How far in advance should I book a flight to Europe?

Related questions

1. What is the best month to visit Germany?
2. Can you travel freely between European countries?
3. How much should I budget per day Europe?
4. How far in advance should I book an international flight to Europe?
5. Do EU countries stamp passports?
6. What is the best airline to fly to Europe from Australia?
7. Can flight prices go down?
8. Are flights within Europe considered international?
9. Do flights get cheaper day of?
10. What airlines fly within Europe?

Tags

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15. #america
16. #summer
17. #prior
18. #should
19. #booked