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Hey there, you’re reading an outdated post! The updated series from April 2015 can be found here.

This is the twenty-eighth post in a monthlong series. Each post will take about two minutes to read and may include an action item that takes the reader another two minutes to complete. I am writing this for an audience of people who know nothing about frequent flier miles, and my goal is that by the end, you know enough to fly for free anywhere you want to go.

The Great Circle Mapper is a valuable, free, online resource that can be found at It is a simple mapping tool that can shed light on your itineraries.

On any page, you can type airport codes into the text box. If you separate two codes with a dash, a straight line will be drawn between them and the distance of the flight given.

A comma can be used to separate airport codes between which you will not be flying.

This denotes an open jaw trip. The outbound is Los Angeles to Honolulu. The return is Kahului to Los Angeles.

After typing in the codes separated by the appropriate dashes and commas, click Map.

Now you have a cool map of your upcoming trip with the distance of each segment and the total distance listed below. Beyond its coolness, I use Great Circle Mapper for several reasons.

If you want to know how the distance of an itinerary changes by adding stopovers or changing the routing, it’s a a great tool.

This is important if you are trying to earn miles from flying paid tickets, and you want to see how many miles each routing earns. Most airlines’ official distance between two airports corresponds almost exactly to Great Circle Mapper’s distance.

Another reason you want to know the distance is to know how many Avios would be needed for an award flight between two cities. Because Avios is a distance-based award program, you need to know the distance of each segment to know how Avios will price an award.

The third reason to use Great Circle Mapper is to check whether a putative award routing is legal. Many award programs have a maximum mileage that can be flown between any given award origin and destination. (It is usually a multiple of that city pair’s Maximum Permitted Mileage. For instance a United award’s routing is capped at 1.15 * MPM.)

And my favorite reason to use the Great Circle Mapper is to visualize all the free first class I’m flying. Here’s my flights flown or booked for 2012 and 2013, and hopefully I’ll be adding more soon because I see big holes is Asia!



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