http://stackoverflow.com/questions/19208488/using-url-for-across-blueprints

__init__.py

from flask import Flask, Blueprint, redirect, url_for                          

### pages blueprint
pages = Blueprint('pages', __name__)

@pages.route('/')
def index():
    return 'pages index'


### user blueprint
user = Blueprint('user', __name__)

@user.route('/login')
def login():
    return redirect(url_for('pages.index'))


### thuh app
app = Flask(__name__)

app.register_blueprint(user)
app.register_blueprint(pages)

when you use url_for('pages.index') which pages?

pages = Blueprint('pages', name)
^^^^^^ (or) ^^^^^

P.S. I landed here from http://stackoverflow.com/questions/19208488/using-url-for-across-blueprints
I am also having similar issue with blueprinting

use app.url_map look result.