Best Flights starting from $123
from$123economy
Seattle (SEA)
Sat, Sep 5
One-way
San Antonio (SAT)
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from$123economy
Seattle (SEA)
Wed, Sep 9
One-way
San Antonio (SAT)
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from$123economy
Seattle (SEA)
Thu, Sep 10
One-way
San Antonio (SAT)
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from$128economy
Seattle (SEA)
Fri, Sep 4
One-way
San Antonio (SAT)
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from$150economy
Seattle (SEA)
Sun, Sep 6
One-way
San Antonio (SAT)
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from$150economy
Seattle (SEA)
Tue, Sep 8
One-way
San Antonio (SAT)
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from$151economy
Seattle (SEA)
Mon, Sep 7
One-way
San Antonio (SAT)
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Other Options for This Route
Other Destinations
Seattle (SEA) to Lincoln (LNK) in September from $138
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Seattle (SEA) to New York (JFK) in September from $178
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Seattle (SEA) to San Diego (SAN) in September from $183
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Seattle (SEA) to Anchorage (ANC) in September from $210
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Seattle (SEA) to Sacramento (SMF) in September from $225
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Seattle (SEA) to Houston (IAH) in September from $285
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Flights from Other Cities
Chicago (Any) to San Antonio (SAT) in September from $122
From $122
Cleveland (Any) to San Antonio (SAT) in September from $284
From $284
Rochester (ROC) to San Antonio (SAT) in September from $407
From $407
Milwaukee (MKE) to San Antonio (SAT) in September from $427
From $427
Ontario (ONT) to San Antonio (SAT) in October from $72
From $72
Chicago (Any) to San Antonio (SAT) in October from $122
From $122
✈️ Flight Guide: Seattle (SEA) → San Antonio (SAT)
Complete travel information for your September journey
September is a shoulder travel month at Seattle-Tacoma International Airport (SEA): after Labor Day crowding diminishes and fares to many domestic destinations, including San Antonio (SAT), often show midweek discounts. Expect regular LINK light rail service into downtown Seattle, full lounge operations, and manageable TSA lines except around major holiday weekends. For best prices on SEA to SAT flights in September, search midweek, compare nonstop versus one-stop itineraries, and book 3–6 weeks in advance. CTA: Compare Seattle to San Antonio flights now and lock in September savings.
Departing from Seattle (SEA) FAQs
For domestic flights from Seattle-Tacoma International Airport (SEA) to San Antonio International Airport (SAT) in September, arrive at least 90 minutes before departure for carry-on only and 2 hours if you have checked bags. Early September can still have summer-level crowds around Labor Day, while mid-to-late September typically sees lighter security lines — checking real-time TSA wait times and online check-in will speed your journey.
Nonstop service between Seattle-Tacoma International Airport (SEA) and San Antonio International Airport (SAT) is seasonal and depends on airline schedules; in many Septembers you can find at least one or two nonstop options, while other carriers operate one-stop itineraries. Use fare comparison tools, filter for 'nonstop', and book early to secure direct Seattle to San Antonio flights in September shoulder season.
Seattle-Tacoma International Airport (SEA) offers LINK light rail connections to downtown Seattle, ride-shares, taxis, shuttles, and on-site public parking ideal for starting a September trip to San Antonio. Allow extra time for LINK or rideshare pick-up during Labor Day weekend and morning commuter hours, and consider pre-booking an airport shuttle if you need guaranteed punctuality to your SEA terminal.
Seattle in September usually transitions from summer to milder fall weather with average highs in the high 60s°F (around 18–20°C) and lower rainfall than October; fog or seasonal storms are uncommon but possible. Weather delays at Seattle-Tacoma International Airport (SEA) are less frequent in September than in winter, though always monitor forecasts before flying to San Antonio and opt for refundable fares if your travel dates are fixed.
Yes — Seattle-Tacoma International Airport (SEA) has multiple airline lounges, restaurants, and shops open throughout September; many reopen or extend hours after busy summer months. If you need a quiet workspace or priority boarding before your flight to San Antonio, consider purchasing a day pass to an SEA lounge or verifying airline lounge access ahead of travel.
From Seattle-Tacoma International Airport (SEA) you can quickly access Bellevue, Tacoma, Everett, and even Vancouver, BC for extended itineraries, making September an excellent month for Pacific Northwest stops before or after your flight to San Antonio. These nearby destinations offer easy transit connections or short drives and are popular search modifiers for travelers looking to combine regional trips with longer domestic flights.
Arriving at San Antonio International Airport (SAT) in September offers warm, mostly dry weather and generally manageable airport operations. Plan rideshares or rental cars for flexible travel to the River Walk, The Alamo, Texas Hill Country, or Austin; expect extra local traffic around Sept 16 for Fiestas Patrias celebrations. September is often a value month for hotels and tours, so book transport and accommodations early to secure the best deals. CTA: Find the best flights from Seattle to San Antonio this September and reserve ground transport from SAT.
Arriving at San Antonio (SAT) FAQs
From San Antonio International Airport (SAT) the most common options to downtown are rideshare services, taxis, or rental cars; shared shuttles and VIA Metropolitan Transit buses are available too. In September, expect warm weather and lower tourist crowds than summer, so rideshare wait times are typically short — book a rideshare or reserve a rental car in advance for the best rates.
San Antonio International Airport (SAT) has a single consolidated terminal with efficient baggage handling and short walking distances between gates; September arrivals often face quick baggage retrieval and fewer peak-season delays. If traveling during a local event like Mexican Independence Day (Sept 16), allow extra time for passenger throughput and consider mobile baggage tracking if available.
Public transit direct to Austin or Corpus Christi is limited from San Antonio International Airport (SAT); most travelers use rental cars, intercity buses, or regional flights for those legs. For trips to Austin (about 80 miles) or Corpus Christi (about 140 miles), consider renting a car at SAT or booking a shuttle/intercity bus for scheduled regional departures in September.
September in San Antonio often includes patriotic and cultural observances around Mexican Independence Day (Fiestas Patrias) on September 16, producing localized celebrations and increased hotel demand in popular areas. While large-scale city-wide festivals are less common in September compared with spring, expect some neighborhood events and plan extra travel time to reach downtown attractions from San Antonio International Airport (SAT) during holiday evenings.
San Antonio International Airport (SAT) provides easy access to the River Walk, The Alamo, the Texas Hill Country (Fredericksburg, New Braunfels), Austin, and regional Gulf Coast cities like Corpus Christi. September's warm weather makes Hill Country wine tours and outdoor attractions ideal — consider renting a car at SAT to explore nearby destinations with flexibility.
San Antonio International Airport (SAT) typically sees lighter passenger volumes in September compared to peak summer months, though demand can spike around holiday weekends and Sept 16 celebrations. You can often find more affordable fares and shorter lines in September — but always check flight status and allow time for baggage and ground transportation after arrival.
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September Events & Festivals Affecting SEA → SAT Travel
Seattle often hosts Labor Day weekend events and music festivals like Bumbershoot in early September, as well as the Mariners' late-season baseball games that can increase airport traffic at SEA. San Antonio celebrates Mexican Independence Day (Fiestas Patrias) around Sept 16 with parades and cultural events that raise demand near SAT and downtown hotels. These events can cause fare increases and limited accommodation availability; book early and consider arriving a day before major festivities. CTA: Check event dates and secure flights and hotels for September travel from SEA to SAT.
Best Time to Fly from Seattle (SEA) to San Antonio (SAT) — September Insights
The best time to fly Seattle-Tacoma International Airport (SEA) to San Antonio International Airport (SAT) in September is midweek (Tues–Thurs) and during early morning hours to avoid weekend premium pricing and higher passenger volumes. Book 3–6 weeks ahead for domestic September routes; last-minute deals are possible but riskier around Sept 16 celebrations. If you have flexibility, compare departure dates within a +/- 3 day window to capture the lowest fares. CTA: Use flexible date searches to identify the cheapest September flights between SEA and SAT and book today.
Direct vs Connecting Flights — SEA to SAT in September
Nonstop flights between Seattle-Tacoma International Airport (SEA) and San Antonio International Airport (SAT) offer the fastest door-to-door time (about 4.5–5 hours) and fewer disruption risks—ideal for tight schedules. Connecting flights can be significantly cheaper and provide more schedule options in September but increase the potential for missed connections and longer total travel time. For September travel, weigh cost savings against layover length and choose connections with at least a 60–90 minute buffer at major hubs. CTA: Filter searches by nonstop if time is your priority or compare connecting itineraries to save on SEA–SAT September fares.
Airline Comparison for SEA → SAT Flights in September
Major carriers serving the SEA–SAT route in varying capacities include national and legacy airlines offering nonstop or one-stop service. Low-cost carriers may offer lower base fares but charge for bags and seat selection; legacy carriers typically include more amenities and better schedule consistency. In September, compare total trip cost including baggage and seat fees, and factor in frequent flyer status or alliance benefits that can add value. CTA: Compare airline fares and baggage policies now to pick the best carrier for your September SEA to SAT trip.
Seasonal Travel Tips for Seattle to San Antonio in September
September travel from Seattle-Tacoma International Airport (SEA) to San Antonio International Airport (SAT) requires packing for cool, possibly drizzly mornings in Seattle and warm, humid afternoons in San Antonio. Layering is essential: bring a light waterproof jacket for SEA and breathable clothing for SAT. Book midweek flights to save on fares, monitor airline schedule updates for late summer weather changes, and confirm ground transport for arrival to avoid waits. CTA: Pack smart and book flexible September tickets for your SEA to SAT trip now.
Flight Time and Schedules — Seattle-Tacoma (SEA) to San Antonio (SAT) in September
Nonstop flights from Seattle-Tacoma International Airport (SEA) to San Antonio International Airport (SAT), when available, average about 4 hours 45 minutes to 5 hours depending on winds and routing. One-stop itineraries via hubs (e.g., Dallas, Houston, Phoenix) typically total 6–8 hours including layovers. For September travel, early morning departures minimize weather-related delay risk and maximize same-day arrival options; red-eye or late-night flights can be cheaper but offer fewer ground transport choices on arrival. CTA: Check schedules now and filter for nonstop or optimal connection times for your September trip.
Find Cheap Flights from Seattle-Tacoma (SEA) to San Antonio (SAT) in September
To find cheap flights from Seattle-Tacoma International Airport (SEA) to San Antonio International Airport (SAT) in September, search midweek departures (Tuesday–Thursday) and book roughly 3–6 weeks in advance for the best mix of price and availability. Set fare alerts on multiple platforms, check competing nearby airports (Seattle area alternatives and San Antonio area connections), and be open to one-stop itineraries that can significantly reduce cost. Use location-based keywords when searching, e.g., "Seattle to San Antonio cheap flights September" or "SEA SAT flight deals Sept". CTA: Sign up for fare alerts now and lock in low-cost September fares between SEA and SAT.