Upvote:2
There are many reasons for this:
If you are so lucky - you should always pick a satellite airport to start and end your journey. The cost will most likely always be in your favor.
Upvote:9
Airlines will charge what they think customers will pay, and that price fluctuates over time and for various commercial factors, including demand, cost of supply and other factors.
I often travel to the 3rd nearest airport (2 hours drive away) to save sometimes upwards of Β£1000 when taking the family on holiday.
Always looking at nearby airports - both for your start and destination.