How far in advance should I book a flight to get the best deal?

Related questions

1. Can I get cheap flights last minute?
2. Does Korean Air offer free stopover?
3. Why round trips are cheaper?
4. Can you check into a hotel late at night?
5. Is it cheaper to book two one way flights?
6. Are travel agents worth it?
7. What can I do with my IATA card?
8. Can you check into a hotel at 1am?
9. What is considered late check?
10. Can I buy a round trip ticket and only use one way?

Tags

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2. #prior
3. #prime
4. #departure
5. #cheapest
6. #during
7. #cheapair
8. #months
9. #attention
10. #window
11. #close
12. #exact
13. #which
14. #flight
15. #before
16. #airfare
17. #general
18. #three
19. #weeks
20. #recommends
21. #booking