Taxi service in Paris that I can book in advance?

Yes. I use the G7 app to book a taxi to the airport. It's a flat rate depending on whether you are starting on the Right or Left bank + a 7E charge for pre-booking. I've had excellent luck with them being on time or actually always about 5 minutes early.

Rest assured, there will be taxis available at 6am, as that is prime time for international arrivals from the west. However, if you don't mind adding another app and including your credit card information on it, the G7 app is the way to go. In addition, you can use it while in Paris.

And be sure to book two days ahead, not the day before. Sometimes one day ahead isn’t time enough. But G7 is perfectly reliable, as said.

Let me second 2 days ahead -- we learned this the hard way when G7 had no availability for the airport the next day.

As everyone has said - G7, booked at least a couple of days in advance. Use their English-speaking number, or their app. Fixed rate will be €63 from Right Bank or 72€ from Left Bank (that includes the 7-euro fee to book in advance).

Booking a taxi is the best way to assure your being at the airport when you need to be:

English speaking operator +33 1 41 27 66 99

http://www.taxisg7.com/