Delaware (30-1) hadn't been seeded higher than 12th in the program's previous two tournament appearances. The seventh-ranked Blue Hens will play 14th-seeded Arkansas-Little Rock Sunday in the Des Moines region in Little Rock, Ark.
Players and coaches watched the selection show Monday night on the Delaware campus with a crowd of more than 500 season ticket holders and students watching.
Led by Elena Delle Donne, Delaware set school records this season for most wins (30), longest winning streak (20 straight games) and first ranking in The Associated Press Top 25.
The Hens' only loss was 85-76 at Maryland Dec. 29.