing Fri, 9 Jan from San Francisco to San Diego, returning Fri, 16 Jan, priced at HK$1,468 found 2 days ago
United
Mon, 12 Jan - Fri, 16 Jan
SFO
San Francisco
SAN
San Diego
HK$1,541 Return, found 1 day ago
HK$1,541
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from San Francisco to San Diego, returning Fri, 16 Jan, priced at HK$1,541 found 1 day ago
United
Mon, 12 Jan - Fri, 16 Jan
SFO
San Francisco
SAN
San Diego
HK$1,542 Return, found 1 day ago
HK$1,542
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from San Francisco to San Diego, returning Fri, 16 Jan, priced at HK$1,542 found 1 day ago
United
Mon, 12 Jan - Fri, 16 Jan
SFO
San Francisco
SAN
San Diego
HK$1,574 Return, found 1 day ago
HK$1,574
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from San Francisco to San Diego, returning Fri, 16 Jan, priced at HK$1,574 found 1 day ago

Find the cheapest month to fly from San Francisco (SFO) to San Diego (SAN)

January is typically the cheapest month to fly

From HK$373 - HK$908 per traveller.

Frequently asked questions

How much is a United Airlines flight from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
Apply the "Price (lowest to highest)" filter on Expedia to search for cheap United Airlines return flights from HK$1,306 from SFO to SAN. Affordable one-way fares from HK$615 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SFO to SAN with United Airlines?
Browse for return or one-way flights to San Diego in January or November. You could find lower fares with United Airlines during these off-season months.
Does United Airlines fly nonstop from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
United Airlines has direct flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN), with 41 departures each week. Just choose the "Nonstop" and "Airline" filters during your search on Expedia to show all direct United Airlines flights to SAN.
How long does it take to fly from SFO to SAN with United Airlines?
Take off from San Francisco Intl. Airport (SFO) for San Diego Intl. Airport (SAN) on a direct United Airlines flight, and you'll be in the air for about 1h 39m.
Which day of the week has the most United Airlines flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
United Airlines operates the most flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN) on Wednesday. With up to 6 daily departures, you'll get the most choice and flexibility on this day.
What airports does United Airlines fly into in San Diego?
Get on a United Airlines flight from San Francisco Intl. Airport (SFO) to San Diego, and you're most likely to arrive at San Diego Intl. Airport (SAN). This is the airline's main hub in this city.
What type of plane does United Airlines fly from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
For the San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN) route, United Airlines typically uses Boeing 737 MAX 8 and Boeing 737-800 planes. Remember that last-minute changes can occur for operational purposes, so your flight may be on another aircraft.
Can I change or cancel my United Airlines flight from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
Changes are usually free within 24 hours of making your booking, but your airline may charge a fee after that time. For more information about modifying your flights, head to your "Trips," select your flight and click on "Manage Booking." If you'd like the flexibility to change your itinerary without being charged, tick the "Changes included" and "No cancel fee" filters when planning your next trip.

Travel information

Origin airport
San Francisco Intl.
Destination airport
San Diego Intl.
Airlines serving
American Airlines, Delta, United
Popular airline
American Airlines
Distance
714 km
Average flight time
1 hour 31 mins

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