Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Swansea to Oslo as you normally would.
For a flight from Swansea to Oslo, you will be flying from Fairwood Comm. Swansea Fairwood Comm (SWS) is just 5.4 mi from the center of the city. Fairwood Comm is the only Swansea airport and it handles 0 outbound flights to Oslo per day. 0 airlines have flights to Oslo from Swansea Fairwood Comm on a regular basis.