I've booked hundreds of flights across six years of full-time travel. The difference between paying $900 and $340 for the same route often comes down to three things: flexibility, tools, and timing. Here's exactly what I use.

The Tools That Actually Work

Google Flights — Start Here, Always

Google Flights is free and consistently the most comprehensive search tool. The calendar view shows you the cheapest days of the month at a glance. The price tracking feature sends alerts when fares drop. The "Explore" map view shows you the cheapest destinations from your airport — this is how you discover unexpected cheap routes.

Scott's Cheap Flights / Going

A deal alert service (now called Going) that emails you when fares drop significantly — often 50–70% below normal prices. The free tier covers a few routes; the premium tier ($49/year) is worth it for frequent travelers. These are mistake fares and genuine flash sales, not marginal discounts.

Hopper

Hopper's main value is its price prediction feature: it tells you whether to book now or wait, based on historical price data. Not always right, but a useful second opinion when you're unsure.

The Timing Rules

When to Book Long-Haul Flights

For transatlantic or transpacific routes: 3–4 months out is the sweet spot for most routes. Beyond 6 months, prices are often higher than they'll be later. Within 3 weeks, prices spike dramatically except for specific last-minute deals.

When to Fly

Tuesday, Wednesday, and Saturday departures are consistently cheaper than Friday and Sunday. Red-eye flights are also typically cheaper — and you save a hotel night if you can sleep on planes.

Advanced Techniques

Hidden City Ticketing

Sometimes a flight from New York to Dallas with a stopover in Miami is cheaper than a direct New York–Miami flight. You book the Dallas ticket and get off in Miami. Legal, frowned upon by airlines, but practiced widely. Caveats: only works with carry-on luggage, and you can't check in online for the full route.

Open-Jaw Tickets

Flying into one city and out of another is often cheaper than a round-trip to the same city — and gives you more flexibility. London in, Paris out. Bangkok in, Singapore out.

Book Directly with Budget Airlines

Ryanair, Wizz Air, IndiGo, AirAsia — these carriers often don't appear on aggregators or charge a premium through them. Always check the airline's own site as a final price comparison.

  • Best ToolGoogle Flights
  • Best Deal Alert ServiceGoing (Scott's Cheap Flights)
  • Best Day to BookTuesday or Wednesday
  • Long-Haul Sweet Spot3–4 months ahead
  • Short-Haul Sweet Spot6–8 weeks ahead

The Most Overlooked Tip

Check nearby airports. Flying from London Gatwick instead of Heathrow, or from Newark instead of JFK, can save $100–200 on the same route. On the arrival side, flying into a secondary airport and taking a train or bus is often dramatically cheaper — especially in Europe where regional airports serve budget carriers that don't fly into major hubs.