What to do
Confirm the new airport code and the exact new departure or arrival time in writing. Ask the airline what ground transport or rebooking help they offer between the two airports. At the same time check trains, buses and local links that run from the new airport toward your final destination or toward a place where you can pick up the original onward plan. Decide quickly whether you can still make the same-day arrival or need to adjust the night.

Three options
First option is to accept the new airport and take the airline’s rebooked flight from there. This keeps everything on one ticket when possible. Extra travel time is usually the transfer between airports plus the new flight duration, often adding two to five hours overall. Cost is frequently zero for the flight change itself if the switch was the airline’s decision, though ground transport between airports may fall on you.

Second option is a train from the city of the new airport to your final destination or to a major hub that still has late connections. Many regions have direct or near-direct rail links that take three to seven hours. You leave the new airport by local transport, board the train, and continue. Tickets bought the same day commonly cost between 40 and 120 euros or dollars.

Third option is a long-distance bus or a combination of bus and regional train. This path is slower, often five to ten hours, but seats remain available longer and the price stays lower, usually 25 to 80 euros or dollars. It works well when rail options are limited or already full.

Cost
The flight rebooking is often free when the airline changes the airport, but anything you arrange yourself - train, bus, extra local transfers - comes from your pocket first. Keep every receipt and the notice about the airport change. Some of those extra costs can be claimed later if the switch was within the airline’s control. Local transport between the original and new airport can add a noticeable amount, so check that price early.

Smart tips
Photograph the official message that announces the new airport and the new times. If the airline offers a shuttle between the two airports, take it only if the timing still leaves enough buffer. Message anyone expecting you with the revised arrival window as soon as you know it. If you buy a surface ticket, choose one with a little slack in case the transfer from the new airport runs late. Keep the original booking reference visible in every conversation.

Summary
A last-minute airport change feels disruptive but the same three routes keep working: stay with the airline’s new flight, switch to a train from the new city, or take a bus combination. Confirm the new details, compare the options side by side, pick the one that limits damage to the rest of the day, and save every piece of paper. Most people who run these checks quickly still reach the destination without the whole journey collapsing.