How to predict flight prices — will fares go up or down?

Everyone wants to know if a fare will drop before they buy. The honest answer: prediction is a coin-flip dressed up as certainty - but there's a more reliable way to catch the low. Here's what actually works in 2026.

Short answer: You can't reliably predict a specific fare - airlines reprice constantly on signals no consumer tool fully sees, so Hopper and Google Flights give you probabilities, not guarantees. The dependable move is to stop predicting and start reacting: watch your exact route and buy when a fare drops well below its verified 90-day median.

By the Snagfly team
Updated 18 August 2026 · 6 min read

Key takeaways

You can't reliably predict a specific fare - airlines reprice constantly on demand signals no consumer tool fully sees.
Prediction tools (Hopper, Google Flights insights) give probabilities and history, not guarantees.
Seasonality is the one dependable signal - fares track demand calendars far more than any forecast.
The reliable move is to react, not predict - watch the route and buy when a fare drops well below its verified baseline.

Can you actually predict flight prices?

Not with real confidence. Airfares are set by revenue-management systems that reprice many times a day against demand, competition, seat inventory and events - inputs no consumer tool fully sees. Anyone promising to tell you a fare will drop is selling certainty that doesn't exist. What you can do is stack the odds and, more usefully, catch the drop when it happens.

What the prediction tools really do

Hopper gives a "buy now / wait" call with a confidence level, based on historical patterns for the route. It's a probability, and it's often wrong on any single trip.
Google Flights shows price history and a "prices are currently low/typical/high" note plus a date grid - useful context, not a forecast.
Fare trackers tell you when a price moved, not whether it will move again.

All of these are worth using as context. None reliably predicts the future price of your specific flight.

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The one signal that holds: seasonality

Fares track demand calendars more than anything a model spits out. "Will flights to Hawaii go down in price?" or "will flights to London get cheaper?" almost always comes down to season: prices ease in the off-peak and shoulder months for that route and climb into peak and holidays. Knowing a route's cheap window (see our destination guides for Hawaii, London and more) beats any short-term forecast.

React, don't predict

Because prediction is unreliable, the dependable strategy is to watch the route and pounce when a fare drops well below normal, whenever that happens. That's what Snagfly does: it measures every fare against the rolling 90-day median for your exact route and only alerts you when one is at least 50% below it. Instead of guessing whether Tuesday's price will fall by Friday, you get an email the moment a genuine 50-90%-off fare appears - capped at three a week - and you book directly with the airline.

Bottom line

You can't truly predict flight prices, and tools that claim to are giving you odds, not answers. Use price history and seasonality for context - then let an alert catch the actual drop on the routes you care about. Reacting to a verified low beats forecasting one every time.

FAQ

Can you predict flight prices?

Not reliably. Airlines reprice constantly using demand, competition and inventory data that no consumer tool fully sees, so any promise that a fare will drop is a probability at best. Tools like Hopper and Google Flights give useful context - price history and 'low/typical/high' signals - but not guarantees. The dependable approach is to watch a route and buy when a fare drops well below its normal price.

Will flights to Hawaii (or anywhere) go down in price?

It mostly depends on season, not short-term luck. Fares to a destination ease in its off-peak and shoulder months and rise into peak and holidays. For Hawaii, that means fares soften outside the summer and winter-holiday peaks. Rather than guess, watch the specific route - Snagfly alerts you when a fare drops at least 50% below the route's 90-day median, so you catch the low whenever it lands.

Is Hopper's price prediction accurate?

Hopper's buy/wait advice is based on historical patterns and comes with a confidence level, but it's a probability and is frequently wrong on any single trip - no tool can see everything airlines use to reprice. Treat it as one input, not a guarantee. A more reliable approach is to react to a verified fare drop on your route rather than trust a forecast.

How do I know if a fare will drop before I book?

You often can't know for sure. Instead of predicting, watch the route and let a threshold do the deciding: Snagfly emails you only when a fare falls at least 50% below the rolling 90-day median for that exact route, capped at three alerts a week. That turns 'will it drop?' into 'you'll be told when it does,' and you book directly with the airline.

Keep reading

Snagfly vs Hopper

Deal alerts vs price prediction.

Best time to book flights

What the 2026 data says.

What counts as a real deal

A clear filter for fare alerts.

About Snagfly

Snagfly is a wishlist-based flight deal alert service. You pin the destinations you want to fly to, and we watch those exact routes 24/7 - alerting you only when a fare drops at least 50% below its verified 90-day median, capped at three emails a week. We take no commission; you book directly with the airline.

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About this guide: Snagfly publishes this page and is one of the services discussed. It summarises common themes from public traveler discussion (including Reddit communities such as r/travel, r/Flights and r/Shoestring) as of August 2026; it does not quote or reproduce individual posts, and is not affiliated with or endorsed by Reddit, Inc. or any third party named here. Prices and product details change frequently - check live fares and current terms before booking. All third-party names and trademarks belong to their respective owners.