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Here is what Subway lists as items that don't contain gluten:

Salads
with lettuce, cucumbers, tomatoes, green peppers, red onions, olives and carrots.

Chicken & Bacon Ranch (includes cheese)
Cold Cut Combo
Ham (Black Forest)
Italian BMT®
Roast Beef
Roasted Chicken Breast
Tuna
Turkey Breast
Turkey Breast & Ham
Spicy Italian
Subway Club®
Steak & Cheese
Veggie Delite®

Meat, Poultry, Seafood & Eggs:

Bacon Strips
Chicken Breast Patty
Chicken Strips – plain