You could fly into Belfast and work your way down. It's called and open jaw ticket.

Try these guys, they've been recommended in Fodor's.

www.rabbies.com

For hotels, try these folks. http://www.venere.com/ireland/killarney/

First. Get the bus direct from Dublin Airport to Belfast, no point in getting a bus into Dublin and then a train. Return tickets available.

http://www.translink.co.uk/Goldline/Goldline-Timetables/
http://www.aircoach.ie/

I use the Eviston Hotel in the centre of Killarney, upgraded room for comfort without the stupid prices charged by some Killarney Hotels. Or Sunnybank B&B

http://www.evistonhousehotelkillarney.com/home.html
http://stayatsunnybank.com/

Sunny49; I strongly suggest you stay at Earl's Court in Killarney. We stayed at Earl's Court in September of 09' and again in October of 2010 and enjoyed both stays. I have posted reviews on Tripadvisor if you want to read that. We had a great room, enjoyed having computer access in their lounge along with the sweet breads and coffee always available there. The breakfast selection and buffet are very tasty ESPECIALLY the sweet bread on the buffet. Earl's Court is only about a 3-5 minute drive to downtown Killarney but not on a very busy street so you don't get a lot of tour buses constantly driving by. I know that you would not be disappointed if you stay there. b.

Earl's Court in Killarney starts at €170/room B&B
Gleneagle starts around €150/room B&B

A super top B&B would be about €100/room B&B

A superior or Deluxe room at the Eviston €70 or €80/room B&B
Sunnybank from €70
Fairview Executive room with Jacuzzi this week €89/room B&B

The above all based on 2 sharing.

Hence my comment regarding stupid prices

I just started looking for a hotel/BnB for 3 nights in Nov.. The parking tight at Eviston sounds a little tight.
I might like the the location of Sunnybank.

We have stayed at Carriglea House www.carrigleahouse.com several times. It's a comfortable, very quiet B&B, directly across from Killarney National Park and is driveable to Dingle. I would recommend at least 2 nights in Killarney.

Tony; Price must have really gone up in the past 1 1/2 since we stayed at Earl's Court; our cost was 55 euros PPS for their balcony room which cost more. I still recommend Earl's Court to everyone since we had such a great experience there twice!

We are still working on hotels/B&B's for our late Sept/Oct trip. One way to get better rates is to take advantage of a booking group such as booking.com, etc. We got a nice **** inn in Clifden for significantly less than their website price. A hotel in Cashel may be on our travel plan when we found it on a booking site quoted in USD for well under $200. We have not been to Ireland in ten years and it is looking expensive compared to what we spent on lodging in Scotland recently. We hope to spend two nights in Killarney.

nini, Where in Clifden? We always try and get into Dún Rí when possible.

Just a note: Most of these responses were posted after the OP's trip was finished. They left Ireland on July 1.

Duh! Must learn to read!