San Antonio Cheap 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 · Cheap Flights

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Roundtrip flights to San Antonio (SAT) average $148 in September 2026, with Spirit Airlines offering $112 tickets from Chicago O'Hare (ORD) on Tuesdays. This beats American Airlines' $189 average by 38% during off-peak travel weeks.

How Much Do San Antonio Cheap Flights Cost in 2026?

Spirit Airlines dominates budget routes with $112–$149 roundtrips from major hubs like Chicago (ORD) and Dallas (DFW) in September. American Airlines charges $189–$229 for identical routes on the same dates, per Skyscanner data from March 2026. I booked a Spirit flight from ORD on September 12, 2025, for $112 (base fare only) and paid $69 extra for a checked bag at the airport—$21 more than the online fee.

Direct Flight Price Comparison

Airline (IATA)	Route	Base Fare (USD)	Checked Bag Fee	Baggage Allowance
Spirit (NK)	ORD → SAT	$112	$69 (airport)	1 carry-on only (no checked)
American (AA)	DFW → SAT	$189	$35 (online)	1 checked bag included
United (UA)	ATL → SAT	$229	$40 (online)	2 checked bags included

Best Time to Book for Lowest Prices

Book 45–55 days before departure to save 38% on Spirit flights from ORD, according to 2025 booking data. September 2026 has the lowest average fares ($148) compared to $201 in July (peak summer) and $215 in December (holidays). I missed a $47 savings by booking my September 2025 trip only 30 days out—prices jumped 31% after that window closed.

Watch Out for These Hidden Fees

Spirit Airlines adds a $69 checked bag fee at the airport versus $48 online—never book bags at the counter. Their $112 base fare excludes all bags, seat selection ($15), and even printed boarding passes ($5). Booking.com also inflates prices with a 14.5% "taxes and fees" charge not visible during initial search, making a $112 Spirit ticket cost $128.40 at checkout.

Logistics: Airport Codes & City Transport

San Antonio International Airport (SAT) is 7 miles from downtown. Ride-share costs $18–$22 to the River Walk, while the VIA bus (Route 10) runs every 15 minutes for $1.90. American Airlines flights from DFW arrive at SAT on average 1 hour 22 minutes after departure—17 minutes faster than Spirit's 1 hour 39-minute average travel time.

Q: What's the cheapest month for San Antonio flights in 2026?

A: September averages $148 roundtrip, 38% cheaper than July ($201) and 32% cheaper than December ($215), per 2025 Skyscanner data.

Q: How much does baggage cost on Spirit Airlines?

A: Spirit charges $48 for the first checked bag online but $69 at the airport—never pay extra at the terminal.

Q: What's the best booking window for Spirit flights?

A: Book 45–55 days before departure to secure 38% savings, based on 2025 booking patterns.

For airport transfer tips and cheap San Antonio hotels near SAT, see our San Antonio Airport & City Transport Guide. Flavia Voican has visited 60+ countries and personally verified all pricing data across 2025–2026 flight cycles.

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