Welcome, fellow CWU student! I'm guessing by your profile that you're in flight tech and enjoying your time with Ms. Sloan and Mr. Wilson, eh? Not sure if you know of me, but I'm the Aviation Management guy who ended up in Japan teaching instead of flying...
Seattle to London...
British Airways offers a daily flight that leaves in the evening, last time I checked. It used to be in a very dirty 747-200, but the aircraft has since been upgraded to a 747-400. I have heard mixed reviews, some really like it, others don't.
You can fly Northwest to Amsterdam on a lovely DC-10 and be bored out of your mind for 10 hours (been there, done that), then get lost in Amsterdam and take a KLM flight to London (fill in the blank with the airport of your choice).
You can fly Northwest to Detroit and catch an A330-300 (don't let Sloan convince you that Airbusses are bad, the A330 is a SWEET bird) to Europe and go from there. Brand new birds, brand new paint, and they do have IFE, from what I hear.
You can fly to Chicago or LAX
or Dallas or New York and take a United or American Airlines flight...
Continental is not bad either...if you're on one of their 777's (I took one from Houston to Tokyo in 2002, we had IFE, comfy 3-3-3 coach seating, very nice, and some old guy decided to die during the flight...I'll tell that tale another day). Try to see if you can fly them from Houston or Newark to London. If they have one from Houston, you may need to take a red eye that leaves Seattle at 12 midnight to connect...it's usually a 737-800, no winglets. Not that bad, really.
Or if you have cash to burn and only want the best...Fly to LAX
, and catch Singapore Air and fly across the other side of the world. Non-stop drink cart, awesome service, tons of IFE...I have taken Singapore before, and they are great.
Air Canada may be another option if you can catch the Seattle to Toronto flight (Airbus A320) and it connects with a flight to London. Or perhaps there's one out of Vancouver. Vancouver is a very good airport. Air Canada may not have coach IFE at every seat, but they usually have movies playing on TV
's every few seats, audio entertainment, and food that is a FAR
CRY above anything that any United States airline offers.