Chronological Order for Aincrad courtesy of an /a/non

Volume 1 - Chapters 2 and 3
Volume 8 - "First Day"
Sidestory - "Aria in the Starless Night"
Volume 1 - Beginning of Chapter 4
Volume 2 - "Red-nosed Reindeer"
Volume 2 - "Black Swordsman"
Volume 8 - "A Murder Case in the Area"
Volume 2 - "Warmth of the Heart" parts 1-3
Sidestory - "Sound of Water, Sound of Hammer"
Volumes 1, 2 - Prologue
Volume 1 - Chapter 1
Volume 1 - End of Chapter 4
Volume 1 - Chapters 5-16
Volume 2 - "Morning Dew Girl"
Sidestory - "Algade Showdown"
Volume 1 - Chapters 17-23
Volume 2 - "Warmth of the Heart" part 4
Volume 1 - Chapter 24 25