generally speaking, for domestic travel (and to the caribbean), a RT ticket is pretty much the sum of each OW if purchased separately...although we usually buy 2 OWs, i have noticed that sometimes the sum of the 2 OWs comes out $10-30 more than the RT, when making the comparison on the same purchase date...if you buy each OW on different dates, then the difference compared to RT can be substantially greater due to daily fluctuations in fares
but for travel to europe, this is not true...a OW can cost as much or more than a full RT...the airlines really try to stick it to business travelers...luckily this doesn’t apply to using points/miles for tix
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