We all experience loneliness at some time in our lives, but there are many promises in the Bible that can help us through those lonely times.

Once we have Jesus in our hearts, we always have His company and love.
John 14:18
Matthew 28:20b
Romans 8:38-39
Hebrews 13:5

Though earthly companionships may fail, the Lord never fails.
Psalm 38:11,15
Psalm 142:4-5
Isaiah 49:15-16
2 Timothy 4:16-17a

Sometimes the Lord lets us feel lonely to drive us closer to Him.
Psalm 63:1,5-7
Psalm 73:25-26, 28
Philippians 3:8
Colossians 2:10

Even Jesus felt lonely and forsaken at times.
Isaiah 53:3-4,6
Matthew 27:46
John 1:10-11
Hebrews 4:15

Reaching out to others and being a friend is an antidote to loneliness.
Proverbs 11:25
Proverbs 18:24a
1 Thessalonians 3:12a