For most trips, the sweet spot is to book neither super early nor last minute: roughly 1–3 months ahead for domestic flights and 2–8 months ahead for international flights, adjusting earlier for holidays and peak seasons.

Core timing guidelines

  • Domestic economy flights:
    • Aim to buy about 1–3 months before departure for typical trips.
* Many analyses find good prices between roughly 20–60 days out, with some data showing averages around 30–45 days.
  • International economy flights:
    • Start tracking prices about 6–7 months out and try to book 3–5 months before departure.
* Some guides broaden this to a 2–8 month “Goldilocks window,” especially for long‑haul routes.
  • Peak seasons and major events:
    • For Christmas/New Year, mid‑June–August, big festivals, or sports events, shift earlier: often 4–6 months out for domestic and 6–9 months out for international can be safer.

Why not book super early?

  • Airlines usually open schedules about 10–11 months ahead, but prices that far out often aren’t the lowest; later “sale” fares may appear closer in.
  • You trade away flexibility: plans, job situations, and routes can change, and change fees or fare differences can wipe out early‑booking “savings.”

When to book even earlier

  • Using miles/points:
    • Award seats are capacity‑controlled, so snapping them up as soon as schedules open (often 10–11 months ahead) is common advice.
  • Very popular long‑haul trips:
    • For Europe, many experts suggest booking about 3–6 months in advance; for Asia/Oceania, 5–7 months ahead can work better due to heavier demand and fewer ideal routings.

Practical booking strategy

  • Start watching fares early:
    • For domestic: begin tracking about 3–4 months before the trip, then pounce when prices dip in that 1–3 month window.
* For international: track 6–7 months out and buy once you see a good fare in the 3–5 (or 2–8) month span, especially if your dates aren’t flexible.
  • Use alerts and flexible dates:
    • Tools that show month‑view calendars and price alerts help catch dips; midweek departures (Tue–Thu) are often cheaper than weekends.

Forum & “latest news” angle

Recent travel‑hacker discussions still lean toward booking in the 1–3 month (domestic) and 3–6+ month (international) ranges, but many posters stress flexibility over chasing a mythical perfect day. Some also note that myths like “always buy on Tuesday” or “delete cookies for cheaper fares” are largely outdated under modern dynamic pricing.

TL;DR:
If you want one simple rule for “how far out should you book a flight,” aim for about 1–3 months ahead for domestic trips and 3–5 months (within a broader 2–8 month band) for international, and push earlier if you’re traveling during holidays, school breaks, or on very popular long‑haul routes.

Information gathered from public forums or data available on the internet and portrayed here.