Frontier AirlinesDepart13:14
Thu, Dec 31SAN → SFO
1h 57m · Direct
$51one way, per person
View deal
- Cheapest fare
- $18
- Cheapest month
- December
- Direct flights
- Yes
- Flight time
- 1h 40m
Frontier Airlines · Wed, Dec 9
from $18
Frontier Airlines and Alaska Airlines
740 km
Get a price alert
We'll email you when San Diego → San Francisco drops to your price. It's free, and you can stop any time.
Today's cheapest fare is $18. We'll send one email to confirm. See our privacy policy.
Cheapest month to fly from San Diego to San Francisco
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in December 2026
The lowest fares we've seen for each day, cheapest first.
Frontier AirlinesPlan the rest of your trip to San Francisco
Where to stay, what to do and getting around, from our travel partners.
About flights from San Diego to San Francisco
San Diego (SAN) and San Francisco (SFO) are about 740 km apart. Direct flights take around 1h 40m, and recent direct fares were with Frontier Airlines and Alaska Airlines. Over the next few months, one-way fares start from $18, and December 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from San Diego to San Francisco?
The cheapest one-way fare we've seen recently is $18 with Frontier Airlines, departing Wednesday, December 9, 2026. Over the coming months, the lowest fare in each month ranges from $18 to $112.
What is the cheapest month to fly from San Diego to San Francisco?
December 2026 currently has the lowest fares, from $18 one way.
Are there direct flights from San Diego to San Francisco?
Yes. Recent direct fares were with Frontier Airlines and Alaska Airlines.
How long is the flight from San Diego to San Francisco?
A direct flight takes about 1h 40m. San Diego and San Francisco are around 740 km apart.
Which airlines fly from San Diego to San Francisco?
Recent fares on this route were with Frontier Airlines and Alaska Airlines.
More cheap flights from San Diego
- San Diego to Las Vegasfrom $135
- San Diego to New Yorkfrom $154
- San Diego to Denverfrom $30
- San Diego to Phoenixfrom $97
- San Diego to Chicagofrom $106
- San Diego to Bostonfrom $101
- San Diego to Houstonfrom $51
- San Diego to Orlandofrom $105
- San Diego to Dallasfrom $89
- San Diego to Seattlefrom $68
- San Diego to San Josefrom $79
- San Diego to Santa Rosafrom $147