While the Bharatiya Janata Party said the plan to fly the flag in Srinagar to mark India's Republic Day on Wednesday, was a patriotic right, the government dismissed it as a political stunt ahead of state elections this year.
"We have landed in Jammu. It appears they have locked the terminal gates. Not being allowed to go out," Sushma Swaraj, the leader of the BJP in parliament said in a tweet from the airport in Jammu.
"Just see, we are being deported because we want to fly the national flag," she said, as hundreds of party supporters blocked roads outside the airport to protest against the administration's decision not to allow her to travel onwards to Srinagar.
Officials in IHK fear that the BJP's plan to hoist the Indian flag as a symbolic show of control over the region could reignite protests in which more than 100 people were killed last year.
Separatists had vowed to oppose the BJP's move to hoist the flag in the heart of Srinagar.
The BJP leaders planned to go to Srinagar on road along with activists who have been travelling with the flag across the country.
"We have requested them to return to Delhi but they don't agree," a security official said.
The Jammu and Kashmir Liberation Front said it would unfurl its own flag in the city centre in Srinagar and demand independence.
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