Please be aware that Tokyo has multiple airports and that these results are for all airports serving the city.
The best month to fly between Tokyo and Singapore is February and the most expensive month to fly is March. (Average prices, based on 266 datapoints.)
The best day to arrive at Tokyo is Monday and it would be best to avoid Wednesday, as prices are on average 124.76% higher than on Monday. (Average prices, based on 272 datapoints.)
The cheapest airline flying from Tokyo to Singapore is Scoot-Tiger. They are 81% cheaper than All Nippon Airways. (Average prices, based on 281 datapoints.)
The best time to fly is at around 17. (Average prices, based on 556 datapoints.)