Found a Travelocity rate ORD-DUB for approx USD 340.00 inc tax for travel in March and April on either airline. Fare basis KLXUSSL and is a Mon-Thurs fare with min stay Sat nite and 30 day max. Seasons are 28Feb-10April and ticket is nonrefundable with changes to inbound at approx 150.00. (when I say approx, it's because converting to USD from CAD)

Sample itin. I priced looked like this:

Flight: Scandinavian Airlines flight 946 on a Boeing 767 Jet
Depart: Chicago-OHare (ORD)- Thu, 03 Apr 15:15
Arrive: Arlanda-Stockholm, Sweden (ARN) - Fri, 04 Apr 07:35

Flight: Scandinavian Airlines flight 3115 operated by Skyways AB on a Embraer ERJ-145 Jet
Depart: Arlanda-Stockholm, Sweden (ARN)- Fri, 04 Apr 15:30
Arrive: Dublin, Ireland (DUB) - Fri, 04 Apr 17:10

Flight: Scandinavian Airlines flight 3116 operated by Skyways AB on a Embraer ERJ-145 Jet
Depart: Dublin, Ireland (DUB)- Mon, 07 Apr 18:40
Arrive: Arlanda-Stockholm, Sweden (ARN) - Mon, 07 Apr 22:20

Flight: Scandinavian Airlines flight 945 on a Boeing 767 Jet
Depart: Arlanda-Stockholm, Sweden (ARN)- Tue, 08 Apr 10:35
Arrive: Chicago-OHare (ORD) - Tue, 08 Apr 12:40