United Flight 678 Deals & Information (2026/2027)

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United Flight 678 Route Deals From $251

The cheapest prices found with in the last 7 days for return flights were $239 and $251 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$239 Roundtrip, found 2 days ago
$239
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $239 found 2 days ago
Mon, May 18 - Tue, May 26
MFE
Miller Intl.
IAH
George Bush Intercontinental
$250 Roundtrip, found 10 hours ago
$250
Roundtrip
found 10 hours ago
Select United flight, departing Mon, May 18 from Miller Intl. to George Bush Intercontinental, returning Tue, May 26, priced at $250 found 10 hours ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$259 Roundtrip, found 2 days ago
$259
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $259 found 2 days ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$263 Roundtrip, found 2 days ago
$263
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $263 found 2 days ago
Mon, Apr 6 - Mon, Apr 13
MFE
Miller Intl.
IAH
George Bush Intercontinental
$265 Roundtrip, found 6 days ago
$265
Roundtrip
found 6 days ago
Select United flight, departing Mon, Apr 6 from Miller Intl. to George Bush Intercontinental, returning Mon, Apr 13, priced at $265 found 6 days ago
Thu, Apr 23 - Tue, Apr 28
MFE
Miller Intl.
IAH
George Bush Intercontinental
$268 Roundtrip, found 1 day ago
$268
Roundtrip
found 1 day ago
Select United flight, departing Thu, Apr 23 from Miller Intl. to George Bush Intercontinental, returning Tue, Apr 28, priced at $268 found 1 day ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$268 Roundtrip, found 2 days ago
$268
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $268 found 2 days ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$275 Roundtrip, found 2 days ago
$275
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $275 found 2 days ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$276 Roundtrip, found 2 days ago
$276
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $276 found 2 days ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$282 Roundtrip, found 2 days ago
$282
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $282 found 2 days ago
Sat, Apr 11 - Sun, Apr 12
MFE
Miller Intl.
IAH
George Bush Intercontinental
$284 Roundtrip, found 4 days ago
$284
Roundtrip
found 4 days ago
Select United flight, departing Sat, Apr 11 from Miller Intl. to George Bush Intercontinental, returning Sun, Apr 12, priced at $284 found 4 days ago
Tue, Nov 3 - Sat, Nov 7
MFE
Miller Intl.
IAH
George Bush Intercontinental
$288 Roundtrip, found 2 days ago
$288
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 3 from Miller Intl. to George Bush Intercontinental, returning Sat, Nov 7, priced at $288 found 2 days ago

Frequently asked questions

What route does flight number UA678 take?
Flight number UA678 operates directly from Washington, DC Airport (IAD-Washington Dulles Intl.) to MIA. During this trip, you'll be in the air for 2 hours and 40 minutes. Consider booking ahead to secure your favorite seat.
What kind of plane is on flight number UA678?
The route for UA678 is generally Washington, DC Airport (IAD-Washington Dulles Intl.) to MIA, and the Airbus A319 is the type of aircraft you'll probably be heading off on.
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 UA678 flight with Travelocity, please visit our Customer Service Portal.