The M60 Select Bus Service would also work as an alternative. The M60 connects with the N and W trains in Astoria, Queens and with the 4/5/6, 2/3, and A/B/C/D trains in Harlem, Manhattan. It terminates near the Columbia University campus in Morningside Heights, where there is a connection to the 1 train as well.

As with the Q70, the entire M60 + subway trip will cost $2.75/person (including a free transfer to the subway, so long as the transfer to the subway is made within 2 hours of purchasing the M60 ticket at LaGuardia).

Unlike Q70 buses, M60 buses don't always have luggage racks, but service is still very frequent and there should be enough space to get on - even with luggage - at the airport. To avoid crowding on the M60, I recommend transferring to the subway as soon as possible, i.e., to the N or W trains in Astoria. The M60 can become very crowded (and very slow) in Harlem.