Holiday operator and budget airline Jet2 has suspended flights to Poland as the Russian invasion of neighbouring Ukraine continues.
The airline, which flies out of East Midlands Airport, usually operates two weekly flights from Birmingham, Glasgow, Leeds Bradford and Newcastle airports, and four from Manchester to Krakow.
It said "current circumstances" were behind the decision and affected customers would be given a full refund.
Flights have been cancelled to Krakow between March 24 and May 26.
Since Russia invaded Ukraine, more than one million people have fled the country into Poland, the United Nations has said.
In a statement, the airline said: "Due to current circumstances, we have taken the decision to suspend our flights and city breaks programmes to Krakow from 24th March up to and including 26th May.
"Where customers are affected by any programme changes, we will automatically cancel their booking with a full refund.
"We are planning a phased restart to Krakow from 27th May and we will of course keep customers updated."
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