I've brought some interesting statistics, this is the distance that each team will have to do during the first phase:
G4 – United States - Natal, Manaus, Recife (5.598 km)
A2 – Croatia - São Paulo, Manaus, Recife (5.522)
A4 – Cameroon – Natal, Manaus, Brasília (4.697)
D1 - Uruguay - Fortaleza, São Paulo, Natal (4.688)
G2 – Portugal - Salvador, Manaus, Brasília (4.537)
A1 – Brazil - São Paulo, Fortaleza, Brasília (4.055)
E1 – Switzerland - Brasília, Salvador, Manaus (3.665)
E3 – France - Porto Alegre, Salvador, Rio de Janeiro (3.512)
F2 – Bosnia-Herzegovina - Rio de Janeiro, Cuiabá, Salvador (3.490)
C3 – Cote 'd Ivoire - Recife, Brasília, Fortaleza (3.344)
E4 - Honduras - Porto Alegre, Curitiba, Manaus (3.289)
D3 – England - Manaus, São Paulo, Belo Horizonte (3.178)
B2 – The Netherlands - Salvador, Porto Alegre, São Paulo (3.155)
D4 - Italy - Manaus, Recife, Natal (3.086)
F4 - Nigeria - Curitiba, Cuiabá, Porto Alegre (2.981)
C4 – Japan - Recife, Natal, Cuiabá (2.777)
H4 – South Korea - Cuiabá, Porto Alegre, São Paulo (2.531)
D2 – Costa Rica - Fortaleza, Recife, Belo Horizonte (2.268)
C2 – Greece - Belo Horizonte, Natal, Fortaleza (2.266)
H3 – Russia - Cuiabá, Rio de Janeiro, Curitiba (2.250)
B4 – Australia - Cuiabá, Porto Alegre, Curitiba (2.225)
G3 – Ghana - Natal, Fortaleza, Brasília (2.122)
B3 - Chile - Cuiabá, Rio de Janeiro, São Paulo (1.932)
H2 – Algeria - Belo Horizonte, Porto Alegre, Curitiba (1.887)
B1 - Spain - Salvador, Rio de Janeiro, Curitiba (1.884)
F3- Iran - Curitiba, Belo Horizonte, Salvador (1.784)
E2 - Ecuador - Brasília, Curitiba, Rio de Janeiro (1.756)
F1 - Argentina - Rio de Janeiro, Belo Horizonte, Porto Alegre (1.680)
G1 – Germany - Salvador, Fortaleza, Recife (1.657)
C1 – Colombia - Belo Horizonte, Brasília, Cuiabá (1.497)
A3 – Mexico - Natal, Fortaleza, Recife (1.064)
H1 – Belgium - Belo Horizonte, Rio de Janeiro, São Paulo (696)
I didn't expect that FIFA would make the same mistake that CBF (Brazilian Football Confederation) does on the local league, scheduling absurd trips in a short period of time. The right it would be the groups staying in a specific region of the country, but I think FIFA is lacking common sense too ...