That’s an excellent and insightful question. While Google Flights is a dominant search and price comparison tool, it does not include every airline in the world. The airlines not on Google Flights generally fall into a few specific categories.
Here’s a breakdown of which airlines typically do not use Google Flights and why:
1. Ultra-Low-Cost Carriers (ULCCs) with Direct-Only Sales
These airlines avoid third-party distributors (including Google Flights) to save on commission fees and control the customer experience from start to finish. They want you on their website to sell you add-ons (bags, seats, priority boarding).
- Ryanair (Europe): The most famous example. They are adamant about selling only through their own website and app.
- Southwest Airlines (USA): Has never allowed its fares to be listed on any third-party metasearch or Online Travel Agency (OTA). You must book on Southwest.com.
- Allegiant Air (USA): Primarily direct sales, though they have limited partnerships with some vacation package sites.
- Volaris (Mexico): Similar model, focusing on direct sales.
2. Airlines with Complex Fare Structures or Bundles
Some airlines use fare bundles that are difficult for a standard comparison engine like Google Flights to parse accurately.
- Delta Air Lines (for Basic Economy): While Delta’s main fares are on Google Flights, they have at times restricted the display of their Basic Economy fares to their own channels to ensure customers see the fare rules before purchase.
- Many airlines’ “flight pass” or subscription products (e.g.,