The Kiwis, who beat India by eight wickets in the World Test Championship final this week, will go straight into a 14-day quarantine on arrival home via Singapore.
Southee believes that the crucial wickets of India captain Virat Kohli and Cheteshwar Pujara on the final day had set up his side's triumph.
It is the first major ICC trophy for New Zealand, who had reached back-to-back ODI World Cup final in 2015 and 2019, since 2000.
Crowned the world Test champions after a two-year grind, the New Zealand players let their hair down as they celebrated the emphatic eight-wicket win over India.
Rain and bad light played spoilsport for the most part of the WTC final but there were no "lucky" deflections off the bat or "scrappy" boundary count rule to ruin New Zealand's party.
New Zealand defeated India by eight wickets to be crowned the first-ever world Test champions in Southampton on Wednesday night, their first ever ICC title.
The bowlers, inspired by a daunting Mohammed Shami and crafty Ravichandran Ashwin, did put New Zealand under pressure, but the batting frailties, as admitted by skipper Virat Kohli, cost India the WTC title.
The right-handed batsman had earlier said he would have retired had New Zealand lifted the 50-over World Cup in 2019. They lost to England in the final.
A lot of that commitment was on display against the world number one Indian team with the Kiwis bowlers out-witting star-studded lineup before Williamson and Ross Taylor combined to take the team home in a chase of 139.
For the second time in the one-off clash, a whole day has been lost after no play was possible also on the opening day.
Taking out Ishant Sharma and Jasprit Bumrah in successive deliveries after lunch helped him bag his five-wicket haul, only his fifth in an eight-Test career
HIGHLIGHTS, India vs New Zealand WTC Final, Day 3: Follow Live Updates and commentary of Day 3 of World Test Championship final in Southampton.
New Zealand captain Kane Williamson won the toss on Saturday and opted to bowl against India in the final of the inaugural World Test Championship at the Rose Bowl Stadium in Southampton. India kept their playing XI unchanged despite change in conditions at the venue owing to incessant rain on Day 1.
India kept their playing XI unchanged despite change in conditions at the venue owing to incessant rain on Day 1.
Live Cricket Score, India vs New Zealand WTC Final, Day 2: Follow Live Updates and commentary of Day 2 of World Test Championship final in Southampton
Southampton weather update today: The forecast shows that a large part of the day will remain 'partly sunny' with a light shower in the afternoon
Live Streaming India vs New Zealand World Test Championship Final Day 2: How to watch Live Day 2 of the WTC Final IND vs NZ Online on Hotstar Live Cricket TV
Live Cricket Score, India vs New Zealand WTC Final, Day 1: Follow Live Updates and commentary of Day 1 of World Test Championship final in Southampton
Following their 1-0 series win in England against Joe Root's men last week at the Edgbaston, New Zealand leapfrogged India to take the top spot in the ICC Test ranking.
Live Streaming India vs New Zealand, World Test Championship Final: How to watch Live WTC Final IND vs NZ Online on Hotstar Live Cricket TV
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