Pre-approval for travel by your department is always required, per University of Colorado APS 4024.
You may also need pre-approval from the sponsor, even if the trip was included in your proposal budget. While sponsor funding demonstrates approval, DOE, DPA and ARO generally have more restrictive terms that require pre-approval. This condition is part of award terms and conditions. Changes in travel due to a change in the statement of work require that the statement of work change be approved by the sponsor. If you’re not sure if your sponsored project travel needs to be approved, check with your Grant or Contract Officer in OCG.
Note that the most restrictive terms on an individual award must be followed regardless of sponsor.