As far as airfare, traveling on Tuesdays, Wednesdays, and Saturdays are the cheapest usually. Traveling on the holiday itself is usually less expensive. If the airlines are going to reduce their fares, it's usually in the "wee" hours of Wednesday mornings. They usually pull those fares later on Wednesday or Thursday. The airlines raise fares by Fridays, because most people book their travel plans on the weekends. However, I've noticed that the airlines are not reducing their fares much in the last year.
Now, there are ways to save on accommodations as well. Disney has 5 different seasons: Value, Regular, Summer, Peak, and Holiday. Disney also has different categories of resort hotels: Value, Moderate, Deluxe, and Deluxe Villas.They even have a camp ground and cabins!
Note: Disney has changed their seasons: Value 1, Value 2, Fall Season, Regular Season, Summer Season, Peak Season, and Holiday Season.
As of late, Disney has been coming out with some really good discounts and other deals if you book one of their Magic Your Way Packages. One of which is free dining. Not having to worry about the cost of food on your trip will save you a lot of money, especially considering the cost of food.
Transportation is another "biggy." Disney has free transportation to and from the airport and also within Walt Disney World, so you may not need to rent a car. However, if you really want to rent a car there are some things to know that will help you save money.
Check with your auto insurance, they may cover your car rental. I've been talked into some pretty expensive insurance by car rental companies. One trip, I remember spending over $500 just on the car rental!
There are discount codes for car rentals. Usually I find 20%-30% off of the price of the car. The best deal I got was 40% off by my Borders Rewards Card! I paid $79 for 4 days!
One place that I've found these codes is www.mousesavers.com. These codes are not just for car rentals around Walt Disney World or Disneyland.
Flexibility on your travel dates is key when you want to save money on travel!