I have checked ual.com for meals via the award ticket functionality. There are no meals shown on any flight between DCA-ORD-DCA. If it is indeed the case that Snack is not shown on any flight on UAL.com than the award ticket search is useless.

USAirways does codeshare the DCA-ORD with UA as the first segment of DCA-ORD-MKE so we should be able to seal if a snack is being served by looking at it that way.

UPDATE:

OK. I am looking at the ITA flight search and priced it as a US F Class ticket on flights operated ny IA, DCA-ORD-MKE and for the 12:40 flight listed as lunch--not a SNACK.

ANYBODY WHO HAD FLOWN THIS ROUTE CARE TO WEIGH IN? UA is driving me NUTS!!

Washington, DC to Milwaukee, WI: 676 miles 6 hrs 6 min

US Airways Flight US6281 on a Boeing 737 (jet) in first class
(operated by United Airlines as Flight UA617)
(lunch)
Departs Washington, DC (DCA) Tue, July 17 12:40p 2 hrs 4 min
Arrives Chicago, IL (ORD) 1:44p
Layover in Chicago 3 hrs 16 min
US Airways Flight US7334 on a Canadair Reg. Jet (jet) in coach class
(operated by UNITED EXPRESS/SKYWEST, also United Airlines Flight UA5829)
Departs Chicago, IL (ORD) Tue, July 17 5:00p 46 min
Arrives Milwaukee, WI (MKE) 5:46p