United Flight 1515 Deals & Information (2026/2027)

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United Flight 1515 Route Deals From $258

The cheapest prices found with in the last 7 days for return flights were $269 and $258 for one-way flights to Great Falls Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Oct 27 - Mon, Nov 2
DEN
Denver Intl.
GTF
Great Falls Intl.
$269 Roundtrip, found 2 days ago
$269
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 27 from Denver Intl. to Great Falls Intl., returning Mon, Nov 2, priced at $269 found 2 days ago
Sun, Sep 27 - Sat, Oct 3
DEN
Denver Intl.
GTF
Great Falls Intl.
$293 Roundtrip, found 7 hours ago
$293
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Sep 27 from Denver Intl. to Great Falls Intl., returning Sat, Oct 3, priced at $293 found 7 hours ago
Sat, Sep 12 - Sat, Sep 19
DEN
Denver Intl.
GTF
Great Falls Intl.
$312 Roundtrip, found 3 days ago
$312
Roundtrip
found 3 days ago
Select United flight, departing Sat, Sep 12 from Denver Intl. to Great Falls Intl., returning Sat, Sep 19, priced at $312 found 3 days ago
Fri, Sep 4 - Sat, Sep 5
DEN
Denver Intl.
GTF
Great Falls Intl.
$330 Roundtrip, found 5 days ago
$330
Roundtrip
found 5 days ago
Select United flight, departing Fri, Sep 4 from Denver Intl. to Great Falls Intl., returning Sat, Sep 5, priced at $330 found 5 days ago
Fri, Sep 4 - Mon, Sep 7
DEN
Denver Intl.
GTF
Great Falls Intl.
$348 Roundtrip, found 3 days ago
$348
Roundtrip
found 3 days ago
Select United flight, departing Fri, Sep 4 from Denver Intl. to Great Falls Intl., returning Mon, Sep 7, priced at $348 found 3 days ago
Wed, Sep 16 - Sat, Sep 19
DEN
Denver Intl.
GTF
Great Falls Intl.
$364 Roundtrip, found 1 day ago
$364
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 16 from Denver Intl. to Great Falls Intl., returning Sat, Sep 19, priced at $364 found 1 day ago
Sun, Sep 27 - Sat, Oct 3
DEN
Denver Intl.
GTF
Great Falls Intl.
$379 Roundtrip, found 7 hours ago
$379
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Sep 27 from Denver Intl. to Great Falls Intl., returning Sat, Oct 3, priced at $379 found 7 hours ago
Sat, Sep 12 - Sat, Sep 19
DEN
Denver Intl.
GTF
Great Falls Intl.
$393 Roundtrip, found 3 days ago
$393
Roundtrip
found 3 days ago
Select United flight, departing Sat, Sep 12 from Denver Intl. to Great Falls Intl., returning Sat, Sep 19, priced at $393 found 3 days ago
Thu, Sep 3 - Mon, Sep 7
DEN
Denver Intl.
GTF
Great Falls Intl.
$403 Roundtrip, found 7 hours ago
$403
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Sep 3 from Denver Intl. to Great Falls Intl., returning Mon, Sep 7, priced at $403 found 7 hours ago
Fri, Sep 4 - Sat, Sep 5
DEN
Denver Intl.
GTF
Great Falls Intl.
$411 Roundtrip, found 5 days ago
$411
Roundtrip
found 5 days ago
Select United flight, departing Fri, Sep 4 from Denver Intl. to Great Falls Intl., returning Sat, Sep 5, priced at $411 found 5 days ago
Sat, Oct 10 - Sun, Oct 11
DEN
Denver Intl.
GTF
Great Falls Intl.
$445 Roundtrip, found 1 day ago
$445
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 10 from Denver Intl. to Great Falls Intl., returning Sun, Oct 11, priced at $445 found 1 day ago
Wed, Sep 16 - Sat, Sep 19
DEN
Denver Intl.
GTF
Great Falls Intl.
$445 Roundtrip, found 1 day ago
$445
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 16 from Denver Intl. to Great Falls Intl., returning Sat, Sep 19, priced at $445 found 1 day ago
Thu, Sep 3 - Wed, Sep 9
DEN
Denver Intl.
GTF
Great Falls Intl.
$447 Roundtrip, found 1 day ago
$447
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 3 from Denver Intl. to Great Falls Intl., returning Wed, Sep 9, priced at $447 found 1 day ago
Sun, Sep 27 - Sat, Oct 3
DEN
Denver Intl.
GTF
Great Falls Intl.
$460 Roundtrip, found 7 hours ago
$460
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Sep 27 from Denver Intl. to Great Falls Intl., returning Sat, Oct 3, priced at $460 found 7 hours ago
Thu, Sep 3 - Mon, Sep 7
DEN
Denver Intl.
GTF
Great Falls Intl.
$484 Roundtrip, found 7 hours ago
$484
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Sep 3 from Denver Intl. to Great Falls Intl., returning Mon, Sep 7, priced at $484 found 7 hours ago
Thu, Sep 3 - Mon, Sep 7
DEN
Denver Intl.
GTF
Great Falls Intl.
$565 Roundtrip, found 7 hours ago
$565
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Sep 3 from Denver Intl. to Great Falls Intl., returning Mon, Sep 7, priced at $565 found 7 hours ago
Sun, Sep 27 - Sat, Oct 3
DEN
Denver Intl.
GTF
Great Falls Intl.
$575 Roundtrip, found 7 hours ago
$575
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Sep 27 from Denver Intl. to Great Falls Intl., returning Sat, Oct 3, priced at $575 found 7 hours ago

Frequently asked questions

What route does flight number UA1515 take?
UA1515 jets between IAH and Denver, CO Airport (DEN-Denver Intl.) and flies direct. This journey usually takes 2 hours and 34 minutes.
What terminal does UA1515 fly out of?
You'll likely be boarding the plane from Terminal C if you're flying on UA1515 direct from George Bush Intercontinental Airport (IAH) to Denver, CO Airport (DEN-Denver Intl.).
What kind of plane is on flight number UA1515?
There's a strong chance you'll find yourself stepping on board a Boeing 767-300 if you're on flight UA1515. This flight usually takes off from Houston, TX Airport (IAH-George Bush Intercontinental) and arrives at DEN.
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 UA1515 flight with Travelocity, please visit our Customer Service Portal.