If you take the train to EWR, CO has EWR-DCA and vv for $149 all in. I was thinking I was going to have to do one of those until an angel at the WP service center found a flight that I took earlier in the year that somehow earned an additional 500 miles more than it had originally posted for. Don't know what s/he did, but it saved me the flight and a night at the EWR Hilton.