Airline advice? What are the good airlines? What is a good one-way price?

What is a "good price" for a one-way ticket to London (Seattle-->London, that is) in late August? What airline carriers should I stay away from? Which ones are particularly known for their good, or very bad, service? What's Icelandair like? They always seem to have the lowest price, which seems like it could be a bad sign...

Right now I'm seeing these as lowest prices:

 Air Canada $823
 Air France $2089
 American Airlines $1247
 bmi $830
 British Airways $1739
 Continental $832
 Delta $1578
 Iberia $728
 Icelandair $659
 KLM Royal Dutch $1387
 Lufthansa $1707
 Secret Carrier $764
 United $1423
 US Airways $1687

(FYI, I'm waiting to submit my UK visa application. Now I KNOW that they tell you to not book your flight until you actually have your visa granted. However, with some of the ticket prices that are availble right now, I'm wondering if it still wouldn' tbe worth it. If I could get a ticket now for under $700, but would be looking at spending $1200 or more if I wait for two weeks, its might be worth the risk to me. Plus, there is always a chance I could use the ticket anyway for a short vacation on my visitor visa.)

Always check the round trip as they typically can be cheaper. You can look at stats on pricing based on months I believe on kayak and they will also send out notifications when the price goes down.

There is no golden rule but I wish there was!

It's often cheaper to buy a round-trip ticket instead of a one-way, so you might find a better deal on a round-trip ticket (you can either just not use the return leg or you can use it to go back to the US for a visit in a few months_ . As an example, last week I was looking at flights to the US in late November: a round-trip ticket was £513 (about $800), but a one-way was £879 (about $1,400)!

Always check the round trip as they typically can be cheaper. You can look at stats on pricing based on months I believe on kayak and they will also send out notifications when the price goes down.

There is no golden rule but I wish there was!

Thanks, I'll start checking the round-trip ones as well, but at the moment that are considerably more:

 Air Canada $1049
 Air France $1209
 American Airlines $1140
 bmi $1274
 British Airways $1510
 Continental $1136
 Delta $1082
 Iberia $2574
 Icelandair $1250
 KLM Royal Dutch $1089
 Lufthansa $1380
 United $1149


I've been using Kayak's price alert for the last few months. The one-way price has seemed to stay about the same with small ($50 or so) up and downs. I'm worried that pretty soon, though, its going to dive up and stay up since I'm looking at flying in about 4 weeks.

I came over in April 2005 and when I booked my ticket I booked it about 6 months in advance choosing the cheapest return date possible (Which I think was right before Thanksgiving). I think in all it cost me $500 for a return when BA was quoting me well over a $1000 for a one way. I was flying JFK > Manchester though...

As some of you may know when you research prices some of the airlines are not included because they are not in the system. Sneaky airlines.