How to Track Flight Prices After Booking (5 Methods Compared)

Most flight price tools are designed to help you find the best fare before you buy. But the real savings opportunity often comes after you've already booked. With most airlines having dropped change fees, catching a post-booking price drop means free money — if you know it happened. Here are five ways to monitor your fare after purchase, ranked from least to most effective.

Why tracking after booking matters

As we covered in our guide to how airline pricing works, fares fluctuate constantly based on demand, competition, and how full the flight is. A meaningful price drop between booking and departure is common. The problem is that airlines have zero incentive to tell you about it. If you don't notice, they keep the difference.

Once you do spot a drop, the rebooking process is usually straightforward — cancel and rebook at the lower fare, and the difference lands in your account as a travel credit. The hard part is the monitoring itself.

Method 1: Manual checking

How it works: You go to the airline's website or a search engine like Google Flights every few days, search for your exact route and date, and compare the current price to what you paid.

Pros: Free, no tools required, and you see the exact current fare.

Cons: Tedious and easy to forget. Most people check once or twice and then stop. You also need to remember the exact fare you paid to know whether the current price is actually lower. If you're tracking multiple flights for a trip, the effort compounds quickly.

Best for: A single flight with a long booking window where you're motivated enough to check regularly.

Method 2: Google Flights price alerts

How it works: Google Flights lets you "track" a route and sends email alerts when prices change. You search your origin, destination, and dates, then toggle the tracking switch.

Pros: Free, automated, and backed by comprehensive fare data.

Cons: Google Flights alerts are designed for pre-booking research. They tell you when fares are "low" or "high" relative to historical trends — not whether the current price is below what you specifically paid. There's no way to input your purchase price, so you still have to manually compare every alert against your booking. Alerts also tend to be inconsistent in frequency, and Google may stop sending them as your departure date approaches. For a full breakdown, see our Google Flights tracking guide.

Best for: Pre-booking price research. Less useful once you've already purchased.

Method 3: Airline apps and notifications

How it works: Some airline apps show fare information for your booked flight. A few — most notably Delta — have experimented with in-app notifications when your fare drops.

Pros: Built into the tool you already use to manage your trip. When it works, it's seamless.

Cons: Inconsistent across airlines and not something you can rely on. Most airline apps don't actively notify you of price drops. Even when they do, it's typically limited to certain fare classes or booking channels. United's app, for instance, shows your trip details but doesn't alert you if the same flight gets cheaper. You're still on your own to check.

Best for: A nice bonus if your airline happens to offer it, but not a primary strategy.

Method 4: Third-party price tracking apps

How it works: Apps like Hopper, AirHint, and others let you track specific routes and send push notifications when fares change. Some are designed specifically for post-booking monitoring. For a detailed comparison of these tools, see our flight price tracking apps comparison.

Pros: More focused on price drops than Google Flights. Some let you input your purchase price so alerts are personalized.

Cons: Most require you to manually enter flight details (route, date, airline, fare class). Many are ad-supported or push you toward booking through their platform. Price data can lag behind what's actually available on the airline's site. And they typically only track cash fares — if you booked an award flight with miles, you're out of luck.

Best for: Travelers who don't mind installing another app and manually entering their trip details.

Method 5: Email-based tracking

How it works: You forward your booking confirmation email to a tracking service, which automatically extracts the flight details and purchase price. The service monitors the fare and alerts you only when the price drops below what you paid. Slipfare works this way — forward your confirmation to track@slipfare.com and monitoring starts automatically.

Pros: No manual data entry — the flight details and your purchase price are parsed from the confirmation email. Alerts are personalized to your actual fare, so you only hear about it when there's a real savings opportunity. Works for both cash fares and award flights booked with miles. No app to install.

Cons: Requires forwarding an email for each flight you want to track. If you rebook at a lower price, you need to forward the new confirmation to update your tracked fare.

Best for: Anyone who wants a hands-off approach to post-booking price monitoring without manually entering flight data.

Which method should you use?

It depends on how much effort you want to put in and how many flights you track per year. Here's a quick decision framework:

• One or two flights a year: Manual checking or Google Flights alerts are probably fine. Set a calendar reminder to check every few days.
• Frequent travelers: Manual checking doesn't scale. You want something automated that knows what you paid and only alerts you when there's an actionable drop.
• Award flight bookers: Most tools don't track miles-based pricing. You need a service that specifically supports award fare monitoring.

The best approach for most travelers is to combine a quick, low-effort tracking method with the knowledge of how to rebook when a drop happens. The monitoring is only half the equation — knowing the rebooking process for your airline ensures you can act quickly when the alert arrives.

The bottom line

Tracking flight prices after booking is one of the easiest ways to save money on travel, yet most people never do it. The gap between "knowing prices fluctuate" and "actually catching a drop" is entirely a tooling problem. Pick the method that fits your travel style, set it up once, and let it run in the background. The savings add up faster than you'd expect.