Avianca: Colombia's flag carrier often offers competitive connections into Bogotá from U.S. hubs with Colombia-focused service and loyalty advantages for onward domestic travel. American Airlines: Strong U.S. connectivity via Miami (MIA) and Dallas (DFW), frequent one-stop options and consistent baggage policies, often competitive in October sales. United Airlines: Good connectivity via Houston (IAH) and Chicago (ORD) with extensive partner networks; consider United for MileagePlus benefits. Delta: Offers reliable service with connections through Atlanta (ATL) or Los Angeles (LAX). When comparing airlines in October, examine total travel time, baggage inclusions, and the risk of weather-related disruptions. CTA: Compare ONT to BOG fares across Avianca, American, United and Delta to find the best October itinerary for price and schedule.