Flights are running as normal out of Wellington Airport this morning after heavy fog caused significant delays last night.

Fog has lifted in the capital and all flights are running as normal.

Air New Zealand has added four flights to its Wellington services today.

The airline said as at 9pm last night, 60 flights in and out of Wellington had been affected by low lying sea fog. An estimated 2800 passengers had been affected by the delays.

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The airline was at that stage working to re-accommodate passengers on alternative flights and services and asked passengers to keep up to date with flight schedules via its website.

Jetstar spokesman Phil Boeyen confirmed the airline was back to schedule this morning.

"We cancelled eight flights (four return services) in and out of Wellington due to the fog last night," he said.

About 1300 passengers were affected, he said.

But with a mass of moist air sitting over New Zealand there was a chance air flights in and out of the capital could be affected later today.

MetService forecaster Rochelle Fleming said while the fog had cleared there was still a chance it could roll back from Cook Strait this afternoon.

"I wouldn't rule it out but hopefully it shouldn't be as bad as yesterday," she said.

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