Greyhound Bus Lines is often, but not always, the cheapest way to go on a long trip. I definitely wouldn't recommend their services though. The trips often take much longer than planned. The busses are often filthy and uncomfortable. The staff is often rude, and I have had all of my luggage lost, never to be seen again. Also, the Tulsa station is right downtown. I wouldn't consider that a safe place to be waiting at night. All in all, I would not recommend Greyhound unless it is your only available option.
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