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I booked a cheap(ish) flight from San Seb on Sat morning. It goes via Madrid on http://www.airnostrum.es and then a BA flight from Madrid to London. The only issue I can see is that Air Nostrum will probably want to charge me an extra 45EU for the bike box but I will need to contact Iberia, who seem to own/manage them, to find out.
Oh, I'll need to find a bike box too (or potentially buy one at the airport).
@CarlosBI do you know any bike shops in San Seb that might hang onto some boxes for riders, nearer to the race?
The buses are limited to 3 bikes not limit room for them If you have it in a cardboard box or a plastic bag it's enough (but normally they charge for 10€ for the bike).
If not you have the train, it's free for the bike and has cheaper tickets (4€ instead of 10-15€) but takes 2h45min.
The buses takes around 1h 1h15min