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Oneworld member Finnair has an excellent sale in Business class from Oslo to Singapore for only £1065, via Helsinki.
If you prefer Qatar Airways, they have launched as well a sale. Prices start at £1230 and Doha to Singapore is operated by Qsuites.
Available from April to June and in November until beginning of December.. You must travel on a Tuesday, Wednesday or Thursday.
How To Book These Flight Deals
The cheapest fares can be found via Momondo, where you can find as well the airlines to book directly with them.