By plane


 
 
There are two main airports serving Paris: Orly Airport and Roissy-Charles-de-Gaulle Airport.
There is also the Beauvais-Tillé Airport (80km from paris). This small international airport mostly welcomes low-cost airlines such as Ryanair and Wizz Air.
 
More informations about airports here:
 
http://www.parisaeroport.fr / (english) http://www.parisaeroport.fr/en/homepage
 
http://www.parisaeroport.fr/en/passengers/access/paris-charles-de-gaulle/public-transport
 
To reach the capital city, there are several solutions of transfer from the three airports to Paris (http://www.parisnet.com/airport_transfers.html).
 
 
* From Roissy-Charles-de-Gaulle Airport to Paris
 
Taxi
Taxis from the airport to the city center are quite expensive.
From Charles de Gaulle Airport to Left Bank (south): 50€
From Charles de Gaulle Airport to Right Bank (north): 55€
http://www.aeroportsdeparis.fr/en/passengers/access/paris-charles-de-gaulle/taxi/paris-cdg-taxi
 
Rail
One of the quickest and cheapest ways to travel into the centre of Paris is by the RER B (blue) train line that has station stops at both Terminal 2 and Terminal 3 of the airport. (Note Terminal 2 has seven sub-terminals, but all sub-terminals can be accessed by foot or via the free N1, N2 and N3 shuttle buses). If you arrive in Terminal 1, take the free shuttle train to Terminal 3, which is the easiest station to catch the RER B from. You can buy train tickets from one of the blue ticket machines (not the yellow machines, which sell TGV tickets only) or from a train station employee in a booth. Tickets cost 9.25€ one-way and the journey takes up to 50 minutes. Make sure you take the RER B line heading in the direction of Robinson, Antony or St-Rémy-les-Chevreuse and the train will stop in central Paris stations such as Gare du Nord. Trains run from Charles de Gaulle Airport to Paris between 04:46 and 23:56 Monday to Sunday.
For more informations : http://www.ratp.fr/en/ratp/r_61596/access-to-airports/.
 
Buses
The Roissybus is one of the most popular buses to take from Charles de Gaulle Airport to the centre of Paris. The bus leaves from all three terminals and runs from 06:00 to 23:00 every day. They run every 15 minutes until 20:45, and then every 20 minutes until 23:00. Tickets cost 9.25€ one-way (you can buy them on the bus, so make sure you have some euros with you) and the journey takes up to an hour, terminating in the Opéra area.
A cheaper option is to travel by local bus numbers 350 or 351, which run through the suburbs of Paris and stop frequently. Departing from Terminals 1 and 2 every 20 minutes (or every half an hour during the weekend) between about 06:00 and 22:30, the journey can take up to two hours, depending on the time of day. As the most economical option, the fare costs 5.70€ one way and you can buy tickets on-board. The 350 terminates at Gare de l’Est and the 351 terminates at the Nation terminus between the 11th and 12th arrondissements.
If you’re arriving at night, night buses N140 and N143 run seven days a week and depart from all three terminals. Bus N140 runs hourly to Paris between 01:00 and 03:00, while the N143 runs from midnight until 04:30 at half-hourly intervals. Both buses terminate at Gare de l’Est and one way tickets cost 5.70€, available to buy on-board the bus.
 
 
* From Orly Airport to Paris
 
Taxi
Taxis from the airport to the city center are quite expensive.
From Orly Airport to Left Bank: 30€
From Orly Airport to Right Bank (north):: 355€
http://www.aeroportsdeparis.fr/en/passengers/access/paris-orly/taxi/taxi
 
Rail
One of the most time-effective ways to travel into Paris from Orly Airport is by the RER. The closest RER station is at Antony, accessed from the South or West terminals by the airport’s driverless light rail transit line, the Orlyval. The combined fare for the Orlyval and RER is 11.30€ one-way and tickets can be bought from ticket booths before departure. The Orlyval departs every few minutes between 06:00 and 23:00 and the journey takes 10 minutes. From Antony RER station, take the B (blue) line going in the direction of Mitry-Claye or Charles de Gaulle Airport. The journey takes about eight minutes into central Paris.
It’s also possible to travel to central Paris by the RER C line, which is cheaper and takes only slightly longer than the RER B/Orlyval route. Shuttle trains connect both airport terminals to Pont de Rungis-Aéroport d’Orly RER station between 05:00 and 23:30 every 20 minutes, with a journey time of 10 minutes. The fare is significantly cheaper than the Orlyval at just 2.50€ per person. From Pont de Rungis station, take the RER C (yellow) line towards Pontoise or Montigny Beauchamp. The RER C route into central Paris takes approximately 25 minutes and costs 3.90€ one-way.
For more informations : http://www.ratp.fr/en/ratp/r_61596/access-to-airports/.
 
Buses
The Orlybus is one of the most popular bus travel options from Orly Airport to the centre of Paris. The bus departs from both terminals every 10 to 20 minutes between around 06:00 to 23:00. The transfer time into Place Denfert-Rochereau in the centre of Paris takes just 30 minutes and costs 7.20€ one-way; tickets are available to buy on-board.
Local bus numbers 183 and 285 provide even cheaper links into central Paris locations. The 183 bus departs from the South Terminal every 30 minutes, terminating in Porte de Choisy after a 45-minute journey. The fare costs just 1.90€ one-way and tickets can be bought on-board. The 285 bus also departs from the South Terminal and the journey to the Villejuif and Louis Aragon areas of Paris takes just 15 minutes. This fare also costs 1.90€ one-way and the service runs every 10 to 20 minutes Monday to Saturday, with a half-hourly service on Sundays. Both buses operate between approximately 05:00 and 01:00 Monday to Sunday.
 

 
 
* From Beauvais-Tillé Airport to Paris
 
Taxi
This option is quite pricey but direct and simple. The journey to the centre of Paris will cost between 140€ and 160€ during the day and between 160€ and 180€ at night. The journey will take around 1h and 1h30.
 
Train
The TER train (Regional Express Train) is one of the most popular means of travel from Beauvais Airport. You can take a shuttle at the airport which will take you to Beauvais train station (less than 5km from the airport) for 4€. You could also take a taxi to the station which costs 13€ during the day and 16€ at night. You then need to take the train to Gare du Nord in the centre of Paris for around 14€. The journey takes between 1h10 and 1h20. You can buy your tickets directly at the ticket office or using the blue ticket machines. You also have the option of buying your ticket online on the the SNCF website : http://www.voyages-sncf.com / (english) https://uk.voyages-sncf.com/en/#/
 
Aérobus
The most practical and fastest option is to take the aérobus which takes you from the airport to Porte Maillot in the west of Paris. These buses are lined up and are easy to spot when you leave either one of the terminals. You can buy your ticket online in advance or at one of the aérobus machines just outside the terminals. The buses leave around 20/25 minutes after each plane lands. To do the opposite journey from Paris to Beauvais-Tillé Airport, you need to take a bus 3h15 minutes before your departure from Porte-Maillot.