Air travel is becoming cheaper.
Her work involves a lot of travelling.!!
You do not say 'a travel'.
a long and
difficult journey (NOT travel) through the mountains
I read during the train journey to work.
Did you have a good journey? (=Were you comfortable, was the train on time etc?)
first trip to the States
a business trip
Was it a good trip? (=Did you achieve what you wanted to or have a good time there?)
a voyage across the ocean
The crossing takes 90 minutes.
Have a good flight!
a mediterranean cruise
a cruise around the world