Mcormack, are you serious?!
Why bother comment on something you obviously know nothing about.

Error fares are just that - an input error that is usually an airfare missing the high taxes or something. When an error fare occurs, which is surprisingly often, they last a very short amount of time before they are usually noticed by the airlines and corrected. If you are lucky enough to be quick and catch one, then you'd be flying to Tokyo for £155 return.
Sadly, soon after they get posted on sites like these, they are amended.

The fact that the OP decided to share it with you is a very generous thing to do, to call them a clown just goes to show how hugely naive you are.

Cheers OP for the heads up, someones going to Japan for an absolute steal! As for you mcormack, Im kinda glad you're not as it'd be insufferable sitting next to you on a flight.

"Istanbul (Not Constantinople)"

Istanbul was Constantinople
Now it's Istanbul, not Constantinople
Been a long time gone, Constantinople
Now it's Turkish delight on a moonlit night

Every gal in Constantinople
Lives in Istanbul, not Constantinople
So if you've a date in Constantinople
She'll be waiting in Istanbul

Even old New York was once New Amsterdam
Why they changed it I can't say
People just liked it better that way

So take me back to Constantinople
No, you can't go back to Constantinople
Been a long time gone, Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks

Istanbul (Istanbul)
Istanbul (Istanbul)

Even old New York was once New Amsterdam
Why they changed it I can't say
People just liked it better that way

Istanbul was Constantinople
Now it's Istanbul, not Constantinople
Been a long time gone, Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks

So take me back to Constantinople
No, you can't go back to Constantinople
Been a long time gone, Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks

Never heard of an error fare before but was an amazing deal IF it works.

do you have to transfer in Helsinki Finland at all since its finnair?

Searched and found nothing like this price..smells like a bs post.

OP I just looked up your deal in details... it is a Polish airline called LOT, not finnair

I checked as well and the prices start above £400, must have gone already

CLOWN

Have done several of these error fares in the past. They're a great way to rack up airmiles for very cheap, did Milan-Rome-Paris-Singapore-Paris for £120 a few years back. Alas, until the flight is ticketed nothing is guaranteed, and often the airlines don't honor the fare (although sometimes they do, notably, BA's recent error fare to the US).

"Istanbul (Not Constantinople)"

Istanbul was Constantinople
Now it's Istanbul, not Constantinople
Been a long time gone, Constantinople
Now it's Turkish delight on a moonlit night

Every gal in Constantinople
Lives in Istanbul, not Constantinople
So if you've a date in Constantinople
She'll be waiting in Istanbul

Even old New York was once New Amsterdam
Why they changed it I can't say
People just liked it better that way

So take me back to Constantinople
No, you can't go back to Constantinople
Been a long time gone, Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks

Istanbul (Istanbul)
Istanbul (Istanbul)

Even old New York was once New Amsterdam
Why they changed it I can't say
People just liked it better that way

Istanbul was Constantinople
Now it's Istanbul, not Constantinople
Been a long time gone, Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks

So take me back to Constantinople
No, you can't go back to Constantinople
Been a long time gone, Constantinople
Why did Constantinople get the works?
That's nobody's business but the Turks