When should I buy plane tickets to Europe?

Related questions

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3. Why Flight tickets are so expensive?
4. Are flights cheap in Europe?
5. What is the cheapest month to fly to Europe?
6. Which is the most expensive country in Europe?
7. Is it cheaper to buy airline tickets together or separate?
8. Are flights within Europe cheap?
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10. When's the best time to buy international airline tickets?

Tags

1. #months
2. #travel
3. #month
4. #europe
5. #while
6. #before
7. #cheapest
8. #ticket
9. #between
10. #march
11. #coming
12. #expensive