United Flight 1521 Deals & Information (2025/2026)

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United Flight 1521 Route Deals From $111

The cheapest prices found with in the last 7 days for return flights were $167 and $111 for one-way flights to Hopkins Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Aug 16 - Wed, Aug 20
DEN
Denver Intl.
CLE
Hopkins Intl.
$167 Roundtrip, found 4 days ago
$167
Roundtrip
found 4 days ago
Select United flight, departing Sat, Aug 16 from Denver Intl. to Hopkins Intl., returning Wed, Aug 20, priced at $167 found 4 days ago

Frequently asked questions

What route does flight number UA1521 take?
UA1521 jets between IAD and CLE directly. This trip takes 1 hour and 14 minutes.
How often is UA1521 on time?
United Airlines flight number UA1521 between IAD and Hopkins Intl. Airport (CLE) runs on schedule 91% of the time --- so you can relax knowing that you will reach your destination ASAP. If your service is delayed, you're likely to wait approximately 44 minutes. This route has a star rating of 2.75.
What kind of plane is on flight number UA1521?
Get set to cruise the skies aboard a Boeing 737-800 if your flight number is UA1521. Almost all flights from Dulles Intl. Airport to CLE use this aircraft type.
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 UA1521 flight with Travelocity, please visit our Customer Service Portal.