I just finished booking a trip SEA-AUS, and had searched on both nwa.com and delta.com. For whatever reason, nwa.com gave me a cheaper fare that never came up on delta.com, using either search by price or schedule.

Both sites gave me the same outbound, SEA-ATL-AUS, and both showed a return of AUS-MEM-MSP-SEA, but only nwa.com offered a slightly different flight option on the return that dropped the price $500.

I could only get the AUS-MEM-MSP-SEA on delta.com using the schedule search option, and then it offered this routing only in F class.

Nwa.com offered this routing with the same departure flight from AUS, but then a later flight from MEM (dep at 10am vs 830) and a later flight from MSP (dep at 320pm vs 1145).

I have been trying to do everything on delta.com, but I keep finding some better options that are lower cost on nwa.com.

Is this normal, and someting that will end when both systems are completely integrated, or does delta.com just not offer lower cost options when it deals with nw flights?

The routing I booked also shows up when searched using ITA and specified DL as the carrier.

If you find something good some other way (such as ITA) but it is not offered on delta.com, is there any way to force an addition search for what you found or do you have to call res to book it?

Thanks