$39 Cheap United flights San Francisco (SFO) to San Diego (SAN)

View $39 flight on Tue, Aug 12, 2025Opens in a new window

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$39 Cheap United flights San Francisco (SFO) to San Diego (SAN)

Prices were available within the past 7 days and start at $39 for one-way flights and $77 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Aug 12 - Tue, Aug 19
SFO
San Francisco
SAN
San Diego
$77 Roundtrip, found 8 hours ago
$77
Roundtrip
found 8 hours ago
Select United flight, departing Tue, Aug 12 from San Francisco to San Diego, returning Tue, Aug 19, priced at $77 found 8 hours ago
United
Tue, Aug 12 - Tue, Aug 19
SFO
San Francisco
SAN
San Diego
$77 Roundtrip, found 8 hours ago
$77
Roundtrip
found 8 hours ago
Select United flight, departing Tue, Aug 12 from San Francisco to San Diego, returning Tue, Aug 19, priced at $77 found 8 hours ago
United
Wed, Sep 3 - Wed, Sep 10
SFO
San Francisco
SAN
San Diego
$99 Roundtrip, found 1 hour ago
$99
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Sep 3 from San Francisco to San Diego, returning Wed, Sep 10, priced at $99 found 1 hour ago
United
Thu, Oct 2 - Fri, Oct 10
SFO
San Francisco
SAN
San Diego
$111 Roundtrip, found 12 hours ago
$111
Roundtrip
found 12 hours ago
Select United flight, departing Thu, Oct 2 from San Francisco to San Diego, returning Fri, Oct 10, priced at $111 found 12 hours ago
United
Wed, Aug 20 - Fri, Aug 22
SFO
San Francisco
SAN
San Diego
$116 Roundtrip, found 2 hours ago
$116
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Aug 20 from San Francisco to San Diego, returning Fri, Aug 22, priced at $116 found 2 hours ago
United
Tue, Aug 5 - Tue, Aug 12
SFO
San Francisco
SAN
San Diego
$119 Roundtrip, found 1 hour ago
$119
Roundtrip
found 1 hour ago
Select United flight, departing Tue, Aug 5 from San Francisco to San Diego, returning Tue, Aug 12, priced at $119 found 1 hour ago
Flights from San Francisco (SFO) to San Diego (SAN)
Origin airport
San Francisco Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
Alaska Airlines
Distance
446 mi
Average flight time
1 hour 30 mins

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 look for cheap United Airlines return flights from $77 from SFO to SAN. Affordable one-way fares from $39 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?
January is one of the least expensive months to jet away to San Diego with United Airlines. You could also find great prices on return and one-way tickets in November.
What is the cheapest time to book flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN) with United Airlines?
Begin your search one to three months before your departure to score cheaper fares on United Airlines flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
Hop on one of United Airlines's 41 weekly direct flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN). To see what's available, enter your destination, origin and dates and hit search. Next, apply the "Nonstop" and "Airline" filters.
How long does it take to fly from SFO to SAN with United Airlines?
From takeoff to arrival, a direct United Airlines flight from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN) typically takes 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 has 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 flexibility and choice on this day.
What is the earliest United Airlines flight from SFO to SAN?
Setting off from SFO at 8:30AM UTC-8, the earliest United Airlines flight to SAN lands at 10:09AM UTC-8. Traveling earlier in the day means you'll be less likely to experience delays.* Not an early riser? The last United Airlines flight from SFO to SAN departs at 10:35PM UTC-8 and touches down at 12:14AM UTC-8.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
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'll probably touch down at San Diego Intl. Airport (SAN). This is the airline's primary hub in this destination.
Why fly with United Airlines from SFO to SAN?
A rewarding loyalty program and the opportunity to collect points through United Mileage Plus are the start of the reasons to travel from SFO to SAN with United Airlines. Plus, by joining Expedia's free One Key™ program, you can receive OneKeyCash™* on top of any airline loyalty program earnings. It's yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
United Airlines usually flies Boeing 737 MAX 8 planes for flights from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN). This airline also operates the Boeing 737-800 on this route. Bear in mind that aircraft type can change due to operational needs, so the plane you board might be different on the day you travel.
Can I change or cancel my United Airlines flight from San Francisco Intl. Airport (SFO) to San Diego Intl. Airport (SAN)?
Changes are typically free within 24 hours of booking, but your airline may charge you after that. For more details about modifying your flights, go to your "Trips," select your flight and click on "Manage Booking." If you'd like the flexibility to change your itinerary without being charged, check the "No cancel fee" or "Changes included" filter when planning your next break.
*Available to One Key members.