Flights San Antonio → Seattle
As of October 2026, economy flights from San Antonio to Seattle have a typical range USD 205–1617, median USD 373. Full range across all 164 offers: USD 132–5913. We analyzed 164 offers from 8 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: San Antonio → Seattle
Based on 164 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: San Antonio → Seattle
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Frontier Airlines | — | — | — |
| United | Included | USD 35 | — |
| Southwest | — | USD 45 | — |
| American Airlines | Included | USD 35 | — |
| Southwest Airlines | Included | Included | — |
| Alaska Airlines | — | USD 35 | — |
| Delta | Included | USD 35 | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from San Antonio to Seattle cost?
Based on 164 offers · October 2026
San Antonio to Seattle flights ranged from USD 132 to USD 5913 across 164 offers analyzed in October 2026. The chart below shows how prices distributed across all 164 offers.
These 164 offers (October 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 280 and USD 613
What hidden fees do San Antonio to Seattle flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on San Antonio to Seattle routes. The breakdown below is based on 164 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| F9 | 10 | 3% |
| UA | 36 | 6% |
| Southwest | 45 | 22% |
| AA | 50 | 13% |
| WN | 0 | 0% |
| AS | 38 | 3% |
| DL | 43 | 3% |
American Airlines: base ~USD 314 + fees USD 50 = ~USD 364 total. Frontier Airlines: base ~USD 412 + fees USD 10 = ~USD 422 total.
American Airlines's USD 50 ancillary fees narrow the gap with Frontier Airlines's lower-fee model — the USD 98 base difference shrinks to USD 58 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from San Antonio to Seattle?
8 airlines flew San Antonio to Seattle in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Frontier | 1 | — | 138 | n/a |
 Southwest | 16 | 198–211 | 204 | 45 (22%) |
 Southwest Airlines | 42 | 229–400 | 325 | 0 (0%) |
 American Airlines | 27 | 300–447 | 364 | 50 (14%) |
 United Airlines | 32 | 257–990 | 397 | 36 (9%) |
 Frontier Airlines | 3 | 190–600 | 422 | 10 (2%) |
 Alaska Airlines | 10 | 327–3400 | 499 | 38 (8%) |
 Delta Air Lines | 33 | 468–2217 | 1199 | 43 (4%) |
Where do the best San Antonio → Seattle prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from travel agency sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: San Antonio to Seattle flights
- Full-service carriers on San Antonio–Seattle cost 2.3x more than budget airlines (USD 615 vs USD 272 median; overall median USD 373).
- AA charges 5.0x more in ancillary fees than F9 — USD 50 vs USD 10 avg per booking.
- The same route priced USD 394 apart depending on where it was booked — the lowest median was USD 204. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from San Antonio to Seattle cost?
- Based on 164 offers analyzed, San Antonio to Seattle flights range from USD 132 to USD 5913, with a median price of USD 373. Search for your specific dates →
- What hidden fees should I expect on San Antonio to Seattle flights?
- On average, ancillary fees (bags, seat selection) add USD 31 to the base fare on San Antonio to Seattle flights. See itemized fees for your itinerary →
- Which airline is cheapest on San Antonio to Seattle including all fees?
- Frontier has the lowest median fare on San Antonio to Seattle at USD 138 (median across 1 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest San Antonio–Seattle flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 204. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on San Antonio to Seattle routes?
- San Antonio to Seattle has 8 airlines competing, creating a price range from USD 132 to USD 5913 across 164 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
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