Is it possible to check-in for a flight at a connecting airport

Is it possible to check-in for a flight at a connecting airport?
I have a flight booked to return from Europe in July and as it is currently scheduled I would be departing from Stavanger Norway, to Copenhagen, to Washington DC, to Cleveland Ohio. However due to a change of plans i will be very near Copenhagen on the date of my return flight. It would be quite a hassle to go all the way back to Norway just so i could fly back to Copenhagen, so would it be possible for me to just check in for my flight at Copenhagen and continue as planned from there? Anyone ever tried this before? The reason i ask is that the flight was booked through expedia, and they are telling me that no changes to my itinerary are possible... However the airline (SAS) says that changes are possible with a $300 fee, but since it was booked through expedia, they are the ones who would have to make the change. Paying an extra $300 just to have one less flight seems ridiculous. And dealing with expedia & the airline so far seems to be one giant hassle. I dont care about a refund on that leg of the journey, I just want to fly home from Copenhagen instead of Norway. Has anyone dealt with a similar situation before?
Air Travel - 6 Answers
Random Answers, Critics, Comments, Opinions :
1 :
If you don't change your ticket and don't show up for your first flight the entire return flight will likely be voided and you would be stuck. This is actually in the contract of carriage you agree to when you fly on an airline.
2 :
check in online or over the phone.
3 :
Jason's answer is correct -- as soon as you fail to check in at your origin, all remaining flights will be cancelled. The only way you'll be able to fly from CPH is to pay the costs that SAS is requiring and change your ticket with Expedia.
4 :
If you are holding only one single ticket from Norway to Cleveland, and now want to start flying from Copenhagen instead, it means you've changed your itinerary and there is going to be a fee to change your ticket accordingly. In case you don't show up in Stavanger for the flight without any notice, your entire ticket would be canceled a few minutes after takeoff and you would not be able to fly anywhere with it.
5 :
Every airline charges a significant fee for changing the itinerary. If you fail to check in at your origin airport, your entire trip will be void and you will be stuck in Europe. Your best option is to cancel your flight and book a completely new one. However, that will not come without some expense. If you don't want to pay the extra money, the only thing you can do is fly out of Norway.
6 :
SAS airlines uses Sabre as their reservation system. What that means for you is that you cannot just show up in Copenhagen and continue on to IAD. I am assuming that all four segments are under the same e-ticket. So, if that is the case, the second that flight from Norway takes off and you weren't checked in, the entire itinerary will be deleted and you will forfeit your fare. So, unless SAS cancels your Norway - Copenhagen segment without charging you a change fee, then you will have to make the journey back to Norway to come home.