Originally Posted by donotblink

You’re asking a great question, and it sounds like you’re doing a lot of the right things already. To answer your question about dynamic pricing and why fares may not move much until closer to departure, it helps to understand a bit about how airline revenue management works.



Airline Inventory and Revenue Management 101



Airlines use sophisticated systems to manage both fare filing and inventory control. These are two different but connected concepts:



1. Fare Filing (Pricing Rules)



This is the published part of the system. Airlines file fares with pricing rules via systems like ATPCO. These rules include:

• Base fare price

• Advance purchase requirements (e.g., 21-day advance)

• Minimum/maximum stay

• Change and refund penalties

• Fare class (e.g., “W”, “Y”, “J”, etc.)



Once these fares are filed, they’re visible to booking systems (Google Flights, Expedia, airline websites, etc.). Just because a fare is filed doesn’t mean it’s always available for purchase—this is where inventory comes in.



2. Inventory (Seat Availability by Fare Class)



This is the availability side of things. Airlines assign a limited number of seats to each fare class. For example:

• There might be 10 seats in the “W” class (a lower-priced premium economy fare)

• 5 in “P” (a higher-priced premium economy)

• And 7 in “J” (full fare business class)



The number of seats made available in each class fluctuates based on the airline’s forecast of demand. This is where revenue management steps in—airlines want to maximize the total revenue on a flight, not just sell the cheapest seats. So they manage how many seats are available at each price point depending on:

• Current bookings

• Historical data

• Seasonality

• Demand predictions

• Competitive pricing



That’s why fares don’t always drop—or rise—in a linear way. Often, you’ll see prices stay fairly flat until the airline gets better visibility into demand (often around 60–30 days out), and then they either:

• Open cheaper fare buckets to stimulate demand (if bookings are weak)

• Close cheap fare buckets and push only expensive options (if demand is strong or they expect last-minute business travelers)



Why You May Not See Much Fluctuation



A few reasons might apply in your case:

• Premium Economy fares are less volatile than economy fares. Airlines file fewer price buckets in this cabin, so there’s less room for fluctuation.

• You’re searching without specifying carriers — Google Flights alerts can’t track fare class availability, only total price. If a lower fare is available but sold out in inventory, you won’t see it.

• You’re watching filed fares, not inventory changes — Just because a lower fare exists doesn’t mean the airline is offering seats at that price for your date.

• You’re traveling on popular dates/routes — On high-demand routes (or if the airline sees steady bookings), fares may never drop.

• Incognito mode doesn’t affect pricing — That’s mostly myth. Airlines don’t change fares based on your browsing history—prices change due to revenue management, not cookies.



Tips to Optimize Your Search

• Search by fare class when possible. Use tools like ExpertFlyer or ITA Matrix to see inventory levels by class (e.g., “W5” means 5 seats in W class are available).

• Set Google Flights alerts for specific carriers, not just “any airline.” That can give you more accurate insights.

• Consider booking when you find a fare that’s aligned with historical norms for your route—trying to “game” the system too much often leads to paying more.

• Use tools like Google Flights, Hopper, or Kayak Price Trends to spot good timing based on historical pricing patterns.