Channel Tunnel rail services were hit by delays of up to four hours after migrants clashed with police.
Road traffic was blocked after police fired tear gas to disperse hundreds of migrants from the Calais "Jungle" camp on Monday, the AFP news agency said.
Several people had managed to board lorries and attempted to enter their trailers, it said.
Passengers travelling from France to Britain had faced four-hour delays. Eurotunnel said Le Shuttle services were operating to their normal schedule by this morning after the backlog was cleared.
Queues had also been caused by "reinforced security and border checks", it said. No-one was injured during the clashes which involved 200-300 migrants, according to police.
They said at least one person had been arrested for "throwing a projectile".
Eurostar had been forced to reschedule trains from Paris and Brussels to London because only one line remained open in the tunnel. The high-speed passenger service was running normally through the Channel Tunnel this morning.
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