Iguazu Border Crossings: how it works in Brazil — first-hand
Short answer
Rely on official taxis or pre-booked private transfers for crossing the border between Foz do Iguaçu and Puerto Iguazú, as Uber and 99 apps do not operate reliably in Argentina. Taxis are recommended for handling border wait times, and many drivers accept Brazilian Reais for the approximately 200 BRL fare.
From real experience
When traveling between Puerto Iguazu (Argentina) and Foz do Iguaçu (Brazil), consider that Uber availability can be inconsistent, especially at Puerto Iguazu airport.
Local "taxi" drivers (bombilas) are often an option and may accept Brazilian Reais. They can also assist with border crossing. Long distances and return trips from the airport can influence driver availability. Cabify is an alternative app that may offer better service in Puerto Iguazu. Having local driver contacts or pre-booked transfers is advisable.
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One-way international car rentals between Brazil and Argentina are practically non-existent or prohibitively expensive.
To travel from Brazil (e.g., Rio) to Argentina (e.g., Buenos Aires) via Iguazu Falls, travelers should fly to Foz do Iguaçu or take long-distance sleeper buses (class 'Cama' with fully reclining seats). For crossing the border at Iguazu, hiring a local taxi driver who coordinates with an Argentinian counterpart is highly recommended for hassle-free transit.
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When crossing the border between the Brazilian (Foz do Iguacu) and Argentine (Puerto Iguazu) sides of the Iguazu Falls with luggage, hiring a taxi is highly recommended.
A fair rate is around 200 BRL, because border control on the Argentine side can take 2 to 3 hours of waiting in line. Travelers can also use the InDrive app to order rides and potentially find cheaper offers.
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The cost of a taxi to cross the border between Puerto Iguazu (Argentina) and Foz do Iguaçu (Brazil) is approximately 200 Brazilian Reais.
Uber operates in Brazil but not reliably in Argentinian Puerto Iguazu. Drivers can be hired to cross the border directly, which is convenient, especially from the Argentinian airport to a hotel in Brazil. Taxis may accept payment in Reais. Hotel reception can assist in arranging taxis.
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Uber works reliably in Foz do Iguaçu (Brazil) but is largely unavailable or non-functional in Puerto Iguazú (Argentina).
Additionally, Uber vehicles cannot be used to cross the international border between Brazil and Argentina; travelers must use public buses, official taxis, or private transfers for the crossing.
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Visiting Foz do Iguaçu involves crossing borders to Paraguay (Ciudad del Este) and Argentina.
Ciudad del Este is a major duty-free shopping hub. Transportation: Use Uber/99 in Brazil and Bolt in Paraguay. Crossing borders via bus is typically more efficient than taxi.
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Transportation at the Iguazu Falls border area: Uber and 99 apps are unavailable in Puerto Iguazú (Argentina side).
Travelers must rely on local taxi services or public buses. Expect significant border crossing delays due to traffic.