The answer is 'it depends'.
When you are suspended from work, under the terms of your employment contract you are entitled to continue to enjoy the renumeration provided for under the terms of the contract. If that specifies two flights a year home under the contract, then 'yes'. This is nothing to do with employment law, but your rights under contract law.
However it is possible that the outcome of the suspension may lead to dismissal with notice, perhaps, and if that happened and the notice period expired before the right to exercise the flight home, then the employer would not be obliged to honour the cost of the flight booked.
There are also some rights to renumeration under Section VII of the Employment Rights Act 1996 (s69) following suspension, but this only extends to the more limited definition of weekly renumeration as being one week's pay.