All United Airlines flight numbers

United Airlines’s own profile links its strongest and weakest departures only. This is the complete set: every United Airlines flight number with enough operating history to clear FlyerIntel’s publishing bar, still flying its current route, July 2023 – June 2026.

Every published flight number

332 numbers, ordered by operations recorded on the route each one currently flies.

All United Airlines flight numbers
#	Flight	Route	Operations	On time
1	UA2143	EWR → SJU Newark to San Juan	1,096	75.2%
2	UA1556	EWR → SJU Newark to San Juan	1,096	77.8%
3	UA2219	SJU → EWR San Juan to Newark	1,096	78.2%
4	UA1170	LAX → HNL Los Angeles to Honolulu	1,096	82.1%
5	UA2088	SJU → ORD San Juan to Chicago	1,096	75.0%
6	UA253	IAH → HNL Houston to Honolulu	1,096	69.9%
7	UA1192	IAH → SJU Houston to San Juan	1,096	78.6%
8	UA1173	SJU → EWR San Juan to Newark	1,096	66.9%
9	UA252	HNL → IAH Honolulu to Houston	1,096	86.3%
10	UA383	HNL → DEN Honolulu to Denver	1,096	87.9%
11	UA1013	DEN → LAX Denver to Los Angeles	1,096	85.4%
12	UA1175	SFO → HNL San Francisco to Honolulu	1,096	85.4%
13	UA668	SJU → IAH San Juan to Houston	1,096	75.7%
14	UA757	SEA → DEN Seattle to Denver	1,096	84.4%
15	UA1996	ORD → SJU Chicago to San Juan	1,096	82.2%
16	UA219	ORD → HNL Chicago to Honolulu	1,096	84.8%
17	UA384	DEN → HNL Denver to Honolulu	1,096	79.3%
18	UA302	DTW → DEN Detroit to Denver	1,096	83.4%
19	UA1158	LAX → HNL Los Angeles to Honolulu	1,095	85.7%
20	UA777	ORD → LAS Chicago to Las Vegas	1,095	76.5%
21	UA218	HNL → ORD Honolulu to Chicago	1,095	91.4%
22	UA787	IAH → ORD Houston to Chicago	1,094	71.0%
23	UA498	DEN → PDX Denver to Portland	1,093	74.5%
24	UA2036	SJU → EWR San Juan to Newark	1,093	81.2%
25	UA747	SEA → ORD Seattle to Chicago	1,093	84.8%
26	UA303	MCI → ORD Kansas City to Chicago	1,093	81.6%
27	UA647	BOS → DEN Boston to Denver	1,093	89.1%
28	UA226	BOS → IAH Boston to Houston	1,093	91.8%
29	UA1543	EWR → SJU Newark to San Juan	1,093	62.3%
30	UA1208	DEN → SMF Denver to Sacramento	1,093	82.4%
31	UA1740	ORD → RSW Chicago to Fort Myers	1,092	91.3%
32	UA586	DEN → MCI Denver to Kansas City	1,091	84.0%
33	UA2146	LAX → DEN Los Angeles to Denver	1,091	77.4%
34	UA590	BWI → ORD Baltimore to Chicago	1,089	64.3%
35	UA544	IAH → CLE Houston to Cleveland	1,088	85.8%
36	UA414	BOS → DEN Boston to Denver	1,081	90.3%
37	UA1645	CLE → IAH Cleveland to Houston	1,080	87.7%
38	UA259	DEN → MCO Denver to Orlando	1,076	73.6%
39	UA1509	SFO → HNL San Francisco to Honolulu	1,075	81.1%
40	UA1607	IND → DEN Indianapolis to Denver	1,074	86.4%
41	UA641	IAD → BOS Washington to Boston	1,072	91.8%
42	UA1520	MCO → DEN Orlando to Denver	1,072	86.4%
43	UA655	DEN → LAS Denver to Las Vegas	1,071	71.6%
44	UA1492	ORD → CMH Chicago to Columbus	1,071	67.6%
45	UA1415	DEN → SMF Denver to Sacramento	1,066	82.5%
46	UA2102	LAS → ORD Las Vegas to Chicago	1,065	89.9%
47	UA300	SFO → HNL San Francisco to Honolulu	1,061	81.6%
48	UA1362	DEN → BWI Denver to Baltimore	1,060	87.6%
49	UA1959	ANC → DEN Anchorage to Denver	1,059	85.8%
50	UA2136	BOS → IAD Boston to Washington	1,059	71.9%
51	UA737	SEA → SFO Seattle to San Francisco	1,058	70.4%
52	UA2132	DEN → SMF Denver to Sacramento	1,054	73.8%
53	UA1199	DEN → IND Denver to Indianapolis	1,053	70.5%
54	UA1416	LAX → IAH Los Angeles to Houston	1,051	91.8%
55	UA1869	IAD → SAT Washington to San Antonio	1,051	76.4%
56	UA2125	BNA → IAD Nashville to Washington	1,050	79.0%
57	UA767	ORD → DEN Chicago to Denver	1,050	69.3%
58	UA1073	IAD → MIA Washington to Miami	1,047	86.8%
59	UA617	DEN → ORD Denver to Chicago	1,046	75.8%
60	UA2277	IAD → TPA Washington to Tampa	1,046	86.8%
61	UA1320	DEN → SNA Denver to Santa Ana	1,045	84.6%
62	UA2205	CMH → IAH Columbus to Houston	1,045	84.6%
63	UA1621	LAX → MCO Los Angeles to Orlando	1,043	87.9%
64	UA2021	IAD → SJU Washington to San Juan	1,043	88.4%
65	UA1930	IAD → SAN Washington to San Diego	1,041	90.9%
66	UA1026	DEN → AUS Denver to Austin	1,040	82.4%
67	UA2295	EWR → MIA Newark to Miami	1,039	76.9%
68	UA1895	IAH → PHX Houston to Phoenix	1,032	83.5%
69	UA1281	DEN → SAN Denver to San Diego	1,031	82.8%
70	UA430	DEN → ONT Denver to Ontario	1,030	85.3%
71	UA2188	DEN → FLL Denver to Fort Lauderdale	1,030	81.2%
72	UA658	MSP → ORD Minneapolis to Chicago	1,029	63.6%
73	UA2116	IAD → DFW Washington to Dallas–Fort Worth	1,029	66.3%
74	UA1191	BUR → DEN Burbank to Denver	1,028	86.8%
75	UA1766	BNA → DEN Nashville to Denver	1,028	82.0%
76	UA1635	LAX → IAD Los Angeles to Washington	1,028	86.1%
77	UA1541	DEN → MSY Denver to New Orleans	1,027	74.7%
78	UA575	CLT → IAH Charlotte to Houston	1,027	86.7%
79	UA2476	SAN → DEN San Diego to Denver	1,025	88.9%
80	UA2285	SMF → DEN Sacramento to Denver	1,025	94.1%
81	UA405	DEN → LAX Denver to Los Angeles	1,022	87.9%
82	UA492	EWR → IAH Newark to Houston	1,021	92.4%
83	UA2309	DEN → SAN Denver to San Diego	1,018	87.7%
84	UA1665	SFO → BOS San Francisco to Boston	1,014	81.5%
85	UA1794	IAH → MEM Houston to Memphis	1,008	68.9%
86	UA540	DEN → SAN Denver to San Diego	1,008	69.9%
87	UA379	IAD → MCO Washington to Orlando	1,006	82.9%
88	UA2400	BOS → SFO Boston to San Francisco	1,006	62.9%
89	UA1305	DEN → ATL Denver to Atlanta	1,006	71.4%
90	UA688	IAD → BOS Washington to Boston	1,005	61.5%
91	UA2613	DEN → EWR Denver to Newark	1,004	63.3%
92	UA2117	SAN → SFO San Diego to San Francisco	1,000	79.7%
93	UA574	LAS → SFO Las Vegas to San Francisco	1,000	76.5%
94	UA2272	MSP → DEN Minneapolis to Denver	996	68.7%
95	UA505	SFO → IAH San Francisco to Houston	992	83.6%
96	UA280	DEN → ANC Denver to Anchorage	988	80.8%
97	UA697	DCA → IAH Washington to Houston	986	90.8%
98	UA2329	DEN → ORD Denver to Chicago	985	81.3%
99	UA2129	SAN → IAD San Diego to Washington	985	88.9%
100	UA664	LAS → ORD Las Vegas to Chicago	985	92.7%
101	UA2666	DEN → SNA Denver to Santa Ana	979	90.9%
102	UA1827	SAN → EWR San Diego to Newark	975	89.9%
103	UA1743	IAH → LAX Houston to Los Angeles	973	79.4%
104	UA1545	CLE → IAH Cleveland to Houston	971	85.9%
105	UA595	AUS → DEN Austin to Denver	968	86.4%
106	UA2634	ATL → IAD Atlanta to Washington	967	77.4%
107	UA426	DTW → ORD Detroit to Chicago	966	66.9%
108	UA2235	MSY → EWR New Orleans to Newark	966	74.3%
109	UA2475	MCO → ORD Orlando to Chicago	964	85.0%
110	UA2639	DFW → IAD Dallas–Fort Worth to Washington	961	88.8%
111	UA2087	DEN → IAD Denver to Washington	960	80.1%
112	UA1406	IAD → RSW Washington to Fort Myers	960	88.4%
113	UA516	ATL → ORD Atlanta to Chicago	959	78.9%
114	UA1990	AUS → ORD Austin to Chicago	957	71.9%
115	UA1826	EWR → SAN Newark to San Diego	956	81.7%
116	UA2149	DEN → SMF Denver to Sacramento	954	91.9%
117	UA1644	SJU → IAH San Juan to Houston	954	93.8%
118	UA1938	IAD → PHX Washington to Phoenix	952	77.5%
119	UA1626	EWR → SAN Newark to San Diego	947	78.8%
120	UA327	SAN → EWR San Diego to Newark	946	80.0%
121	UA427	SAN → EWR San Diego to Newark	943	82.1%
122	UA2636	CLE → MCO Cleveland to Orlando	941	92.1%
123	UA563	ORD → EWR Chicago to Newark	941	90.4%
124	UA623	LGA → ORD New York to Chicago	940	87.0%
125	UA1769	RDU → SFO Raleigh–Durham to San Francisco	939	73.0%
126	UA1561	DEN → SFO Denver to San Francisco	938	74.1%
127	UA732	DEN → MSP Denver to Minneapolis	938	79.0%
128	UA1730	LAX → MCO Los Angeles to Orlando	936	89.7%
129	UA1732	BOS → ORD Boston to Chicago	936	89.1%
130	UA489	DEN → IAH Denver to Houston	934	71.3%
131	UA2250	SAT → IAD San Antonio to Washington	933	87.7%
132	UA311	BOS → LAX Boston to Los Angeles	930	86.4%
133	UA1022	DEN → SAT Denver to San Antonio	929	87.0%
134	UA1116	SFO → AUS San Francisco to Austin	929	82.9%
135	UA1716	BNA → DEN Nashville to Denver	925	86.6%
136	UA648	EWR → SFO Newark to San Francisco	925	73.8%
137	UA1983	MIA → ORD Miami to Chicago	922	81.7%
138	UA1247	DEN → PDX Denver to Portland	922	89.5%
139	UA1221	HNL → LAX Honolulu to Los Angeles	922	92.2%
140	UA1240	DFW → IAD Dallas–Fort Worth to Washington	921	77.3%
141	UA2408	DEN → IAD Denver to Washington	921	69.8%
142	UA2269	DEN → RDU Denver to Raleigh–Durham	920	84.8%
143	UA708	MCI → DEN Kansas City to Denver	916	88.5%
144	UA2497	IAD → ORD Washington to Chicago	915	58.3%
145	UA1715	DEN → EWR Denver to Newark	915	66.1%
146	UA2276	IAD → LAX Washington to Los Angeles	913	68.8%
147	UA1140	IAD → TPA Washington to Tampa	912	72.4%
148	UA2065	MCO → IAD Orlando to Washington	911	78.1%
149	UA2196	AUS → IAH Austin to Houston	910	82.7%
150	UA2670	DFW → IAH Dallas–Fort Worth to Houston	910	74.2%
151	UA1046	ATL → ORD Atlanta to Chicago	909	68.5%
152	UA475	DEN → IAH Denver to Houston	909	72.2%
153	UA1976	BOS → IAH Boston to Houston	909	84.8%
154	UA1379	IAD → FLL Washington to Fort Lauderdale	906	78.3%
155	UA358	DFW → IAD Dallas–Fort Worth to Washington	906	83.6%
156	UA1389	CMH → DEN Columbus to Denver	902	77.1%
157	UA1776	ORD → PHL Chicago to Philadelphia	899	65.4%
158	UA1149	SFO → EWR San Francisco to Newark	897	83.8%
159	UA2434	EWR → LAX Newark to Los Angeles	896	82.9%
160	UA1575	DEN → PHL Denver to Philadelphia	893	86.6%
161	UA1431	LAX → HNL Los Angeles to Honolulu	891	84.1%
162	UA486	CLE → DEN Cleveland to Denver	890	84.7%
163	UA340	ATL → DEN Atlanta to Denver	887	89.1%
164	UA1368	SJU → DEN San Juan to Denver	885	77.8%
165	UA1339	DEN → SJU Denver to San Juan	885	76.6%
166	UA2447	AUS → DEN Austin to Denver	884	75.8%
167	UA1101	DEN → IAD Denver to Washington	880	91.1%
168	UA1765	PIT → DEN Pittsburgh to Denver	878	90.1%
169	UA406	LAS → EWR Las Vegas to Newark	877	83.6%
170	UA1310	LGA → ORD New York to Chicago	877	86.5%
171	UA652	DEN → STL Denver to St. Louis	875	84.8%
172	UA2024	SJU → IAD San Juan to Washington	874	80.5%
173	UA1700	LAX → EWR Los Angeles to Newark	870	79.7%
174	UA2331	TPA → IAD Tampa to Washington	870	91.4%
175	UA1792	EWR → DEN Newark to Denver	865	69.4%
176	UA682	SAN → DEN San Diego to Denver	865	76.4%
177	UA2326	ORD → TPA Chicago to Tampa	864	89.0%
178	UA235	ATL → DEN Atlanta to Denver	863	78.4%
179	UA1289	CHS → EWR Charleston to Newark	862	93.2%
180	UA326	IAD → SEA Washington to Seattle	860	76.2%
181	UA2468	EWR → MSY Newark to New Orleans	860	84.7%
182	UA2665	ORD → IAH Chicago to Houston	859	71.6%
183	UA1755	FLL → ORD Fort Lauderdale to Chicago	859	86.1%
184	UA1220	DEN → DTW Denver to Detroit	859	71.6%
185	UA2081	IAD → ATL Washington to Atlanta	857	66.9%
186	UA1668	AUS → SFO Austin to San Francisco	854	80.9%
187	UA2232	ORD → MSP Chicago to Minneapolis	853	90.3%
188	UA2379	SEA → IAH Seattle to Houston	852	81.6%
189	UA1207	EWR → JAX Newark to Jacksonville	851	91.3%
190	UA1093	DEN → LAX Denver to Los Angeles	847	91.0%
191	UA1945	IAH → LAX Houston to Los Angeles	847	82.8%
192	UA2679	EWR → LAX Newark to Los Angeles	845	78.3%
193	UA2377	LAX → IAH Los Angeles to Houston	844	84.9%
194	UA2683	ORD → SAN Chicago to San Diego	840	83.3%
195	UA793	ORD → DFW Chicago to Dallas–Fort Worth	839	73.9%
196	UA662	BOS → DEN Boston to Denver	839	91.2%
197	UA740	IAH → PDX Houston to Portland	833	84.9%
198	UA1490	PDX → ORD Portland to Chicago	832	86.1%
199	UA683	IAD → TPA Washington to Tampa	832	89.3%
200	UA602	ORD → PHX Chicago to Phoenix	832	74.2%
201	UA1886	IAH → EWR Houston to Newark	830	88.5%
202	UA2608	LAS → IAH Las Vegas to Houston	830	96.0%
203	UA2245	IAH → MCO Houston to Orlando	829	91.2%
204	UA1673	CLE → ORD Cleveland to Chicago	829	60.7%
205	UA1157	HNL → LAX Honolulu to Los Angeles	828	82.3%
206	UA728	CMH → DEN Columbus to Denver	825	86.0%
207	UA2453	JAX → IAH Jacksonville to Houston	825	92.0%
208	UA1179	IAH → AUS Houston to Austin	820	81.2%
209	UA500	IND → SFO Indianapolis to San Francisco	820	84.8%
210	UA570	BOS → EWR Boston to Newark	819	90.5%
211	UA701	IAH → SJU Houston to San Juan	816	85.1%
212	UA1793	DCA → ORD Washington to Chicago	815	93.5%
213	UA1687	IAH → IND Houston to Indianapolis	811	82.8%
214	UA2414	ORD → BNA Chicago to Nashville	808	85.8%
215	UA2647	SFO → BOS San Francisco to Boston	808	82.9%
216	UA1605	LAX → BWI Los Angeles to Baltimore	807	90.6%
217	UA2019	LAX → SFO Los Angeles to San Francisco	806	73.8%
218	UA1992	EWR → IAD Newark to Washington	805	64.2%
219	UA632	ATL → IAD Atlanta to Washington	802	88.1%
220	UA2389	LGA → ORD New York to Chicago	796	93.3%
221	UA609	CLE → ORD Cleveland to Chicago	795	90.0%
222	UA2380	SFO → HNL San Francisco to Honolulu	795	76.3%
223	UA1481	DEN → PHX Denver to Phoenix	794	83.8%
224	UA2240	DEN → LAX Denver to Los Angeles	794	76.9%
225	UA578	DEN → DFW Denver to Dallas–Fort Worth	793	80.6%
226	UA1787	DEN → OMA Denver to Omaha	793	70.9%
227	UA1383	IAH → SNA Houston to Santa Ana	792	87.7%
228	UA1849	SFO → IAD San Francisco to Washington	790	82.9%
229	UA2425	EWR → IAH Newark to Houston	788	67.0%
230	UA456	DEN → AUS Denver to Austin	785	91.3%
231	UA2651	DEN → SEA Denver to Seattle	783	69.9%
232	UA2096	LAX → EWR Los Angeles to Newark	780	81.9%
233	UA1608	EWR → BNA Newark to Nashville	780	75.2%
234	UA1947	HNL → SFO Honolulu to San Francisco	777	85.3%
235	UA616	DEN → CLT Denver to Charlotte	776	70.1%
236	UA1689	IAD → LAX Washington to Los Angeles	775	91.6%
237	UA1326	AUS → IAH Austin to Houston	774	67.8%
238	UA2652	ORD → CLE Chicago to Cleveland	773	68.8%
239	UA459	PDX → DEN Portland to Denver	767	96.3%
240	UA2345	DEN → EWR Denver to Newark	764	94.0%
241	UA2153	CLE → SFO Cleveland to San Francisco	761	91.6%
242	UA484	DEN → ABQ Denver to Albuquerque	761	70.4%
243	UA2148	DCA → ORD Washington to Chicago	760	56.8%
244	UA2356	LAS → SFO Las Vegas to San Francisco	758	61.9%
245	UA676	EWR → AUS Newark to Austin	756	71.4%
246	UA1912	LAX → DEN Los Angeles to Denver	756	90.5%
247	UA1007	DEN → SFO Denver to San Francisco	755	68.0%
248	UA1979	EWR → TPA Newark to Tampa	754	92.8%
249	UA2012	BWI → DEN Baltimore to Denver	753	76.0%
250	UA2123	MCI → DEN Kansas City to Denver	752	65.8%
251	UA1995	SFO → LAS San Francisco to Las Vegas	751	83.4%
252	UA739	OMA → ORD Omaha to Chicago	750	72.7%
253	UA2327	DEN → OMA Denver to Omaha	749	82.9%
254	UA1364	EWR → FLL Newark to Fort Lauderdale	747	91.2%
255	UA1525	EWR → ORD Newark to Chicago	744	80.9%
256	UA2486	SAN → ORD San Diego to Chicago	742	83.7%
257	UA2316	DEN → LAS Denver to Las Vegas	741	90.7%
258	UA779	AUS → DEN Austin to Denver	740	89.4%
259	UA555	ATL → EWR Atlanta to Newark	739	65.7%
260	UA2210	LAX → BOS Los Angeles to Boston	734	89.0%
261	UA1783	LAX → BOS Los Angeles to Boston	734	84.5%
262	UA446	EWR → LAS Newark to Las Vegas	733	82.5%
263	UA1442	DEN → LGA Denver to New York	731	89.0%
264	UA1738	IAD → ORD Washington to Chicago	729	79.9%
265	UA611	SFO → LAS San Francisco to Las Vegas	723	79.7%
266	UA376	AUS → IAD Austin to Washington	716	84.0%
267	UA2667	LAX → IAD Los Angeles to Washington	715	89.5%
268	UA1169	HNL → LAX Honolulu to Los Angeles	715	91.0%
269	UA2273	DEN → MSY Denver to New Orleans	715	85.9%
270	UA1720	DEN → IAH Denver to Houston	711	89.3%
271	UA488	BUR → SFO Burbank to San Francisco	709	83.9%
272	UA2040	BOS → ORD Boston to Chicago	708	58.4%
273	UA1006	LAX → LAS Los Angeles to Las Vegas	706	90.1%
274	UA254	EWR → ORD Newark to Chicago	702	47.5%
275	UA644	DEN → PDX Denver to Portland	697	83.5%
276	UA2098	BOS → IAD Boston to Washington	695	90.1%
277	UA1370	TPA → IAD Tampa to Washington	682	73.1%
278	UA2435	IAD → SMF Washington to Sacramento	682	79.0%
279	UA1003	DEN → CHS Denver to Charleston	679	83.2%
280	UA1802	PDX → EWR Portland to Newark	678	85.3%
281	UA638	SFO → HNL San Francisco to Honolulu	677	89.8%
282	UA1233	DEN → EWR Denver to Newark	676	70.6%
283	UA1825	IAD → FLL Washington to Fort Lauderdale	673	87.1%
284	UA1934	IAH → CLE Houston to Cleveland	673	83.2%
285	UA2656	SNA → DEN Santa Ana to Denver	671	86.4%
286	UA2084	IAD → JAX Washington to Jacksonville	671	85.4%
287	UA501	DEN → MCO Denver to Orlando	669	70.9%
288	UA1577	ORD → SFO Chicago to San Francisco	667	76.5%
289	UA674	CHS → EWR Charleston to Newark	663	86.0%
290	UA2095	IAH → LAX Houston to Los Angeles	658	75.0%
291	UA1616	BNA → ORD Nashville to Chicago	658	85.7%
292	UA1302	DEN → SAN Denver to San Diego	658	87.8%
293	UA561	ORD → MCI Chicago to Kansas City	657	81.2%
294	UA347	DEN → IAD Denver to Washington	654	83.0%
295	UA2130	DEN → MEM Denver to Memphis	652	73.2%
296	UA2601	DEN → RSW Denver to Fort Myers	650	85.6%
297	UA1806	HNL → DEN Honolulu to Denver	649	81.7%
298	UA1414	BOS → ORD Boston to Chicago	646	93.3%
299	UA2333	CHS → ORD Charleston to Chicago	646	90.1%
300	UA2474	IAH → MSY Houston to New Orleans	645	84.6%
301	UA1836	DEN → MKE Denver to Milwaukee	643	84.2%
302	UA2022	SJU → IAD San Juan to Washington	643	95.1%
303	UA1638	DEN → LAX Denver to Los Angeles	643	89.7%
304	UA1799	IAH → LAS Houston to Las Vegas	643	86.7%
305	UA1559	SNA → EWR Santa Ana to Newark	642	61.7%
306	UA1805	DEN → HNL Denver to Honolulu	641	66.7%
307	UA721	BOS → IAD Boston to Washington	641	74.1%
308	UA2411	DEN → BUR Denver to Burbank	640	70.7%
309	UA1213	EWR → MCO Newark to Orlando	639	73.5%
310	UA1155	EWR → AUS Newark to Austin	636	79.8%
311	UA491	IAH → MSY Houston to New Orleans	635	90.9%
312	UA1833	BOS → EWR Boston to Newark	635	93.2%
313	UA1739	EWR → MCO Newark to Orlando	633	79.3%
314	UA1327	ATL → DEN Atlanta to Denver	628	88.1%
315	UA1565	DEN → DFW Denver to Dallas–Fort Worth	624	67.7%
316	UA679	CLE → LAX Cleveland to Los Angeles	624	89.3%
317	UA1812	DEN → SFO Denver to San Francisco	624	79.2%
318	UA496	IAH → MCO Houston to Orlando	622	78.1%
319	UA2191	EWR → LAX Newark to Los Angeles	620	74.9%
320	UA413	MCO → IAD Orlando to Washington	620	74.6%
321	UA1829	DEN → IAH Denver to Houston	620	72.2%
322	UA2664	SFO → BWI San Francisco to Baltimore	619	89.1%
323	UA2120	EWR → DEN Newark to Denver	618	77.3%
324	UA404	IAH → EWR Houston to Newark	615	68.7%
325	UA2662	IAH → MCO Houston to Orlando	611	84.6%
326	UA1963	DEN → SLC Denver to Salt Lake City	611	77.8%
327	UA1942	DEN → AUS Denver to Austin	610	70.3%
328	UA2076	DEN → MSP Denver to Minneapolis	607	70.8%
329	UA2344	AUS → IAD Austin to Washington	606	89.8%
330	UA308	PHL → ORD Philadelphia to Chicago	604	64.3%
331	UA1337	DEN → PDX Denver to Portland	603	82.7%
332	UA1997	IAD → EWR Washington to Newark	601	63.8%

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · A flight number is a slot in a schedule and gets reassigned to different city pairs over time, so each is measured only on the route it currently operates. Numbers with fewer than 600 operations on that route, or last flown more than a quarter ago, are not listed. Schedules change — confirm a departure still operates before booking around it.

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Analysis last recomputed September 15, 2026