singapore airlines? the trains in spain?

Sing Air doesn't look like a good option for cycle unless you can fit your bike in the luggage allowance (30k + 7)? It is US$55 per kg over that! Swiss Air have a flat fee 100 Euro for intercontinental flight. They do charge per segment so might try an additional fee for Geneva/Spain leg.
I rode from Barcelona north and there was plenty of options to avoid highways. I assume it will be the same.
Had a quick look for you: http://howilearnedtostopworrying.com/2013/03/30/the-coast-road-to-barcelona/

Have you figured out your weight requirements? I'd say its easy to bring a bike within the 30 kg limit. Mine usually weighs:
Bike 12.5 kg,
cardboard bikebox 2.5 kg ,
2 panniers incl. tent, tools, spares 12-14 kgl.
That's less than 30 kg and you still have your 7 kg onboard allowance!

Well, the problem is that I'm transporting my bike and bike touring stuff to Spain and I'm going to store it there and then head to Scotland for a while and want to pack a lot of warm woollies since I'll be there for the winter. So I've got two things going on. I can certainly pack for a bike tour at under 30kgs but I'm not sure if I can pack for a bike tour and a Scottish winter under 30kgs. I should have learnt by now to keep my life simple. But I haven't.

I guess I just need to get everything together and weight it but I need to book kind of now. Once I book then maybe simplicity will be enforced by the limitations that entails.

Pack your 37 kg and buy a pair of wellies and a sweater in Scotland ;-)

Weigh your stuff? Don't you have all your equipment in an excel sheet? I pack on the computer and when the correct weight is attained I print a list for the final physical packing ;-)

Hmmm. No. I don't have all my stuff on an excel sheet. I probably should. But I think excel sheets might be a male thing.

I was of course teasing you a bit, although I do actually have my stuff in a spreadsheet. Its really useful. I can pull out an older sheet and see what I packed last time or send it to a friend. You can plan in advance, every time you think of stuff to bring, you can add it, there and then. If you have a tendency to pack to much, you can pack until the weight is suitable, without having to unpack a lot of times. AND you can pack, while at work ;-) and just toss everything in your bags according to the list, when you come home. If I go trekking and biking in f.ex. Nepal, I have a trekking list and a biking list, which I bring with me, to do the repacking on site for the next adventure.
Is it a male thing to plan? ;-) ;-) hmm but it is nerdy, I know.......

Have you thought of posting (mailing) some of your stuff to Spain or Scotland? Postal rates are much cheaper than excess baggage.

Re the bikes on the train in Spain thing and the coastal cycling thing, you could try posting on the UK's CTC site. Loads of British cyclists go to Spain and some also use the trains. http://forum.ctc.org.uk/viewforum.php?f=16

I usually fly Emirates, but I haven't heard anything bad about Singapore from cyclists and non cyclists. Most say they are good. You are most likely to have problems with Aussie check in staff. I presume you are boxing your bike.

.............You are most likely to have problems with Aussie check in staff. I presume you are boxing your bike.

I don't think you'll have any trouble if you buy a Qantas bikebox in the airport and use that. Checkin people are used to those.