Flights Boston → San Antonio
As of October 2026, economy flights from Boston to San Antonio have a typical range USD 410–1284, median USD 553. Full range across all 140 offers: USD 404–1854. We found 35% of 140 offers from budget carriers (around USD 460) and 65% from full-service carriers (around USD 553).
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: Boston → San Antonio
Based on 140 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Boston → San Antonio
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Southwest Airlines | Included | Included | — |
| Southwest | — | USD 45 | — |
| Delta | Included | USD 35 | — |
| United | Included | USD 35 | — |
| American Airlines | Included | USD 35 | — |
| Alaska Airlines | 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 Boston to San Antonio cost?
Based on 140 offers · October 2026
Boston to San Antonio flights ranged from USD 404 to USD 1854 across 140 offers analyzed in October 2026. Two fare clusters detected: budget fares around 622 and premium fares around 1492 The chart below shows how prices distributed across all 140 offers.
These 140 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 485 and USD 554
What hidden fees do Boston to San Antonio flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Boston to San Antonio routes. The breakdown below is based on 140 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| WN | 18 | 4% |
| Southwest | 45 | 11% |
| DL | 31 | 3% |
| UA | 45 | 8% |
| AA | 48 | 9% |
| AS | 45 | 4% |
Southwest: base ~USD 365 + fees USD 45 = ~USD 410 total. Southwest Airlines: base ~USD 442 + fees USD 18 = ~USD 460 total.
Southwest's USD 45 ancillary fees narrow the gap with Southwest Airlines's lower-fee model — the USD 77 base difference shrinks to USD 50 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.AA charges 2.7x more in ancillary fees than WN on this route. Compare total-cost options when booking.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Boston to San Antonio?
6 airlines flew Boston to San Antonio in this dataset. The route shows a clear split between low-cost and full-service carriers. 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.
Even on the cheapest airline (Southwest), fares ranged USD 410–411 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Southwest | 19 | 410–411 | 410 | 45 (11%) |
 Southwest Airlines | 30 | 404–510 | 460 | 18 (4%) |
 Delta Air Lines | 35 | 553–1854 | 553 | 31 (6%) |
 United Airlines | 22 | 550–559 | 553 | 45 (8%) |
 American Airlines | 33 | 553–554 | 553 | 48 (9%) |
 Alaska Airlines | 1 | — | 1035 | 45 (4%) |
Where do the best Boston → San Antonio 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: Boston to San Antonio flights
- Full-service carriers on Boston–San Antonio cost 1.5x more than budget airlines (USD 674 vs USD 435 median; overall median USD 553).
- AA charges 2.7x more in ancillary fees than WN — USD 48 vs USD 18 avg per booking.
- The same route priced USD 144 apart depending on where it was booked — the lowest median was USD 410. 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 Boston to San Antonio cost?
- Based on 140 offers analyzed, Boston to San Antonio flights range from USD 404 to USD 1854, with a median price of USD 553. Search for your specific dates →
- What hidden fees should I expect on Boston to San Antonio flights?
- On average, ancillary fees (bags, seat selection) add USD 37 to the base fare on Boston to San Antonio flights. See itemized fees for your itinerary →
- Which airline is cheapest on Boston to San Antonio including all fees?
- Southwest has the lowest median fare on Boston to San Antonio at USD 410 (median across 19 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Boston–San Antonio 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 410. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Boston to San Antonio routes?
- Boston to San Antonio has 6 airlines competing, creating a price range from USD 404 to USD 1854 across 140 offers. There are two distinct fare clusters on this route: budget options and premium fares. Find where your trip lands in the distribution →
6 airlines, two price clusters — find which fits your budget
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