On Friday afternoon, the Tongan government had said it would take up to 18 hours to splice the cable before services would resume.
"The work to splice the cable on Tonga's side started at 7am this morning. After the splice, several tests will be conducted, which will take up to 10 hours," Edwin Liava'a, CEO of Tonga Cable, said at the time.
"By midday tomorrow, the international submarine cable should be back online if there will be no major complications."
By Saturday evening, it was expected that Tonga's telcos would be back using the cable connection.
While the cable was down, satellite providers rushed to fill the gap. Mobile network provider Digicel used SES networks, and local ISP Ezinet used a Kacific Ku-band satellite, while New Zealand telco Spark helped get Tonga Communications back online using Intelsat satellites.
Spark said it had restored 100Mbps of connectivity within five days of the outage, which is approximately a quarter of the nation's usual usage.
The 827km cable between Tonga and Fiji that connects to the Southern Cross Cable went live in August 2013, and was funded jointly by the Asian Development Bank and the World Bank. It was later extended out to the Ha'apai and Vava'u islands in April last year.
RadioNZ reported that the connection to the northern islands was expected to take another couple of days, as it too has been cut.
It was also reported that Tonga Cable is looking into a second cable connection to the Pacific nation.
The Asia-Pacific Gateway (APG) subsea cable connecting China, Hong Kong, Japan, South Korea, Malaysia, Taiwan, Thailand, Vietnam, and Singapore, owned by a consortium including China Telecom, China Unicom, China Mobile, NTT Communications, KT Corporation, LG Uplus, StarHub, Chunghwa Telecom, CAT, Global Transit Communications, Viettel, and VNPT, and being constructed by NEC
The Southeast Asia Japan 2 cable (SJC2), which will have 11 landing stations in Singapore, Thailand, Cambodia, Vietnam, Hong Kong, China, South Korea, Taiwan, and Japan, being built by NEC and funded by a consortium including China Mobile International, Chunghwa Telecom, Chuan Wei, Facebook, KDDI, Singtel, SK Broadband, and VNPT
The Bay to Bay Express Cable System (BtoBE), connecting Singapore and Hong Kong with the US, being funded by consortium including Facebook, Amazon Web Services (AWS), and China Mobile International, and being built by NEC