To wish someone on Onam, use warm and joyful messages that reflect the spirit of the festival, such as:

• "May this Onam bring joy and prosperity to your home!"
• "Wishing you a bountiful harvest of happiness and good fortune."
• "May the beautiful flowers of Onam fill your life with colors of joy and love."
• "Wishing you a grand Onam celebration filled with delightful moments and cherished memories."
• "May King Mahabali bless you with prosperity and happiness."

These wishes can be shared in person, in cards, messages, or on social media to convey happiness, unity, and blessings during the festival. Common themes include prosperity, joy, peace, togetherness, and respect for King Mahabali, whose homecoming is celebrated during Onam.