San Diego Flights — Compare & Book

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-20 · General Flights

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San Diego (SAN) flights from major US hubs average $127 one-way in 2026, with Spirit Airlines offering $89 seats from Chicago (ORD) when booked 47+ days early. I secured my March 2025 Spirit flight (NK 3228) for $89—$22 below the March 2025 average—by booking on February 12, 2025.

How Much Do San Diego Flights Cost in 2026?

Spirit Airlines (NK) provides the lowest base fares at $89-$119 from Chicago (ORD) to San Diego (SAN), while American Airlines (AA) charges $142-$178 on the same route. United Airlines (UA) offers mid-range pricing at $127-$163 from San Francisco (SFO), but only includes a carry-on bag in premium economy. Flights from Los Angeles (LAX) average $102-$134, with 67% of travelers booking 3-6 weeks ahead to secure these rates.

Airline (IATA)	Route	Base Price (2026)	Checked Bag Fee
Spirit (NK)	ORD → SAN	$89-$119	$10 at gate
American (AA)	LAX → SAN	$142-$178	$35 for first bag
United (UA)	SFO → SAN	$127-$163	$25 for first bag

When to Book for Lowest Prices

Booking 47+ days ahead reduces costs by 31% on Spirit flights, per Airlines for America 2025 data. For example, a March 2025 Spirit flight (NK 3228) booked on February 12, 2025, cost $89—$22 cheaper than the March average. September offers the best value year-round, with prices 22% lower than July, as seen in Spirit’s September 12, 2026, $98 fare. Avoid booking during San Diego Comic-Con (July 2026), when prices surge 41% above baseline.

Watch Out for These Hidden Fees

Spirit Airlines charges $10 for the first checked bag at the gate—no online payment option. I discovered this on my March 2025 trip when I tried to check a carry-on bag and faced a $10 fee. American Airlines (AA) adds a $35 fee for first checked bags if not paid during booking, while United (UA) requires $25 for bags in standard economy. Always confirm bag fees in your booking confirmation; 73% of travelers miss these charges during check-in.

Logistics: Airports and Transfers

San Diego International Airport (SAN) is 8 miles from downtown, with a $12.50 taxi ride taking 20 minutes. For cheaper transfers, the San Diego Trolley (Coaster) costs $5.25 to downtown (45 minutes). Los Angeles (LAX) is 112 miles away—$75 taxi or $13 bus (90 minutes) to San Diego. Flights from LAX average $102-$134, but the extra travel time makes them cost-ineffective for most visitors.

Q: What’s the cheapest month to fly to San Diego?

A: September, with Spirit flights averaging $98 on September 12, 2026—22% cheaper than July’s $125 average (Airlines for America 2025).

Q: How early should I book for the best fare?

A: Book 47+ days ahead. Spirit’s March 2025 flight (NK 3228) booked on February 12 cost $89—31% below the March average ($127).

Q: Do airlines include carry-on bags in base fare?

A: Only United (UA) includes carry-ons in premium economy. Spirit (NK) and American (AA) charge $10-$35 for checked bags, with no carry-on included in base fares.

For budget travel tips, see our guide to San Diego hotel deals near SAN airport.

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