In September, schools could remain closed if swine flu escalates over the summer, according to official guidance.
The Department for Children, Schools and Families (DCSF) said it "cannot be certain what the situation will be" in the autumn.
But the DCSF added it did expect schools and nurseries to open as usual at the start of the academic year. The total number of deaths linked to swine flu in the UK now stands at 29.
The DCSF said in a message to schools that although about 1,000 sites have recorded cases of swine flu, most have remained open.
In an attempt to contain the virus, affected schools were closed at the start of the outbreak. However, the UK has now moved away from containment.
Looking at the infection day by day, the DCSF will monitor developments over the summer. It said: "We expect that schools and early-years and childcare settings will reopen as usual, but at this time, we cannot be certain what the situation will be then; we will need to monitor developments over the summer, and take decisions based on the best advice available shortly before the start of term."