United Flight 678 Deals & Information (2026/2027)

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United Flight 678 Route Deals From $277

The cheapest prices found with in the last 7 days for return flights were $239 and $277 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Oct 16 - Sun, Oct 18
MFE
Miller Intl.
IAH
George Bush Intercontinental
$239 Roundtrip, found 4 days ago
$239
Roundtrip
found 4 days ago
Select United flight, departing Fri, Oct 16 from Miller Intl. to George Bush Intercontinental, returning Sun, Oct 18, priced at $239 found 4 days ago
Fri, May 29 - Sun, May 31
MFE
Miller Intl.
IAH
George Bush Intercontinental
$245 Roundtrip, found 1 day ago
$245
Roundtrip
found 1 day ago
Select United flight, departing Fri, May 29 from Miller Intl. to George Bush Intercontinental, returning Sun, May 31, priced at $245 found 1 day ago
Fri, Oct 16 - Sun, Oct 18
MFE
Miller Intl.
IAH
George Bush Intercontinental
$252 Roundtrip, found 4 days ago
$252
Roundtrip
found 4 days ago
Select United flight, departing Fri, Oct 16 from Miller Intl. to George Bush Intercontinental, returning Sun, Oct 18, priced at $252 found 4 days ago
Fri, May 29 - Sun, May 31
MFE
Miller Intl.
IAH
George Bush Intercontinental
$258 Roundtrip, found 1 day ago
$258
Roundtrip
found 1 day ago
Select United flight, departing Fri, May 29 from Miller Intl. to George Bush Intercontinental, returning Sun, May 31, priced at $258 found 1 day ago
Fri, Oct 16 - Sun, Oct 18
MFE
Miller Intl.
IAH
George Bush Intercontinental
$274 Roundtrip, found 4 days ago
$274
Roundtrip
found 4 days ago
Select United flight, departing Fri, Oct 16 from Miller Intl. to George Bush Intercontinental, returning Sun, Oct 18, priced at $274 found 4 days ago
Fri, May 29 - Sun, May 31
MFE
Miller Intl.
IAH
George Bush Intercontinental
$281 Roundtrip, found 1 day ago
$281
Roundtrip
found 1 day ago
Select United flight, departing Fri, May 29 from Miller Intl. to George Bush Intercontinental, returning Sun, May 31, priced at $281 found 1 day ago
Fri, Oct 16 - Sun, Oct 18
MFE
Miller Intl.
IAH
George Bush Intercontinental
$287 Roundtrip, found 4 days ago
$287
Roundtrip
found 4 days ago
Select United flight, departing Fri, Oct 16 from Miller Intl. to George Bush Intercontinental, returning Sun, Oct 18, priced at $287 found 4 days ago
Wed, May 20 - Sun, May 24
MFE
Miller Intl.
IAH
George Bush Intercontinental
$291 Roundtrip, found 1 day ago
$291
Roundtrip
found 1 day ago
Select United flight, departing Wed, May 20 from Miller Intl. to George Bush Intercontinental, returning Sun, May 24, priced at $291 found 1 day ago
Fri, May 29 - Sun, May 31
MFE
Miller Intl.
IAH
George Bush Intercontinental
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select United flight, departing Fri, May 29 from Miller Intl. to George Bush Intercontinental, returning Sun, May 31, priced at $294 found 1 day ago
Thu, May 14 - Mon, May 18
MFE
Miller Intl.
IAH
George Bush Intercontinental
$305 Roundtrip, found 2 days ago
$305
Roundtrip
found 2 days ago
Select United flight, departing Thu, May 14 from Miller Intl. to George Bush Intercontinental, returning Mon, May 18, priced at $305 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.