Travellers using Don Mueang have been advised to spare additional time to go to the airport due to the construction of the bridge linking the compound.
Immigration Bureau spokesman Pol Col Cherngron Rimphadee on Tuesday advised travellers to allow more time than usual, or around three hours, to get to the airport.
The advisory came after traffic congestion on Vibhavadi Rangsit Road outside Don Mueang since the closure of the bridge on Monday for renovation. The bridge will be demolished and a new one will be built in a nearby location to end the traffic bottleneck on the area.
The new bridge will be opened to motorists in September next year.
The heavy traffic could cause passengers to miss their flights and the bureau said it will assign special immigration lanes at Don Mueang for travellers arriving late at the airport.
More officials will be deployed during peak periods and long holidays, including the New Year celebrations, he added.
Don Mueang is the hub of domestic and international flights for low-cost airlines.