Scanmom, where are you coming from?
I have heard that Burbank is really a nightmare and a hassle, traffic-wise. Most vets on this board advise against Burbank.
Ontario is about 30 miles away, about the same or farther than LAX, and apparently kind of a bummer also as far as transportation hassles.
Have you tried Long Beach? It's often the cheapest, and it's the next closest to SNA.
Here's my little airport blurb from my own information notes:
Airfare and airports
Start checking your airfare as far in advance as possible. There are four possible airports to fly into, and they all have pros and cons.
LAX, approx. 35 miles away: pros, often the cheapest and has the most flights and times available, Disney Resort Express bus runs on a frequent and convenient schedule. Cons, can be expensive for ground transportation because its the farthest away; its your typical huge, dirty, loud international airport.
ONT, Ontario: approx. 30 miles away: pros, often fairly cheap to fly into, not as big. Cons, ground transportation can be pretty expensive since its quite a distance
SNA (also known as Orange County or John Wayne airport) approx 12 miles away: pros, the closest airport, small, yet very nice and convenient.
Disneyland Express also runs here, and shuttles run just $8-10 per person. Cons: its usually the MOST expensive of all the airports. Dont know why, but it costs us over $100 or more extra, per person, to fly into SNA.
LGB, Long Beach, approx 14 miles way: the choice of many. It is a small, clean, quaint airport (you deplane down stairs onto the tarmac!) and nearly as close as SNA; yet it can cost considerably less to fly into. Cons: Not as many flight time choices; ground transportation can cost more here; Super shuttle is 3x as much for some reason, although a taxi will cost you the same as from SNA ($40 flat fee one way). Disneyland Express doesnt operate from here.
Hope that helps!