Cheap same day round trip anywhere
 

Try google flights. Use IAH for the outbound city, leave the return city blank, put in a date - the same one for both the outbound and return, hit search. You should also be able to narrow down by airline.

Or matrix.itasoftware.com , where you can search for an entire month at a time. You do have to put destinations, but you can try like 25 at a time. In the Advanced Controls, put ua+ (at least one ua segment) or ua ua+ (at least 2, etc.) in the routing codes boxes, then f !bc=n in the extension code boxes (to avoid basic economy, which won't earn PQSes). Select a calendar, a date, and 0 nights.

ORD, DFW, ATL, EWR... a bunch of major cities have sub $200 r/t fares for same day travel on UA for random dates throughout the rest of the year. Use Google Flights (set UA as the airline, IAH as the airport, and 0 day trip for the duration).

If you are looking primarily for segments, there are flights from IAH to GRB/ATW through ORD for around $250 roundtrip in main cabin (4 segments) available in the Fall. There are cheap fares to MSP and PHL in the Fall, but they require non-stop flights. AUS -ABQ with a connection can be done for around $200 roundtrip in main cabin.

You can often add a segment when you do a same-day change; for example, instead of CLE-IAH, you might be able to fly CLE-IAD-IAH and pick up an extra segment.

Check out this thread: https://www.flyertalk.com/forum/unit...ions-wiki.html

The free SDC benefit is one of the best premier perks, IMO. To @jsloan's point in the previous post, it's not uncommon to SDC from ORD-SFO to ORD-TUS-SFO....

While frowned upon by the FT community, it's also possible to SDC a 2nd time, once you've departed. For example, before boarding your ORD-SFO flight, you could SDC to ORD-TUS-SFO. And then, before boarding your TUS-SFO flight, you could SDC to TUS-LAX-SFO. As others have mentioned, it's an easy way to pick up PQM's and PQS' if you have the time.

If you are doing a mileage/segment run, IAH-ORD flights are very cheap (under $200). If you are looking to maximize segments, you could look at United Express flights.

My SFO-LAX last weekend became SFO-FAT and FAT-LAX in same E-175 aircraft. Best of all, SFO-FAT and FAT-LAX were upgraded to first class shortly after SDC.

+1. The SFO-LAX can be like $50 OW. Do this SDC stuff and you can get your 8 segments in quite literally no time.

I also SDCed LAX-SFO to LAX-SAN and SAN-SFO. But decided to go home early instead of playing this fun game. Standby successfully for a 2 pm LAX-SFO oversold flight. Adding segments is fairly easy, but requires time and patience.

How do you go about adding the extra segment? I have a flight tomorrow morning IAH-MSY and back again MSY-IAH tomorrow evening. I looked at the United app and only see the ability to change my flight, not add a segment.

When you go to United app and change your flight, you might see alternate flights available for free. I just tried to do a dummy booking online and United app for IAH-MSY and MSY-IAH, I only saw non-stops, I did not see any connecting flights available. Maybe this city pair does not have any connecting flight option available.

There are many options available when you go from hub to hub.