"travel often" is correct and usable in written English.
You can use it when you are talking about the frequency of someone doing something. For example, "My goal is to travel often this year."
Regarding these particular changes, travellers are an especially interesting group; if they travel often, they are more difficult to reach using telephone surveys.
International travel often brings on high tipping anxiety.
The Citrons, who travel often, are planning another trip.
It enabled her to travel often to Israel.
Holiday air travel often means delays and frustration.
Nowadays plenty of us travel often and with little fuss.
Like humans, plants and animals travel, often in ways beyond our knowledge and control.
Because we travel often, my daughter has several points of reference to compare and contrast.
BEING in the hotel business, I need to travel, and travel often.
BRUSSELS — As secretary general of the North Atlantic Treaty Organization, I travel often to Washington.
They dropped out of college several times to travel, often to Latin America.
