Delta, American Airlines, and United are common carriers on the ATL–SAN route via nonstop or connecting flights in October. Delta may offer more nonstop options when operating ATL hubs, while American and United provide competitive one-stop itineraries through their hubs (DFW, LAX, PHX). Compare primary keywords such as 'ATL to SAN flights' and secondary terms like 'Delta ATL SAN nonstop' while checking baggage fees, basic economy restrictions, and seat assignment rules. Loyalty benefits, lounge access, and preferred schedules should factor into your October booking decision. CTA: Compare airlines side-by-side for your travel dates and select the best balance of price and comfort.