United Flight 678 Deals & Information (2026/2027)

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United Flight 678 Route Deals From $273

The cheapest prices found with in the last 7 days for return flights were $259 and $273 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Apr 30 - Tue, May 5
MFE
Miller Intl.
IAH
George Bush Intercontinental
$259 Roundtrip, found 3 days ago
$259
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Miller Intl. to George Bush Intercontinental, returning Tue, May 5, priced at $259 found 3 days ago
Sat, May 9 - Sat, May 16
MFE
Miller Intl.
IAH
George Bush Intercontinental
$264 Roundtrip, found 5 days ago
$264
Roundtrip
found 5 days ago
Select United flight, departing Sat, May 9 from Miller Intl. to George Bush Intercontinental, returning Sat, May 16, priced at $264 found 5 days ago
Thu, Jun 25 - Sun, Jun 28
MFE
Miller Intl.
IAH
George Bush Intercontinental
$271 Roundtrip, found 4 days ago
$271
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jun 25 from Miller Intl. to George Bush Intercontinental, returning Sun, Jun 28, priced at $271 found 4 days ago
Thu, Jun 25 - Sun, Jun 28
MFE
Miller Intl.
IAH
George Bush Intercontinental
$274 Roundtrip, found 4 days ago
$274
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jun 25 from Miller Intl. to George Bush Intercontinental, returning Sun, Jun 28, priced at $274 found 4 days ago
Sat, May 9 - Sat, May 16
MFE
Miller Intl.
IAH
George Bush Intercontinental
$277 Roundtrip, found 5 days ago
$277
Roundtrip
found 5 days ago
Select United flight, departing Sat, May 9 from Miller Intl. to George Bush Intercontinental, returning Sat, May 16, priced at $277 found 5 days ago
Thu, Jun 25 - Sun, Jun 28
MFE
Miller Intl.
IAH
George Bush Intercontinental
$286 Roundtrip, found 4 days ago
$286
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jun 25 from Miller Intl. to George Bush Intercontinental, returning Sun, Jun 28, priced at $286 found 4 days ago
Thu, Apr 30 - Tue, May 5
MFE
Miller Intl.
IAH
George Bush Intercontinental
$289 Roundtrip, found 3 days ago
$289
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Miller Intl. to George Bush Intercontinental, returning Tue, May 5, priced at $289 found 3 days ago
Thu, Jun 25 - Sun, Jun 28
MFE
Miller Intl.
IAH
George Bush Intercontinental
$289 Roundtrip, found 4 days ago
$289
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jun 25 from Miller Intl. to George Bush Intercontinental, returning Sun, Jun 28, priced at $289 found 4 days ago
Thu, Apr 30 - Tue, May 5
MFE
Miller Intl.
IAH
George Bush Intercontinental
$291 Roundtrip, found 3 days ago
$291
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Miller Intl. to George Bush Intercontinental, returning Tue, May 5, priced at $291 found 3 days ago
Tue, Sep 1 - Sun, Sep 13
MFE
Miller Intl.
IAH
George Bush Intercontinental
$299 Roundtrip, found 4 days ago
$299
Roundtrip
found 4 days ago
Select United flight, departing Tue, Sep 1 from Miller Intl. to George Bush Intercontinental, returning Sun, Sep 13, priced at $299 found 4 days ago
Sat, May 9 - Sat, May 16
MFE
Miller Intl.
IAH
George Bush Intercontinental
$305 Roundtrip, found 5 days ago
$305
Roundtrip
found 5 days ago
Select United flight, departing Sat, May 9 from Miller Intl. to George Bush Intercontinental, returning Sat, May 16, priced at $305 found 5 days ago
Fri, Apr 24 - Mon, Apr 27
MFE
Miller Intl.
IAH
George Bush Intercontinental
$317 Roundtrip, found 6 days ago
$317
Roundtrip
found 6 days ago
Select United flight, departing Fri, Apr 24 from Miller Intl. to George Bush Intercontinental, returning Mon, Apr 27, priced at $317 found 6 days ago
Thu, Apr 30 - Tue, May 5
MFE
Miller Intl.
IAH
George Bush Intercontinental
$321 Roundtrip, found 3 days ago
$321
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Miller Intl. to George Bush Intercontinental, returning Tue, May 5, priced at $321 found 3 days ago
Tue, Sep 1 - Sun, Sep 13
MFE
Miller Intl.
IAH
George Bush Intercontinental
$329 Roundtrip, found 4 days ago
$329
Roundtrip
found 4 days ago
Select United flight, departing Tue, Sep 1 from Miller Intl. to George Bush Intercontinental, returning Sun, Sep 13, priced at $329 found 4 days ago
Thu, Apr 30 - Tue, May 5
MFE
Miller Intl.
IAH
George Bush Intercontinental
$331 Roundtrip, found 3 days ago
$331
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 30 from Miller Intl. to George Bush Intercontinental, returning Tue, May 5, priced at $331 found 3 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.