QUICK ANSWER
Airlines sell each flight in fare buckets at different prices. Cheaper buckets sell out first, so prices usually rise as the flight fills and the date approaches. For most trips, booking a few weeks to a few months ahead and staying flexible on dates gets better fares than waiting for a last-minute deal.
Why prices keep changing
Airlines use revenue management systems that adjust fares based on how many seats are left, how fast they’re selling, competitor prices and the time until departure. When a cheaper fare class sells out, the next one up becomes the lowest price.
What pushes fares up or down
| Factor | Effect |
|---|---|
| Peak dates, holidays, school breaks | Higher |
| Booking very close to departure | Usually higher |
| Flexible dates and off-peak days | Often lower |
| More airlines on the route | Often lower |
| Fuel costs and taxes | Can raise base fares and surcharges |
Practical booking tips
- Use flexible-date search to compare nearby days.
- Set price alerts and watch the route for a while before buying.
- Check nearby airports for both departure and arrival.
- Compare the airline’s own site with travel sites.
- Factor in bags and seat selection when comparing cheap fares.
Myths worth ignoring
There’s no single magic day of the week that’s always cheapest, and clearing your browser cookies doesn’t reliably lower fares. Prices mostly change because of demand and remaining seats.
Frequently asked questions
Do fares drop at the last minute?
Sometimes on routes that aren’t selling, but more often they rise as seats fill. It’s a gamble.
Is it cheaper to book two one-way tickets?
Sometimes, especially with low-cost airlines. Compare both options.
What about refunds if prices drop?
It depends on the fare rules. Some airlines offer credits for fare differences on flexible tickets.
Sources
- IATA (International Air Transport Association): airline industry data