flights

It should be noted that the days surrounding the 4th of july holiday are some of the most crowded days at Disney.  More crowded means more time in line and less rides ridden by the end of each day.

I have always found Southwest airlines to be the least expensive for getting to Central Florida.  Southwest flights BWI to Tampa tend to be less expensive than bwi to orlando.  Tamp is a 1 hour 12 minute drive to Magic Kingdom instead of a 25 min drive from Orlando.  Casey and I have flown into Tampa for a Disney vacation often.  Would require a rental car, cannot use Disney Magical Express Airport Shuttle.

southwest round trip flights bwi-orlando. Are more expensive than bwi-tampa.   It is best to book Southwest 6 weeks in advance, but not more than that as prices fluctuate daily.

Airlines other than Southwest charge around $30 for seat assignment, $50/checked bag, $16 per carry on bag, $5 if you don't print your own boarding pass, and they charge for in-flight non-alcoholic drinks.

American Airlines has some decent prices ($783 for 3 people round trip) if you fly tuesday to tuesday or wed/wed:

Delta also has decent prices for tues-tues flights: