When is SEA LIFE Manchester open? Opening times at SEA LIFE Manchester can vary throughout out the year. For our opening times please click here. Related articles My voucher says I can use it online - where do I enter my code? Can I use a 2 for 1 voucher in conjunction with a combination ticket or a Parent & Toddler? How long do I have to use my combination ticket? When are quieter times to visit SEA LIFE Manchester? Are there any restrictions for children at SEA LIFE Manchester?