The Seattle Sounders announced on Tuesday that if Toronto FC beats Montreal Impact in the Eastern Conference finals and hosts Seattle for the MLS Cup final, the away-ticket allocation will be open to Sounders season-ticket holders through a lottery system. An exact number of available tickets was not released, but it will be extremely limited. Season-ticket holders must apply through a form on the club website. Members are not automatically entered for this lottery.
Here are the lottery guidelines, per the club announcement:
One entry per account.
If selected as a winner, you are eligible to purchase the same number of tickets associated with the selected season ticket member account for the 2016 season.