How far in advance should I book an international flight to Europe?

Related questions

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3. How much should I budget per day Europe?
4. Do flights get cheaper day of?
5. Can you travel freely between European countries?
6. Can flight prices go down?
7. Are flights within Europe considered international?
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Tags

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2. #avoiding
3. #prior
4. #europe
5. #departure
6. #booked
7. #prepared
8. #travel
9. #flights
10. #south
11. #summer
12. #advance
13. #months
14. #during
15. #addition
16. #should
17. #trips
18. #however
19. #america