United Flight 421 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 421 Route Deals From $129

The cheapest prices found with in the last 7 days for return flights were $257 and $129 for one-way flights to General Mitchell Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Aug 16 - Mon, Aug 18
DEN
Denver Intl.
MKE
General Mitchell Intl.
$257 Roundtrip, found 2 hours ago
$257
Roundtrip
found 2 hours ago
Select United flight, departing Sat, Aug 16 from Denver Intl. to General Mitchell Intl., returning Mon, Aug 18, priced at $257 found 2 hours ago
Tue, Jul 8 - Sat, Jul 12
DEN
Denver Intl.
MKE
General Mitchell Intl.
$262 Roundtrip, just found
$262
Roundtrip
just found
Select United flight, departing Tue, Jul 8 from Denver Intl. to General Mitchell Intl., returning Sat, Jul 12, priced at $262 just found
Sat, Aug 16 - Mon, Aug 18
DEN
Denver Intl.
MKE
General Mitchell Intl.
$265 Roundtrip, found 2 hours ago
$265
Roundtrip
found 2 hours ago
Select United flight, departing Sat, Aug 16 from Denver Intl. to General Mitchell Intl., returning Mon, Aug 18, priced at $265 found 2 hours ago

Frequently asked questions

What route does flight number UA421 take?
You’ll arrive into Newark, NJ Airport (EWR-Liberty Intl.) from Los Angeles Intl. Airport (LAX) if you’ve booked a ticket on flight number UA421. You’ll be in the air for 5 hours and 14 minutes during this trip. It’s also good to note that the flight conveniently travels direct.
What terminal does UA421 fly out of?
Flight number UA421 runs between Los Angeles, CA Airport (LAX-Los Angeles Intl.) and Newark Airport, and travelers on this flight commonly depart from Terminal 7.
What kind of plane is on flight number UA421?
The Boeing 757-200 is the kind of plane usually used for flight UA421. This flight typically heads off from LAX and arrives at Newark, NJ Airport (EWR-Liberty Intl.).
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA421 flight with Travelocity, please visit our Customer Service Portal.