The 36-year-old Czech national was arrested on Saturday after the body of Rebecca Johnson, 26, was found in the Finnish village of Kuttanen.
Ms Johnson was a member of the Santa Safari team which works with tour operator Transun Travel to organise Christmas-themed excursions to Lapland.
The couple lived in Scotland before moving to the Arctic for seasonal work.
Ms Johnson was from Burntisland in Fife.
A Finnish police statement said: "Lapland District Court has today imprisoned the suspect of the homicide, according to the claim of the Lapland Police Department.
"A 36-year-old Czech citizen is suspected of killing his 26-year-old long-term partner. The victim is a female citizen of Scotland. The crime is investigated as a murder."
It is understood members of Ms Johnson's family have since travelled to Lapland.
The police statement said: "The suspect has been co-operative but hasn't been able to clarify a specific motive for his suspected act.
"Police will continue the investigations by hearing the witnesses and the suspect, and by conducting technical investigations."
The suspect was arrested on Saturday after fleeing into the Lapland wilderness on a dog sled.
The police operation involved a helicopter and officers on snow scooters in temperatures of -30C.
The man was said to have been suffering from hypothermia when he was found.

It will give 40 million yen (Â£274, 000) to the Cartivator group that operates outside Toyota city in central Japan.
The Nikkei Asian Review reports Toyota and its group companies have agreed in principle to support the project.
So far crowdfunding has paid for development of the so-called Skydrive car, which uses drone technology and has three wheels and four rotors.
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Measuring 9.5ft (2.9m) by 4.3ft (1.3m), Skydrive claims to be the world's smallest flying car.
It has a projected top flight speed of 100km/h (62mph), while travelling up to 10m above the ground.
The team of 30 volunteers developing the Skydrive car hopes its prototype could be used to light the Olympic flame when Tokyo hosts the summer games in 2020.
Flying cars are something of a flavour-of-the-month at present, with firms from the US, Germany, Netherlands, China and Japan looking to turn science fiction into reality.

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26 September 2014 Last updated at 10:49 BST
The strikes were expected as part of President Barack Obama's pledge to "destroy" IS, which has taken over large parts of Iraq and Syria.
IS is a radical militant group which has threatened to harm any non-muslims unless they convert to Islam.
They want to make a new country called the Islamic State.  It would join parts of Iraq and Syria together.
Obama has promised to try to stop the group and the US has already launched air strikes in Iraq since August.
But this is the first time the group has been targeted in Syria and is supported by some other Middle Eastern countries such as Jordan and Saudi Arabia.
Pentagon spokesman Rear Admiral John Kirby, said fighter and bomber jets and Tomahawk missiles were used in the attack.
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The 28-year-old left Rovers after their National League promotion final defeat by Grimsby earlier this month.
He made 33 league appearances this season, scoring six goals from defence, and has previously played for the likes of Cambridge and Mansfield.
"I spoke to Gary last week and was delighted to join a great club, moving in the right direction," he said.
"There was interest elsewhere but when I had a good couple of hour chat with Gary last week and was happy with his vision."
A man has been remanded after appearing in court in Lapland accused of murdering his Scottish girlfriend.
[NEXT_CONCEPT]
Japanese carmaker Toyota has announced its backing for a group of engineers who are developing a flying car.
[NEXT_CONCEPT]
The US and its supporters including several Arab countries have launched the first air strikes against Islamic State (IS) in Syria, the Pentagon says.
[NEXT_CONCEPT]
Left-back James Jennings has joined promoted Cheltenham Town from Gloucestershire rivals Forest Green.