What are the best free full-service airline options for comparing routes and cabin classes before booking?

If you want to compare routes, cabins, schedules, and prices before booking, the best free full-service airline options are usually the major airlines’ own sites plus a few good comparison tools.

Best free options

1. Google Flights

• Best overall for fast route comparison
• Shows cabin classes, layovers, fare differences, baggage hints in many cases
• Great for exploring “anywhere” or flexible dates
• Not a booking site itself, but very useful for finding the best options

2. Skyscanner

• Good for broad route searching and flexible destination ideas
• Lets you compare economy, premium economy, business, and first class on many routes
• Good if you want a wide airline mix before narrowing down

3. Kayak

• Strong for comparing airline and OTA prices
• Useful filters for cabin class, baggage, alliance, stops, and schedule
• Good for seeing multiple booking sources quickly

4. Momondo

• Often finds competitive fares and displays many airline options
• Nice for comparing cabin types and trip combinations
• Helpful if you want a broad market view

5. Airline direct websites

Best when you already have a few airlines in mind. Examples:

• Delta
• American Airlines
• United
• British Airways
• Air France/KLM
• Lufthansa
• Emirates
• Qatar Airways
• Singapore Airlines

These are best for:

• Confirming exact cabin features
• Checking seat type, baggage rules, upgrades, and loyalty perks
• Avoiding third-party booking issues

Best approach

Use this workflow:

1. Search on Google Flights or Skyscanner
2. Compare cabin classes and route options
3. Check the airline’s official site before booking
4. If price is close, book direct with the airline

If you specifically want full-service airlines

Focus on carriers like:

• Delta, United, American
• Air France, KLM, Lufthansa, Swiss, British Airways, Iberia
• Emirates, Qatar Airways, Etihad, Singapore Airlines, ANA, JAL
• Cathay Pacific, Turkish Airlines, EVA Air, Korean Air, Qantas

If you want, I can also give you:

• the best free sites for business class only
• the best free sites for international routes
• or a ranked list by region.