From BTS Airport:

Budget: NO CROSS BORDER TRAFFIC ALLOWED.

Avis: NO ENTRY INTO CIS, ROMANIA, BULGARIA, CROATIA, POLAND AND
YUGOSLAVIA.

Hertz: CUSTOMERS MAY NOT DRIVE INTO OR DROP CAR IN THE FOLLOWING
- ALBANIA, ANDORRA, ARMENIA, AZERBAIJAN, BELARUS, BSN-HZGVNA,
BULGARIA, ESTONIA, FINLAND, GEORGIA, GREECE, IRELAND, KYRGYZSTAN,
LATVIA, LITHIANIA MACENDONIA, MOLDOVA, NORWAY, PORTUGAL,
ROMANIA, RUSSIA, SWEDEN, TURKEY, UK, UKRAINE SERBIA AND
MONTENERGRO, KOSOVO, ANY AFRICAN COUNTRY, ANY ASIAN COUNTRY,
ANY MIDDLE EAST COUNTRY ANY ISLAND. . CARS MAY BE DRIVEN
TO AND DROPPED IN THE FOLLOWING - AUSTRIA, BELGIUM, FRANCE,
GERMANY, ITALY, LUXEMBOURG, MONACO, NETHERLANDS, POLAND,
SLOVENIA, SWITZERLAND. . CARS MAY BE DRIVEN TO AND DROPPED
INTO ZAGREB/.RIJEKA IN CROATIA. CARS MAY BE DRIVEN TO BUT
NOT DROPPED INTO ANY OTHER LOCATION IN DENMARK. . CARS
MAY BE DRIVEN TO AND DROPPED INTO COPENHAGEN IN DENMARK.
CARS MAY BE DRIVEN TO BUT NOT DROPPED INTO ANY OTHER LOCATION
IN DENMARK. CARS MAY BE DRIVEN TO AND DROPPED INTO BUDAPEST
IN HUNGARY. CARS MAY BE DRIVEN TO BUT NOT DROPPED INTO
ANY OTHER LOCATION IN HUNGARY. . CARS MAY BE DRIVEN TO
AND DROPPED INTO MADRID/BARCELONA IN SPAIN. CARS MAY BE
DRIVEN TO BUT NOT DROPPED INTO ANY OTHER LOCATION IN SPAIN.
IN ADDITION CUSTOMERS MUST NOT TAKE THE CAR BY BOAT OR
OTHERWISE OFF THE EUROPEAN CONTINENT. CUSTOMERS IGNORING
THESE RESTRICTIONS HAVE NO PUBLIC LIABILITY INSURANCE AT
ALL AND CDW,TP,PAI IF ACCEPTED ARE NIL AND VOID. CUSTOMERS
IGNORING THESE RESTRICTIONS ARE FULLY RESPONSIBLE IN CASE
OF ACCIDENTS, LOSTS AND FOR ALL CONSEQUENCES OF ACCIDENTS
INCLUDING THE COSTS OF REPATRIATION OF THE DAMAGED CAR.
PLEASE REFER TO ENVIRONMENTAL ZONES IN THE GERMAN RENTAL
QUALIFICATION AND REQUIREMENTS IF YOU INTEND TO DRIVE TO
OR DROP THE VEHICLE IN GERMANY. . EMISSION STICKERS -----------------
THE GERMAN MINISTRY OF ENVIRONMENT HAS INTRODUCED ENVIRONMENTAL
ZONES IN CERTAIN GERMAN CITIES. ALL VEHICLES ENTERING THESE
ZONES MUST DISPLAY A STICKER INDICATING THE EMISSION CLASS
OF THE VEHICLE. FOR VEHICLES NOT DISPLAYING SUCH A STICKER
THE DRIVER MAY BE SUBJECT TO A FINE OF EUR 40.00. THIS
APPLIES TO ALL GERMAN LICENCED VEHICLES AND ALSO TO ALL
FOREIGN VEHICLES THAT ARE LICENCED OUTSIDE GERMANY. ALL
HERTZ GERMANY CARS CARRY THIS STICKER. HOWEVER, HERTZ CARS
RENTED OUTSIDE GERMANY DO NOT CARRY A STICKER. . PARKING
AND TRAFFIC FINES -------------------------- AN ADMINISTRATION
FEE WILL BE CHARGED TO CUSTOMER PER EACH PARKING OR TRAFFIC
FINE/PENALTY. THE FOLLOWING AMOUNTS ARE EXCLUSIVE OF TAX
- EUR 12.50

Enterprise/National/Alamo: CROSS BORDER TRAVEL - ALL RENTERS INTENDING TO DRIVE THE
RENTAL VEHICLE CROSS BORDER MUST ADVISE CZECHOCAR-ALAMO
AT THE TIME OF RENTAL. A CROSS BORDER FEE OF 30.00 EUR
PLUS VAT PER RENTAL APPLIES. PAYMENT OF THIS FEE GUARANTEES
ASSISTANCE SERVICES ABROAD. THE RENTAL COMPANY PROHIBITS
TRAVEL OUTSIDE OF THE SLOVAKIA BORDERS WITH THE RENTED
VEHICLE WITHOUT THE PAYMENT OF THE CROSS BORDER FEE. SHOULD
RENTERS DRIVE THE RENTAL VEHICLE OUTSIDE OF SLOVAKIA HAVING
NOT DISCLOSED THEIR INTENTIONS TO DO SO AND HAVING NOT
PAID THE CROSS BORDER FEE THEY WILL BE LIABLE FOR ALL ADDITIONAL
ASSISTANCE AND VEHICLE RECOVERY FEES. CROSS BORDER TRAVEL
IS NOT PERMITTED INTO- ALBANIA, BULGARIA, BOSNIA AND HERZEGOVINA,
BELARUS, CYPRUS, ESTONIA, ISRAEL, IRAN, ICELAND, LITHUANIA,
LATVIA, MONTENEGRO, MOLDOVA, MACEDONIA, ROMANIA, RUSSIAN
FEDERATION, SERBIA, TURKEY AND UKRAINE. CROSS BORDER TRAVEL
IS PERMITTED INTO - ANDORRA, AUSTRIA, BELGIUM, GERMANY,
DENMARK, SPAIN, FRANCE, FINLAND, UNITED KINGDOM, GREECE,
HUNGARY, CROATIA, ITALY, IRELAND, LIECHTENSTEIN, LUXEMBOURG,
NORWAY, NETHERLANDS, PORTUGAL, POLAND, SWEDEN, SLOVENIA,
SWIZTERLAND AND CZECH REPUBLIC.

Europcar: * CROSS BORDER RESTRICTION * . NOT ALLOWED TO DRIVE TO BELARUS,
RUSSIA, ROMANIA, BULGARIA, ALBANIA, MACEDONIA, GREECE,
CROATIA, SERBIA, BOSNIA HERZEGOVINA, ESTONIA, MONTENEGRO,
MOLDOVA, UKRAINE, LATVIA, LITHUANIA, MALTA, CYPRUS, TURKEY
FOR ALL CAR GROUPS. POLAND AND CROATIA ALLOWED ONLY FOR
EDMR, CDMR, CDMD, IDMR, IDAR, IWMR, IWAR.

Sixt: --- CROSS BORDER RENTALS --- ARE ALLOWED TO THE FOLLOWING
COUNTIRES - AUSTRIA, BELGIUM, BULGARIA, CROATIA, CZECH
REPUBLIC, DENMARK, FINLAND, FRANCE, GERMANY, GREAT BRITAIN,
HUNGARY, IRELAND, ITALY, LIECHTENSTEIN, LUXEMBOURG, NETHERLANDS,
NORWAY, POLAND, PORTUGAL, SLOVENIA, SWEDEN, SWITZERLAND,
SPAIN.