I've just realized that I have A LOT of Christmas music in my published and unpublished inventory. Here's a comprehensive listing that should help when planning your holiday flute music needs. I've also included books that have a few Christmas titles in case that's just the piece you're looking for! Click on any title for purchasing information.

FLUTE CHOIR
The Christmas Banquet - ALRY
Ding Dong Deck - ALRY
Handel’s Messiah (in 5 Minutes) - ALRY
I Wonder As I Wander – SMP Press
Jolly on a House Top (Low Flutes) - ALRY
The Nutcracker (in 5 Minutes) – ALRY
Pat-A-Carol – ALRY
The Sleigh Ride (Leopold Mozart) – ALRY
White Christmas – SMP Press
An Amazing Silent Night (Expandable) – available from Nish Music
We Saw Three Ships – available from Nish Music
Yet Another Christmas Medley – available from Nish Music
 
4 FLUTES (inc. Alto Flute)
Gloria Fantasie – ALRY
Quick Study Quartets – ALRY

• Greensleeves
• Jingle Bells

Three “Nutcracker Suite” Dances – ALRY (+ Alto)
 
2 FLUTES
Christmas Joy for Flute Duet – Hal Leonard (Shawnee Press)
Soaring Spirits – 20 Spirituals & Hymns for Flute Duet – Hope Publishing

• Go, Tell It on the Mountain
• Jesus, Oh, What a Wonderful Child

Christmas Night (and Day) – ALRY (+ Piano)
 
FLUTE AND PIANO
The Nutcracker (5 Minutes) – ALRY
Christmas Jubilation – Hal Leonard (Glory Sound)
Give Me a Jingle (Jingle Bells) – available from Nish Music
The Celtic Christmas Piper (Piccolo+Piano) – available from Nish Music
 
FLUTE ALONE
The Christmas Flutist – ALRY
The Lyrical Flutist – ALRY

• Go, Tell It on the Mountain
  
• Panis Angelicus