This card offers a few thrills if you are one for accumulating miles as you can earn 1.3 KrisFlyer miles for every S$1 equivalent in foreign currency spent overseas on eligible purchases up to S$3,800 each month. On such purchases above S$3,800 each month, you can earn 2 KrisFlyer miles. Furthermore the card allows earnings of 1.3 KrisFlyer miles for every S$1 spent locally in Singapore dollars on eligible purchases up to S$3,800 each month. On such purchases above S$3,800 each month, earnings are 1.4 KrisFlyer miles. Highly recommended for those who seek to accumulate miles.
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Unfortunately, even as Citi SMRT is a very decent card for spending, they specifically exclude travel related online merchants. That being the case, it may not favour your online spend with travel websites. You might need to get another card for travel websites.