How to come to IAP:
IAP is located at 98 bis, boulevard Arago, in the 14th "arrondissement", very close to Place Denfert-Rochereau and the Denfert-Rochereau metro lines 4, 6, and RER-B (suburban) stations.
| From | Means | Duration | Frequency | Cost | 
| Charles de Gaulle Airport | 
				RER B 
				 direct to Denfert-Rochereau  | 
				45 min | 15 min | 7.85€ | 
| Taxi | 40 min - 1h20 | 30 sec | ~50€ | |
| Orly Airport | 
				OrlyBus  
				 direct to Denfert-Rochereau  | 
				20-40 min | 30 min | 5.8€ | 
| 
				OrlyVal  change at Antony to RER B  | 
				30 min | 4-7 min | 8.85€ | |
| Taxi | 20-40min | 30 sec | ~21€ | |
| Gare de Lyon (TGV from Switzerland, Italy or Riviera) | 
				RER 
			A  change at Châtelet-Les Halles to RER B  | 
				17 min | 5 min | 1.4€ | 
| Taxi | 15-30 min | 30 sec | ~7 € | |
| Gare du Nord (TGV from London or Brussels) | 
				RER B  direct to Denfert-Rochereau  | 
				11 min | 5 min | 1.4€ | 
| Taxi | 20-40 min | 30 sec | ~9€ | |
| Gare de l'Est (train from Germany) | 
				Metro line 4  direction Porte d'Orléans direct to Denfert-Rochereau  | 
				25 min | 3 min | 1.4€ | 
| Taxi | 20-40 min | 30 sec | ~9€ | |
| Gare Montparnasse | 
				Metro line 6  direction Nation direct to Denfert-Rochereau  | 
				10 min | 3 min | 1.4€ | 
| Taxi | 10-20min | 30 sec. | ~5€ | 
Here are two maps of Paris metro: interactive (seeking for route or stations, estimated time, station index) or detailed.
      
      
From 
      "Place Denfert Rochereau":
Here is a map of the district (click on it for a bigger version).
Here is a map from the hotel "Raspail Montparnasse" to IAP:
Institut d'Astrophysique de Paris - 98 bis boulevard Arago - 75014 Paris | Contact: peirani AT iap.fr