United Flight 720 Deals & Information (2026/2027)

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United Flight 720 Route Deals From $221

The cheapest prices found with in the last 7 days for return flights were $302 and $221 for one-way flights to Calgary Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Aug 4 - Mon, Aug 10
DEN
Denver Intl.
YYC
Calgary Intl.
$302 Roundtrip, found 16 hours ago
$302
Roundtrip
found 16 hours ago
Select United flight, departing Tue, Aug 4 from Denver Intl. to Calgary Intl., returning Mon, Aug 10, priced at $302 found 16 hours ago
Sat, Jun 27 - Mon, Jul 6
DEN
Denver Intl.
YYC
Calgary Intl.
$329 Roundtrip, found 6 days ago
$329
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jun 27 from Denver Intl. to Calgary Intl., returning Mon, Jul 6, priced at $329 found 6 days ago
Tue, Sep 1 - Sun, Sep 6
DEN
Denver Intl.
YYC
Calgary Intl.
$352 Roundtrip, found 1 day ago
$352
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 1 from Denver Intl. to Calgary Intl., returning Sun, Sep 6, priced at $352 found 1 day ago
Tue, Aug 4 - Mon, Aug 10
DEN
Denver Intl.
YYC
Calgary Intl.
$359 Roundtrip, found 16 hours ago
$359
Roundtrip
found 16 hours ago
Select United flight, departing Tue, Aug 4 from Denver Intl. to Calgary Intl., returning Mon, Aug 10, priced at $359 found 16 hours ago
Fri, Aug 7 - Sun, Aug 16
DEN
Denver Intl.
YYC
Calgary Intl.
$360 Roundtrip, found 1 day ago
$360
Roundtrip
found 1 day ago
Select United flight, departing Fri, Aug 7 from Denver Intl. to Calgary Intl., returning Sun, Aug 16, priced at $360 found 1 day ago

Frequently asked questions

What route does flight number UA720 take?
You'll be landing at DIA airport from San Francisco, CA Airport (SFO-San Francisco Intl.) if you're traveling on flight number UA720. You'll be airborne for 2 hours and 35 minutes on this trip. What's more, the flight conveniently operates non-stop.
What terminal does UA720 fly out of?
You'll likely be departing from Terminal 3 if you're traveling on flight number UA720 direct from San Francisco Intl. Airport (SFO) to DEN.
What kind of plane is on flight number UA720?
The Boeing 737-800 is the kind of plane that's mostly used for flight number UA720. Typically, this flight takes off from SFO and comes in to land at DIA airport.
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 UA720 flight with Travelocity, please visit our Customer Service Portal.