Flights Chicago → San Antonio
As of November 2026, economy flights from Chicago to San Antonio have a typical range USD 351–899, median USD 487. Full range across all 67 offers: USD 293–1617. We found 24% of 67 offers from budget carriers (around USD 459) and 76% from full-service carriers (around USD 493).
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: Chicago → San Antonio
Based on 67 offers · November 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Chicago → San Antonio
Add-on pricing from the cheapest available offer per airline · November 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| United | — | USD 50 | — |
| American Airlines | — | USD 55 | — |
| United | — | USD 50 | — |
| Delta | — | USD 45 | — |
| American | — | USD 50 | — |
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 Chicago to San Antonio cost?
Based on 67 offers · November 2026
Chicago to San Antonio flights ranged from USD 293 to USD 1617 across 67 offers analyzed in November 2026. Two fare clusters detected: budget fares around 492 and premium fares around 889 The chart below shows how prices distributed across all 67 offers.
These 67 offers (November 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 403 and USD 683
What hidden fees do Chicago to San Antonio flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Chicago to San Antonio routes. The breakdown below is based on 67 offers analyzed in November 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| United | 50 | 13% |
| AA | 50 | 9% |
| UA | 47 | 10% |
| DL | 46 | 5% |
| American | 50 | 11% |
United: base ~USD 353 + fees USD 50 = ~USD 403 total. Delta Air Lines: base ~USD 853 + fees USD 46 = ~USD 899 total.
United's USD 50 ancillary fees narrow the gap with Delta Air Lines's lower-fee model — the USD 500 base difference shrinks to USD 496 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 are relatively consistent across carriers on this route.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Chicago to San Antonio?
6 airlines flew Chicago 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 (Frontier), fares ranged USD 351–366 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) |
|---|---|---|---|---|
 Frontier | 3 | 351–366 | 366 | n/a |
 United | 12 | 336–403 | 403 | 50 (12%) |
 American | 1 | — | 459 | 50 (11%) |
 American Airlines | 23 | 317–683 | 493 | 50 (10%) |
 United Airlines | 14 | 469–508 | 493 | 47 (10%) |
 Delta Air Lines | 14 | 449–1421 | 899 | 46 (5%) |
Where do the best Chicago → 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: Chicago to San Antonio flights
- Full-service carriers on Chicago–San Antonio cost 1.5x more than budget airlines (USD 550 vs USD 366 median; overall median USD 487).
- United charges 1.1x more in ancillary fees than DL — USD 50 vs USD 46 avg per booking.
- The same route priced USD 90 apart depending on where it was booked — the lowest median was USD 403. 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 Chicago to San Antonio cost?
- Based on 67 offers analyzed, Chicago to San Antonio flights range from USD 293 to USD 1617, with a median price of USD 487. Search for your specific dates →
- What hidden fees should I expect on Chicago to San Antonio flights?
- On average, ancillary fees (bags, seat selection) add USD 48 to the base fare on Chicago to San Antonio flights. See itemized fees for your itinerary →
- Which airline is cheapest on Chicago to San Antonio including all fees?
- Frontier has the lowest median fare on Chicago to San Antonio at USD 366 (median across 3 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Chicago–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 403. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Chicago to San Antonio routes?
- Chicago to San Antonio has 6 airlines competing, creating a price range from USD 293 to USD 1617 across 67 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
Find flights for my datesNew route — be among the first to track this itinerary
Building with flight data? Power your app or agent with LetsFG
The same multi-source search behind this page — every airline and the major booking sites, deduplicated and ranked — is available to your app or AI agent. Natural-language or structured queries, live prices, zero price bias.
Try the free sandbox — no card →Free sandbox, instant fake results · email for a key · Bearer-token auth · MCP, Python & JS SDKs · letsfg.co/developers