Orbitz is powered by ITA so as a general principle you can usually buy ITA found fares from them, even originating outside the US. Ebookers is also owned by them but isn't always as reliable at coming up with fares, possibly due to local country specific sites clashing with fare rules (this also works in reverse though, eg last year's IB ex France fares were only on ebookers.fr and Expedia.fr)

I checked Orbitz for your dates and the fare comes up, along with a cheaper Finnair one. Didn't try ebookers.